| PLANT | DISEASE | DESCRIPTION | CONTROL |
| ANY plant |
Slime Mold | Not actually a disease; gray, black, pink, or yellow slimy or powdery masses on plants or soil; plasmodium or slime stage may be a mass of paper-thin ruffled 'sheets' the consistently of a thinnish layer of 'Jello'; the spore stage is often powdery with the coloration of black, pink, yellow or orange from spore production. | Wash off with a strong stream of water; physical removal. |
| AMARYLLIS |
Stagnospora Leaf Spot |
Fairly large (1/4 to 1/2" long) oval or elliptical or irregularly shaped red spots. |
Sanitation. Protective sprays of Cleary's 3336 or Domain. |
| ASH |
Anthracnose (Discula) | Brown irregular spots, blotches. |
Sanitation of fallen leaves. |
| AZALEA |
Aerial Blight (Rhizoctonia) |
Mostly seen in greenhouse-nursery situations; lower leaves become blighted and fall. |
Sanitation; protective fungicide sprays. |
| AZALEA |
Exobasidium Gall |
Swollen blossom, leaf, and shoot galls. From mid April - mid May, galls change from a green to a white or pink-white color. |
Sanitation; removal of galls while they are still green. Protective fungicide application may be made. |
| AZALEA |
Phytophthora Root Rot |
Roots brown and water-soaked. |
Sanitation. Protective fungicide drenches in nursery situations. |
| BEE BALM |
Powdery Mildew |
Powdery white dusting on leaves; blight; distorted new growth. |
Cleary's 3336; sanitation. |
| BEGONIA |
Bacterial Leaf Spot(Xanthomonas) |
Dark brown angular spots (about 5 mm diam. or less). Outer edges of spots may appear wet (water-soaked); centers of spots may dry and crack. Spots may coalesce. |
See the APMH; Sanitation. |
| BOXWOOD |
Volutella Blight |
Sunken cankers on stems and branches. Surface areas of cankers may be covered with orange spore masses of the fungus. |
Pruning of cankered stems. After pruning operations are complete, a protective spray treatment of Cleary's 3336 may be helpful. Avoid stressful situations. |
| BUDDLEA |
Sclerotium rolfsii - Crown Rot |
Brown decay at soil line. Brown, mustard seed-like structures of fungus may be present at soil line. |
Sanitation. See A. Hagan. |
| CAMELLIA |
Exobasidium Gall |
See azalea. |
Sanitation. |
| COLEUS |
Phytophthora Root Rot |
Roots are brown and watersoaked. Tops collapse. |
Sanitation. Avoid poorly drained sites. |
| COLEUS |
Pythium Root Rot |
Plants show poor growth, dieback; roots are discolored to a light brown; root cortex separates easily from the central cylinder. |
Sanitation; improve soil drainage. |
| CRABAPPLE |
Botryosphaeria Canker and Frogeye Leaf Spot |
Brown circular-irregular leaf spots with dark margins; sunken brown lesions on twigs, branches. |
Sanitation; Cleary's 3336, Domain, or a benomyl labeled for ornamentals may help. |
|
Cedar Apple Rust (Gymnosporangium) |
Bright yellow circular spots (1/4 - 1/2 inch diam.) on leaves; orange spore masses (circular projections) develop on leaves (lower leaf surfaces) and fruit. |
Remove junipers or apply protective fungicide sprays to crabapples. See APMH. | |
| CRABAPPLE |
Scab (Venturia inaequalis) |
Olive, slightly raised small spots develop on leaves and fruit. |
Sanitation. See the APMH for fungicides. |
| DOGWOOD |
Anthracnose (Discula) |
Large brown circular-irregular spots (1/4 - 1/2inch diam.) with dark brown-purple borders develop first on foliage of lower branches. Leaf spots merge. Dieback will result. Cankers develop. |
Sanitation. Protective fungicide sprays. |
| DOGWOOD |
Botrytis Blight |
Foliage shows grey-brown blotches, spots. |
See APMH under spot anthracnose. |
| DOGWOOD |
Phyllosticta Leaf Spot |
Small (1/4 inch or less) circular brown spots with dark brown margins. |
Sanitation of fallen leaves in the fall. See the APMH under Septoria. |
| DOGWOOD |
Phytophthora Crown & Root Rot |
