August 2002

Ken's musings

Looking for a Heat Escape and to add dollars to your bottom line? AU Hort on Display is the place to be on September 3-5. It is not often you get an invitation to the AU Horticulture Greenhouses and Nursery. In fact, it has been at least 13 years or since I have been at Auburn. We have been a little embarrassed to have anyone see our antiquated facilities. But, thanks to you and others, we have some new facilities that have given us a good start toward our future. We want you to join us for education, nursery and greenhouse tours, golf and sporting clays and time to see old friends. Please read the program below and take part in some or all of our activities. I hope it becomes a tradition at Auburn.

SNA Trade Show and Research Conference blasted by in a blur with its usual flawless orchestration of events. We have a few of the papers highlighted below. I have some other papers requested from the researchers that I thought would be helpful to you and I will get them summarized for the next newsletter.

I also want to remind you of our joint meeting of the International Plant Propagators’ Society. The Southern and Eastern Regions are combining to have the joint meetings September 29 to October 2, 2002. This program is listed below too. I have often said that aside from your local, state, and regional nursery associations, if there was an association that you could not live without and be in the nursery business, it is IPPS. It is a grower association sharing-all with each other. There is a sprinkling of university types but it is predominantly a grower organized society. It is also a well run association. It is one of the few associations I know of where people volunteer enthusiastically to be involved in various committees. If you have not been, you need to come see what you are missing. Great education and great tours are waiting for you! These are not just get-a-ways. These programs mean real dollars for your business. There is a new web site at that will answer your questions or you can call or email us for more help.

The last thing I want to leave you with is AU HORT ON DISPLAY - Please accept our invitation!!!!


DISCLAIMER: Please remember that all information presented is a summary of research and not an endorsement of any product or a recommendation of chemicals. The official labels from the manufacturing companies offer the legal and proper use and handling information for all products.

The following articles are featured in this month's Something to Grow On:













September 3-5, 2002

Join us in celebrating the opening of our new and renovated greenhouse facilities.
Participate in an overview of our research projects and
relax with friends at golf or sporting clays and join us on a nursery tour.

And on September 4 at 11:00 a.m.
You are cordially invited to the

Ribbon cutting ceremony

and dedication of the new and renovated Paterson Greenhouse Complex
on the campus of Auburn University.

If you need to book a hotel room call the AU Hotel and Conference Center, centrally located three miles from Interstate 85, across the street from the Auburn University campus at 241 South College Street, Auburn, AL 36830. (fax: 334-826-8755; phone: 334-844-4718 or 1-800-2AUBURN

SPECIAL EVENTS - Tuesday, September 3, 2002

GOLF at the Grand National Golf Club, Opelika, AL

Starting at 10:30 a.m. enjoy 18 holes of championship caliber golf with friends (old and new) at Grand National Golf Club. $65 includes greens fees, cart, and lunch at the turn. Call for detailed directions (334-749-9011).

SPORTING CLAYS at White Oak Plantation, Tuskegee, AL
Starting at 10:30 a.m. you can sharpen your shooting skills and enjoy great food and fellowship, too. $65 gets you lots of shooting and White Oak Plantation’s renowned home cooking.

Call for detailed directions (334-727-9258).

NURSERY TOUR AND DINNER at Moore and Davis Nursery, Shorter, AL
Everyone is invited to tour Moore and Davis Nursery. Festivities kick off at 5 p.m. A complimentary dinner will be provided. From Auburn take I-85S to Exit 22. Turn left onto highway 80E (towards Tuskegee). The nursery is 3.5 miles on the left. phone: 334-201-2500; 1-877-423-7500 (toll free) address: 13804 US Hwy. 80 West

Wednesday, September 4, 2002

NOTE: Please keep your vehicles parked at the AU Hotel and Conference Center as there is no available parking at the Greenhouses. We will have shuttle buses available for your convenience.

Dr. David Williams, Moderator
8:00-9:00 Register at the AU Hotel and Conference Center
9:00-9:10 Welcome and Program Note: Dr. David Williams
9:10-9:40 Resources for the Landscape Professional: Dr. Joe Eakes
9:40-10:00 Walk or take a shuttle to the Paterson Greenhouse Complex
10:00-11:00 Tour of renovated and new facilities
11:00-11:30 Ribbon cutting ceremony
11:30-1:00 Lunch at the Greenhouses; Return to AU Hotel and Conference Center
1:00-1:30 Difficult to Transplant Woody Ornamentals: Getting to the Root of the Problem: Dr. Amy Wright
1:30-2:00 Low Temperature Evaluations of Landscape Plants:
Dr. Doug Findley
2:00-2:45 Landscape Doctor: A Diagnostic Refresher: Dr. Harry Ponder
2:45-3:00 Break
3:00-3:30 The Industry/Academic Connection: Dale Elkins, Region Manager, TrueGreen LandCare
3:30-4:00 Building the Better Butterfly Buffet - Laura Bruner
4:00-4:30 Deer Control Strategies: Jennifer Walker
5:30-6:00 Reception (AU Hotel and Conference Center)
6:00 Dinner

Dr. Ken Tilt, Moderator
8:00-8:45Register and park at the AU Hotel and Conference Center; walk or take shuttle to Paterson Greenhouse Complex
9:00-10:00 Six stations hosted by AU faculty and students:
1. Overview of stations 1 and 2: Dr. Gary Keever
Pruning Effects on Cold Hardiness in Buddleia: Jennifer Warr
2. Growth Regulation of Woody and Herbaceous Perennials:
Jay Amling
BA-Induced Branching of Indian Hawthorn: Jayme Oates
3. Container Herbicide Demonstration Trials: Dr. Charles Gilliam
4. Semi-Automated Irrigation and Assorted Items of Interest:
Dr. Ken Tilt
5. Satsumas in Alabama: Dr. Bob Ebel
Espalier Production of Apple Trees: Lorie Burtts
6. Hydrangea Pruning and Herbicide Trials: Tabor Conwell
10:00-11:00 Tour of renovated and new facilities
11:00-11:30 Ribbon cutting ceremony
11:30-1:00 Lunch at the Greenhouses Return to AU Hotel and Conference Center
1:00-1:20 Results of Ornamental Plant Trials around the State:
Dr. Austin Hagan
1:20-1:40 Nursery Research Update: Dr. Ed Bush
1:40-2:00 Cyclic Irrigation: The Facts: Dr. Glenn Fain
2:00-2:20 Fall Fertilization for Containers: John Olive
2:20-2:40 Chilling Hours for Woody Ornamentals: Does it Make a Difference:
Dr. Jeff Sibley
2:40-3:00 Break
3:00-3:20 Five Points to Remember when Growing Trees in Containers:
Dr. Donna Fare
3:20-3:40 LSU AgCenter Landscape Plant Evaluation: Dr. Allen Owings
3:40-4:00 Nursery Research from Poplarville, MS: Dr. Patricia Knight
4:00-4:20 Pursell Technology, Partnering in Research and Education:
John Johnson
4:20-4:40 Propagation: Attention to Details Gene Blythe
5:30-6:00 Reception (AU Hotel and Conference Center)
6:00 Dinner

Thursday, September 5, 2002

Dr. Raymond Kessler, Moderator
8:00-9:00 Register at AU Hotel and Conference Center and then proceed on foot or shuttle bus to the Paterson Greenhouse Complex
9:00-9:45 Pesticide Storage and Safety: Dr. Wheeler Foshee
9:45-10:30 Boston Fern Production: Chazz Hesselein
10:30-12:00 Greenhouse Tour
12:00-1:00 Lunch at Greenhouses; return to AU Hotel and Conference Center
1:00-1:45 Insect Identification, How to Save Your Money: Brian McCaffrey
1:45-2:30 Fertilizing Greenhouse Crops: Dr. Raymond Kessler
2:30-2:45 Break
2:45-3:30 Poinsettia Production, One Grower’s Perspective: John Nelson
3:30-4:15 Greenhouse Diseases: Dr. Austin Hagan


(To register you can download this form. Mail by AUGUST 25)

Tuesday, September 3
Golf Outing at Grand National
To help with pairings please indicate your golf scoring category or handicap
_____ 75 and under
_____ 76-85
_____ 86-95
_____ over 95
_____ handicap

_____people at $65 per person $ _____

Tuesday, September 3
Sporting Clays at White Oak Plantation
_____ people at $65 per person $ _____

Tuesday, September 3
Tour and Dinner at Moore and Davis Nursery
No fee
_____ people
Wednesday, September 4
Nursery Education Program
_____ people @ $50 per person $ _____
Wednesday, September 4
Landscape Education Program _____ people @ $50 per person $ _____
Thursday, September 5
Greenhouse Education Program _____ people @ $50 per person $_____
Wednesday and Thursday, September 4 and 5
Two-Day Educational Program
Choice of Landscape OR Nursery AND Greenhouse. Please indicate choice:
_____ Landscape
_____ Nursery
_____ people @ $75 per person $ _____
Wednesday, September 4
Reception and Dinner AU Hotel and Conference Center
_____ people @ $27 per person $ _____
Please make checks payable to
and mail to:
Alabama Nurserymen’s Association

P.O. Box 9
Auburn, AL 36831-0009
phone: 334-821-5148
company name:
Please indicate below whether you have any dietary restrictions or access
limitations so that we may assist you:

AU Horticulture Department website:
AU Landscape/Horticulture website:


The International Plant Propagators' Society, Eastern and Southern Regions Joint Annual Meeting Program, "Looking Towards the Future from a Successful Past" will be held on September 29 - October 2, 2002 at the Marriott Hunt Valley Inn, Baltimore, Maryland. Some of the many sessions are as follows:

The History and Impact of the United States Government in New Plant Research
Drought Tolerant Native Herbaceous Perennials
Propagation of Ornamental Grasses
A Grower's Solution to Nutrient and Water Management
Use of Waste and Compost in Propagation: Challenges & Constraints
Propagating Hydrangeas Year-Round
Tissue Culture of Trilliums
Ground Cover Production on Plastic Mulch
Rooting vs. Grafting of Shade, Flowering and Fruit Trees
The Feasibility of Utilizing Tobacco Greenhouses as Propagation Facilities for Ornamental Plants
Live Oak Propagation
Air Layering - A Rooting Alternative
Perennial Production at Flowerwood Nursery
Integrating Web Technology with Traditional Teaching of Plant Propagation
Propagating Aquatic Plants
Propagation of Oak Liners
Production of Unique Cultivars Through Budding, Grafting and Seed
Green Roof Technology
Plants from Asia
Horticulture of South Africa

In addition to the oral and poster presentations there will also be nursery tours and a silent auction. For more information email Ken Tilt (


Buddleia davidii 'Royal Red' (butterfly bush) is a woody shrub with rich purple, fragrant flowers in long panicles known to attract butterflies and bees. Butterfly bush grows as an arching shrub and blooms on new wood and is used in perennial borders, butterfly gardens or in mass shrub plantings. This shrub grows profusely throughout the summer and can become unkempt late in the season in the landscape. Growers also find it necessary to prune butterfly bush throughout the growing season to maintain compactness for shipping, as a source of cuttings or to save valuable space for overwintering.

This study was conducted at Auburn University to determine how time of pruning affects cold hardiness in Buddleia davidii 'Royal Red'. The results of the study demonstrate that pruning buddleia before the plants have become fully dormant in the Fall increases the chance for winter injury resulting in death. Growers and homeowners alike should prune late in winter or early spring to decrease the chance of cold injury.

(from a student research paper presented at SNA 2002 by Jennifer Warr, Gary Keever, Doug Findley, and Raymond Kessler, Auburn University, Department of Horticulture).


Ginkgo biloba is an ornamental tree of prominence and value in the green industry. Often referred to as a ‘living fossil’, ginkgo grows well in USDA Hardiness Zones 3 through 9 , reaching a mature height up to 80’ and width of 40’. With a slow to medium growth habit, trees are often pyramidal when young and become wide spreading when older. Ginkgo is insect and disease resistant making it an excellent choice for a city tree with over 40 cultivars available. Though much work has been done with fruit species with respect to dormancy and chilling requirements, no work has been reported regarding chilling requirements with G. biloba. Chilling units are generally based on the number of hours accumulated below 45°F. The objectives of this study were to determine chilling and dormancy requirements for this species in order to increase production efficiency.

Increasing the number of chill hours led to a decreased amount of time required inside the greenhouse to reach 50% foliar budbreak. In most cases, increased chilling produced a higher percent foliar budbreak. Budbreak percent increased with the increase of approximately 1000 chill hours. Trees that were in the cooler for an extended period of time were able to reach the point of 50% foliar budbreak with less accumulated time inside the greenhouse. This was evident with trees receiving 800 - 1100 chill hours when compared to all other treatments.

Greenhouse growers

Increased chilling led to a decreased heat requirement to initiate budbreak. For growers producing G. biloba liners in greenhouses, adjusting environmental conditions to allow chilling can accelerate and lead to more efficient production for container grown G. biloba. As for field or outdoor production, while it is possible to produce G. biloba in USDA Hardiness Zones 3 through 9, our work indicates trees may reach a profitable size more rapidly in regions that accumulate greater than 800 hours of chilling.

(from student research paper presented at SNA by Jeffrey C. Wilson, Jeff L. Sibley, James E. Altland, Ken M. Tilt, and Wheeler G. Foshee, III, Department of Horticulture, Auburn University.)


Potential use of composts and other organic materials in the horticultural industry are frequently evaluated. With availability and cost of materials like pine bark (PB) and peat (P) regulated by the timber industry or environmental regulations, supply can be inconsistent or unpredictable. The introduction of alternative products as substrates in the area of container and greenhouse production and propagation are evermore urgent. Transportation costs, consistency of product, disease and insect infestation, and availability of the compost are problemmatic.

Composted cotton gin waste (CGC) is a prospective substrate component. Cost effectiveness and the legality of the disposal of this cotton byproduct are current impediments to its widespread use. Cotton gin waste (CGW) is a term used to describe the byproducts of the cotton ginning process that includes leaves, stems, burrs, and some fiber. The end result of composting CGW is a fine, dark topsoil-like product.

CGC is a viable substrate for use in the production of greenhouse crops and in propagation. All blends of PB and CGC were equivalent or better than the industry standard. CGC can be used as a partial substitute for PB in greenhouse production of weeping figs, poinsettias and roses as well as a substrate for propagation of coleus. CGC is prevalent throughout the Southeast U.S. and availability is not a concern. The burden of disposal costs can be decreased from cotton ginning operations while at the same time possibly decreasing production costs for nurseries.

(from a student research paper presented at SNA 2002 by David M. Cole, Jeff L. Sibley, Eugene K. Blythe, D. Joseph Eakes, and Ken M. Tilt, Horticulture Department, Auburn University.)


The markets for nursery crops demand weed free container grown plants. Using labor for weeding is expensive. Growers have been forced to search for nontraditional methods to reduce costs. Growers are now willing to accept limited crop injury from herbicides to control weeds if the resultant injury is early in the crop cycle and the crop completely recovers in a short time period. In the past growers demanded that herbicides have broad-spectrum control and crop safety. However, some growers are now interested in herbicides that have tolerance in a few crops or that control a major weed problem, i.e. bittercress, spurge, or oxalis.

A 1990 survey of nurserymen reported that oxalis was one of four weeds that were considered very difficult to control in containers. While preemergence herbicide applications provide adequate control of oxalis, no method is 100 percent effective. Commonly, container-grown plants may have serious infestations of oxalis when emerging from over-wintering and require hand weeding. Therefore, a new method providing postemergence oxalis control would greatly benefit growers.

The objective of this study was to evaluate Direx for postemergent oxalis control and tolerance of two landscape crops: Liriope (Liriope muscari) and camellia (Camellia japonica) to this product.

The data from our studies indicate that Direx (diuron), an herbicide typically used for preemergence weed control in cotton and orchards, can provide good to excellent control of oxalis and is tolerated well by liriope and camellia. Direx is not currently registered for use on landscape crops. However, the manufacturer is seeking registration through the IR-4 program. More research is needed to determine tolerance of other landscape crops to Direx.

Effect of Diuron Rate on Oxalis Control 21 DAT

(from a student research paper presented at SNA 2002 by Carey V. Simpson, Charles H. Gilliam, James E. Altland, Glenn R. Wehtje and Jeff L. Sibley, Horticulture Department, Auburn University.)


Reducing or preventing erosion along river or stream banks requires minimal soil disturbance. One solution to this problem is to use live stakes, woody plant cuttings capable of quickly rooting in this environment. Cuttings need to be able to be tamped down as stakes (3/4 to 2 inches in diamter and 24 to 36 inches long).

This study was conducted to evaluate the influence of IBA (rooting hormone) treatments on the percentage of stakes surviving in this challenging environment and to determine which species would adapt well to this technique. The site was on a streambed at the Mountain Horticultural Crops Research Station in Fletcher, North Carolina. Soil was not tilled or fertilized. Weed or pest management was not implemented during the study.

There was no benefit to treating live stakes with concentrations of IBA used in this test. USDA recommended species Cornus amomum, Salix nigra and Sambucus canadensis all survived at greater than 50%. USDA recommended species Acer negundo did not live. Betula nigra, Physocarpus opulifolius and Platanus occidentalis survived in high percentages and should be added to suggested species lists for the region. Alnus serrulata survived at about 20%.

(from an SNA 2002 paper by R. Bir, J. Calabria, and J. Conner at NC State University).


A good source of information for the greenhouse manager is the Texas Greenhouse Management Handbook. Some of the topics covered are: Greenhouse Structures, Greenhouse Heating Requirements, Growing Media, Diagnosing Nutritional Deficiencies, Managing Soluble Salts.


Held at the Mountain Horticultural Crops Research Station in Fletcher, North Carolina on September 26, this program will feature a number of talks, among them: Introducing 'Summer Cascade' river birch; Screening for fire blight resistance in crabapples, pears, quince, and serviceberries; Landscape plant evaluation trials; A touch and smell herb garden with culinary, medicinal and aromatic herbs; Production of forest botanicals under artificial shade, including bloodroot and black cohosh; Research on crop mazes for agritourism; Turfgrass variety trials; Boxwood, camellia, hydrangea and lilac evaluations for both landscape suitability and production potential.

No preregistration is required. For more information contact Richard Bir at


Jackie Mullen
Extension Plant Pathology Specialist

Much of June was enjoyable with moderate day temperatures in the 80s. Rainfall was sporadic across the state with adequate rain in some areas but some areas (such as Auburn) received less than normal rainfall. Our June plant sample submissions were about normal with 221 plant samples received. Tomato spotted wilt virus on tomato in home gardens was especially common in June. We also saw a few (3) pepper samples with this virus disease. Daylily rust was observed on samples from a southern most, a central, and a northern most area of the state.

Tomato spotted wilt virus has a broad host range, but in the Southeast it is especially common on tomato, pepper, and peanuts. On tomato, the virus causes black or bronze blotches, spots or ring spots. Sometimes a whole leaf or half of the leaf surface is completely black or a bronze color. Newest small leaves may show a yellow or purple netting on the normal green leaf coloration. Fruit may show yellow ring spots. Plants and fruit may be stunted. On peppers and peanuts, the symptoms are not as obvious and dramatic. Stunting is evident. New growth may show yellow spots or ring spots. A yellow mottle may also be apparent on some leaves. With tomatoes and peppers, control recommendations usually involve removal of damaged plants.

Application of an insecticide to control thrips is usually helpful, but insect transmitted viruses are usually difficult to control. See ANR-836.

Daylily rust appears as reddish brown leaf spots on daylily leaves. As the spots age, they will crack open and masses of orange rust spores (uredospores) are evident covering the brown leaf spot area. The rust spores are dry and powdery and will wipe off on a finger touching the area. The spore masses are visible on a finger tip as an orange powdery substance. Disease control involves sanitation and protective fungicide treatment. Diseased leaves should be removed and destroyed. If plants are severely diseased, plant removal is recommended. Heritage or Banner Maxx may be applied as a protective treatment in commercial situations. For homeowners, Fertiloam System Fungicide (propiconazole) is available. See Timely Information PP-506 by A. Hagan.

Phytophthora aerial blight on periwinkle and petunia is a common problem where plants receive frequent showers or irrigation. Disease usually begins as brown lesions or cankers on lower stem areas where moisture is most abundant. The fungus (Phytophthora) may spread to upper areas of the foliage when moisture is present. This is a difficult disease to control. Damaged plants should be removed and destroyed. Aliette may be applied to provide protective disease control, but control may not be complete. It would be best not to replant the area with periwinkles or petunias, which are very susceptible to this disease. See ANR-1023 by A. Hagan.

Fireblight on pear and apple was another commonly-seen disease in June. The initial infection begins in the blossoms and then spreads downward into the twigs, leaves, and branches. Infected plant tissues become black. Generally infected tissues inside stems and petioles are also dead and black. With 'Bradford' and other 'resistant' pear cultivars, disease will usually not progress more than 12-18 inches down a branch. Severe pruning is recommended. In the summer, cuts should be made 10-16 inches beyond the edge of the damage. See ANR-542.

With the moderate temperatures in June, brown patch was a common problem on most of our warm season grasses. Centipede and zoysia grass samples, especially, were received with brown patch. Usually brown patch is a foliage disease although it can occasionally involve crowns and roots of lawn grasses. Leaves develop brown blotches and blight. Brown patch is seen in a lawn as brown circular or irregular areas. In the lab, diagnosis is made on the basis of microscopic evidence of the diagnostic hyphae which can often be found inside leaf sheaths. Disease control is possible by following certain cultural practices and application of 3-4 treatments of a recommended fungicide. See ANR-492. Since Daconil is not available for homeowner use, we have been recommending Immunox which is somewhat easier to find than some other fungicides labelled for brown patch control.

We have seen Alternaria leaf spot as a minor occurrence on cotton from Dallas County. Leaf spots have been circular and relatively small (3 inch or less) with gray centers and reddish borders. Leaf spot incidence and severity seen thus far (in June and up to mid July) has been very low.

June 2002 Plant Diseases Seen In The Plant Diagnostic Lab at Auburn

Beans, GardenRhizoctonia Crown RotColbert
Beans, GardenRhizoctonia & Fusarium Lower Stem RotJackson
Beans, Garden VirusTallapoosa
BentgrassSting Nematode Damage (Belonolaimus)Jefferson
BermudaDollar Spot (Sclerotinia)Marengo
BermudaExserohilum Leaf BlightLee
Birch, RiverPhyllosticta Leaf SpotElmore, Limestone
CaladiumAnthracnose (Colletotrichum)Montgomery
CantaloupeWatermelon Mosaic VirusGeneva
CentipedeBrown Patch (Rhizoctonia)Covington, Montgomery, Lee
CornRust, Southern (Puccinia polypora)Pickens
CottonAlternaria Leaf SpotDallas
CottonPythium Root RotHouston
CryptomeriaCytospora CankerElmore
DaylilyKabatiella Leaf SpotLee
DaylilyPythium Crown & Root Rot *
DaylilyRust (Puccinia hemerocallidis) *
DogwoodSeptoria Leaf SpotTuscaloosa
DogwoodSpot Anthracnose (Elsinoe)Colbert
Gardenia, Daisy Pythium Cutting End RotMontgomery
GeraniumPythium Stem Rot *
HydrangeaCercospora Leaf SpotTallapoosa
HydrangeaPseudomonas Bacterial Leaf SpotLee
ImpatiensPythium Root and Crown RotMontgomery
LantanaPythium Root RotMarengo
Leyland CypressPestalotia BlightGeneva
LiriopeAnthracnose (Colletotrichum)*, Clay
MuscadineBlack Rot (Guignardia)Lee
OakMonochaetia Leaf SpotGeneva, Russell
Oak, ChestnutAlternaria Leaf SpotLawrence
Oak, WillowBotryosphaeria CankerDallas
Oak WillowSlime FluxDallas
PeanutAspergillus Crown RotButler
Peas, SouthernRhizoctonia Crown RotFayette, Lee
PepperTomato Spotted Wilt VirusCrenshaw, Russell
PeriwinkleAerial Phytophthora BlightMarengo
PetuniaPhytophthora Crown Rot *
RudbeckiaBacterial Leaf Spot *
SatsumaAnthracnose (Colletotrichum) *
SoybeanBacterial Leaf SpotPickens
St. AugustineTake-All Patch (Gaeumannomyces)Covington
StrawberryCommon Leaf Spot (Mycosphaerella)Lee
TomatoEarly Blight (Alternaria)Blount, Chilton, Elmore, Russell
TomatoFusarium Wilt Cleburne, Talladega
TomatoSouthern Blight (Sclerotium rolfsii)Lee
TomatoTomato Spotted Wilt VirusButler, Cleburne, Lee, Russell
WatermelonWatermelon Mosaic VirusGeneva
YewPestalotia BlightJackson
ZoysiaBrown Patch (Rhizoctonia)Colbert, Montgomery
ZoysiaRust (Puccinia)Colbert, Elmore
*Counties are not reported for greenhouse and nursery samples.

J. Jacobi
Extension Plant Pathology Specialist

The lab received 159 samples during the month of June. Some of the diseases seen last month included southern blight of coneflower and phlox, anthracnose (Discula) on flowering dogwood, quince rust on hawthorn, Alternaria leaf spot on Pittosporum, rust on snapdragon, and Monocaetia leaf blotch on southern red oak.

Symptoms of Monochaetia leaf blotch include large round spots often with pale green or yellowish centers and reddish brown margins. At a glance this foliar disease may resemble oak leaf blister, but it lacks the leaf distortion or blistering. Sanitation and proper tree care can minimize damage from this disease. Fungicides are seldom necessary or practical.

2002 June Diseases Seen In The Birmingham Plant Diagnostic Lab

AzaleaChemical DamageJefferson
BermudaHelminthosporium Leaf SpotJefferson (2)
BermudaLow pH/ Winter InjuryJefferson
BentgrassPythium Root RotJefferson, Talledega
BlueberryIron ChlorosisJefferson
BoxwoodHerbicide DamageJefferson
BoxwoodLeaf MinersJefferson
BoxwoodLow pHJefferson
BoxwoodVolutella BlightTuscaloosa
Centipede Iron Chlorosis (High Phosphorus)Jefferson
CentipedeSlime MoldJefferson
Cherry, Japanese, FloweringFungal Canker (Undetermined)Jefferson
Cherry, Japanese FloweringShot Hole BeetlesJefferson
Cherry LaurelShot HoleJefferson
ColumbinePowdery MildewJefferson
Coneflower Southern BlightJefferson
CrabappleCedar-apple RustJefferson
Crape MyrtleJapanese BeetleJefferson
CrocosmiaTwo-Spotted Spider MiteJefferson
Cypress, LeylandBagwormsCullman
Cypress, LeylandSeridium CankerCullman
DianthusPythium Crown and Root RotJefferson
Dogwood, FloweringAnthracnose (Discula sp.) Jefferson
Dogwood, Flowering Powdery MildewJefferson (2)
Dogwood, Flowering Septoria Leaf SpotJefferson
Dogwood, Flowering Spot AnthracnoseJefferson
EleagnusPhytophthora Root RotJefferson
EleagnusSouthern Red MitesJefferson
EuonymusEuonymus ScaleJefferson (2)
EuonymusPowdery MildewJefferson
GardeniaIron ChlorosisJefferson
GardeniaWhite FliesJefferson
HackberryHackberry Nipple Gall (Pachypslla)Jefferson
HawthornQuince Rust (Gymnosporangium)Jefferson
Holly, FosterTwo Lined SpittlebugJefferson (2)
Hosta Alternaria Leaf SpotJefferson
Indian HawthorneEntomosporium Leaf SpotJefferson
JuniperSpider MitesJefferson
LiropeSpider MitesJefferson
Maple, RedCottony Maple Leaf ScaleJefferson
Oak, ShumardOak Leaf BlisterJefferson
Oak, Northern RedOak Leaf BlisterJefferson
Oak, Southern RedMonochaetia Leaf BlotchJefferson (2)
Oak, Southern RedOak Leaf BlisterJefferson
Oak, WaterOak Leaf BlisterJefferson
PepperBlossom End RotJefferson
PhloxSouthern Blight (Sclerotium)Jefferson
PittosporumAlternaria Leaf SpotShelby
PotatoScab (Streptomyces)Jefferson
RhododendronCercospora Leaf SpotJefferson
RoseCanker (Phomopsis sp.)Jefferson
Silver Leaf MapleGirdling Injury (plastic mulch)Jefferson
St. AugustineChinch BugsJefferson
St. AugustineGray Leaf SpotJefferson
SnapdragonSpider MitesJefferson
Spruce 'Dwarf Alberta'Spider MitesJefferson
TomatoChemical InjuryJefferson (2)
*Counties are not reported for greenhouse and nursery samples


April to October, 2002:
Floriade 2002.
See the AmeriGarden (5,400 square feet), part of the world horticulture exhibition in the Netherlands.
For more information call 808-961-6660 or visit or

August 11-17, 2002:
American Society for Horticultural Science and XXVI International Horticultural Congress & Exhibition.
Metro Toronto Convention Centre, Toronto, Ontario, Canada.
Contact ASHS at 703-836-4606, Fax: 703-836-2024, E-mail:

August 14 - 16 2002:
Northern Plant Conference II.
Radisson Hotel, Eastlake, Ohio
Contact Randy Zontag at 440-350-2269; email or Associated Green Industries (AGI) at P.O. Box 123, Painesville, OH 44077-0123
phone: 440-350-2583; email:; URL:

August 26 - 28, 2002:
Horticulture Express.
Three days of touring nurseries, greenhouses, garden centers and botanical gardens of Georgia and South Carolina with the Alabama Nurserymen's Association. Registration deadline is July 25.
Call ANA at 334-821-5148 or email

September 3 - 5, 2002:
Auburn University Horticulture on Display.
Greenhouse renovation tour; golf tournament; clay events; Moore and Davis Nursery tour; reception and dinner; greenhouse educational program.
For information contact Ken Tilt at; phone 334-844-5484

September 21, 2002:
Alabama Christmas Tree Association Meeting.
Tarrant, Alabama
For information contact Ken Tilt at 334-844-5484 or

September 26, 2002:
Mountain Horticultural Crops Research Station Nursery Crops Field Day.
Ornamentals field day at the Mountain Horticultural Crops Research Station in Fletcher, North Carolina; 9-12
Email: for more information.

September 29-October 2, 2002:
Eastern Region International Plant Propagators' Society NA and IPPS Southern Region NA Annual Meeting.
Hunt Valley (Baltimore), MD.
Contact Margot Bridgen at 26 Woodland Road, Storrs, CT 06268; 860-429-6818, E-mail: or Dr. David L. Morgan, 332 Warbler Drive, Bedford, TX 76021; ph. 817-577-9272; e-mail,

October 1 - 3, 2002:
3rd Eastern Native Grass Symposium.
North Carolina Botanical Garden and Friday Center
Chapel Hill, NC
Contact Teresa Flora, NCBG, CB#3375, Chapel Hill, NC 27599

October 2 - 5, 2002:
The International Maple Symposium.
Westonbirt Arboretum, Tetbury, Gloucestershire, GL8, 8QS, England
Phone: 44(0) 1666 880220; fax: 44(0) 1666 880559

October 4-5, 2002:
Middle Tennessee Nursery Association Horticultural Trade Show.
McMinnville Civic Center, McMinnville, TN
phone: 931-668-7322; fax: 931-668-9601; e-mail:,
URL: or

October 6 - 9, 2002:
Composting in the Southeast Conference and Exposition.
Palm Harbor, FL
For information go to:

October 18 - 22, 2002:
American Society of Landscape Architects Meeting.
McEnery Convention Center, San Jose,California.
Contact ASLA, 636 Eye Street, NW, Washington, DC 20001-3736; phone 202-898-2444; fax 202-898-1185; URL

October 30 - November 2, 2002:
IPPS Western Region 43rd Annual Conference.
Sheraton Mesa Hotel & Convention Center, Mesa, Arizona
Contact Dr. Sheila Bhattacharya, V&P Nurseries, Inc., PO Box 4221, Mesa, AZ 85211-4221; phone 480-917-9847; fax 480-917-2856; email; URL

January 7 - 9, 2003:
Kentucky Landscape Industries Winter Educational Conference and Trade Show.
The Kentucky International Convention Center, Louisville, KY
Contact Betsie Taylor, KNLA Exec. Dir., 350 Village Drive, Frankfort, KY 40601; phone 502-848-0055 or 800-735-9791; fax 502-848-0032; email;

January 15 - 17, 2003:
Mid-AM Trade Show.
Navy Pier, Chicago, IL. Contact: Rand Baldwin at 847-526-2010, Fax 847-526-3993, e-mail

January 18 - 20, 2003:
Tennessee Nursery and Landscape Association Trade Show and Conference.
Chattanooga Convention Center, Chattanooga, TN
Phone 931-473-3951; fax 931-473-5883; email;

January 20 - 22, 2003:
Central Environmental Nursery Trade Show "CENTS".
Greater Columbus Convention Center, Columbus, Ohio
Contact Bill Stalter, ONLA at 800-825-5062; fax 800-860-1713; email;

January 30 - February 02, 2003:
ANLA Management Clinic.
Louisville, KY.
Contact ANLA at 202-789-2900; Fax, 202-789-1893

February 1 - 3, 2003:
Southern Region American Society for Horticultural Science Meeting.
Mobile, AL. Contact Paul Smeal, 1107 Kentwood Drive, Blacksburg, VA 24060-5656; phone 540-552-4085; fax 540-953-0805; email;

July 15 - 20, 2003:
ANLA Convention & Executive Learning Retreat.
Location TBA. Contact: ANLA, 202-789-2900; Fax, 202-789-1893.

July 30-August 2, 2003:
SNA 2003- Southern Nursery Association Researcher’s Conference and Trade Show.
Georgia World Congress Center, Atlanta, GA.
Contact SNA at 770-953-3311; Fax 770-953-4411; SNA Infoline, 770-953-4636.

September 30 - October 4, 2003:
American Society for Horticultural Science Annual Meeting and 100th Anniversary.
Providence, RI.
Contact ASHS at 703-836-4606, Fax: 703-836-2024, E-mail:

October 3-4, 2003:
Middle Tennessee Nursery Association Horticultural Trade Show.
McMinnville Civic Center, McMinnville, TN
phone: 931-668-7322; fax: 931-668-9601; e-mail:, or

October 5-8, 2003:
IPPS Southern Region NA.
San Antonio, TX.
Contact: Dr. David L. Morgan, 332 Warbler Drive, Bedford, TX 76021; phone 817-577-9272; e-mail,

October 22 - 25, 2003:
IPPS Eastern Region.
Portland, ME. Contact M. Bridgen, 26 Woodland Road, Storrs, CT 06268; phone 860-429-6818; email

July 29 - 31, 2004:
SNA 2004 - Southern Nursery Association Researcher’s Conference and Trade Show.
Georgia World Congress Center, Atlanta, GA.
Contact: SNA 770-953-3311; Fax 770-953-4411; SNA Infoline, 770-953-4636

October 1-2, 2004:
Middle Tennessee Nursery Association Horticultural Trade Show.
McMinnville Civic Center, McMinnville, TN
phone: 931-668-7322; fax: 931-668-9601; e-mail:, or

October 3-6, 2004:
IPPS Southern Region NA
Greenville/Spartanburg, S.C.
Contact: Dr. David L. Morgan, 332 Warbler Drive, Bedford, TX 76021; phone 817-577-9272; e-mail,

Send horticultural questions and comments to

Send questions and comments to

Letters to Bernice Fischman - 101 Funchess Hall - Auburn University, AL 36849.