Crown and root rot tissues brown discolored and water soaked. |
Sanitation. See the APMH for fungicide recommendations. |
| DOGWOOD |
Spot Anthracnose(Elsinoe) |
Small (1/16 inch or less diam.) circular reddish spots develop on bracts; spots on leaves are similar in size but brownish red in color and some leaf spots may be irregular in shape. |
Sanitation in the fall. Protective fungicide sprays recommended only for specimen trees. |
| ELM |
Powdery Mildew (Phyllactinia) |
White powdery patches develop on leaves; some leaf deformity. |
Sanitation of fallen leaves. See the APMH. |
| FORSYTHIA |
Crown Gall (Agrobacterium tumefaciens) |
Irregular, rough, somewhat sperical galls on branches and lower trunk. |
Sanitation; crop rotation. |
| GERANIUM |
Bacterial Blight(Xanthomonas) |
Black leaf spots and stem rot lesions. Yellow-brown wedges may develop in spotted areas of leaves. Lower leaves may wilt and die due to systemic infections. |
Sanitation. Bordeaux Mixture. |
| GINSENG |
Fusarium Root Rot |
Plants wilt and dieback or show poor growth. |
Crop rotation. |
| GREENHOUSE CROPS |
Tomato Spotted Wilt Virus |
Symptoms are variable but include gray-black leaf spots/blotches, yellow ringspot patterns, stunted growth malformed stunted and/or spotted new growth, and wilt. |
Sanitation; control thrips. |
| HAWTHORNE, INDIAN |
Entomosporium Leaf Spot |
Black, red bordered, circular spots. |
See APMH. |
| HOSTA |
Anthracnose (Colletotrichum) Leaf Spot |
Brown, irregularly-shaped leaf spots. |
Sanitation; Cleary's 3336 or Domain protective sprays. |
| HYDRANGEA |
Botrytis Blossom Blight |
Irregular brown spots and blotches on flowers. |
Sanitation; Cleary's 3336, Domain, or benomyl product. |
| HYDRANGEA |
Colletotrichum Blossom Blight |
Irregular brown spots blotches on flowers, sometimes orange patches of spores are present. |
Sanitation; Cleary's 3336 or Domain, or benomyl. |
| HYDRANGEA |
Phyllosticta Leaf Spot |
Brown circular spots, sometimes with dark border. |
Sanitation; Cleary's 3336 or Domain or benomyl product. |
| IMPATIENS |
Impatiens Necrotic Spot Virus |
Irregularly shaped black spots/blotches (1/8 - 1/4 inch diam. - usually) which may be confused with bacterial infection. Black ring spots may be present. |
Control thrips. Sanitation. |
| IMPATIENS |
Rhizoctonia Stem Rot |
Lower stems develop brown sunken lesions; plants dieback. |
Sanitation; Cleary's protective sprays; crop rotation. |
| IRIS |
Heterosporium Leaf Spot |
Small-large (1/4-1/2 inch long), elliptical or oval shaped medium brown leaf spots. |
Sanitation. See APMH. |
| IRIS |
Rust (Puccinia) |
Small, red-orange, powdery, raised spots. |
Sanitation. |
| IVY, ENGLISH |
Anthracnose (Colletotrichum) |
Irregularly-shaped brown leaf spots. |
Sanitation; See the Alabama Pest Management Handbook. |
| JUNIPER |
Kabatinia Tip Blight |
Juniper twigs dieback; appears similar to Phomopsis tip blight. |
Sanitation; refer to fungicides listed for control of Phomopsis tip blight. |
| JUNIPER |
Pestalotiopsis Blight |
Blight of inner foliage of stressed plants. |
Sanitation. See the APMH under Phomopsis Twig Blight for protective fungicides. |
| JUNIPER |
Phomopsis Blight |
Tips of twigs on lower branches become brown. The blight spreads down the twig and upward in the plant. |
Sanitation. See the APMH. |
| JUNIPER |
Phytophthora Root Rot |
Roots brown, water-soaked. |
APMH. |
| LEYLAND CYPRESS |
Botryosphaeria Canker |
Elongate sunken trunk and branch brown lesions. |
Sanitation. |
| LEYLAND CYPRESS |
Seiridium Canker |
Elongate sunken trunk and branch brown lesions. |
Sanitation. |
| LEYLAND CYPRESS |
Pestalotiopsis Canker |
Elongate sunken trunk and branch brown lesions. |
Sanitation. |
| LIGUSTRUM |
Cercospora Leaf Spot |
Medium brown, irregularly shaped spots (1/4 - 1/2 inch long). |
Sanitation. See the APMH. |
| LUPIN |
Rhizoctonia Crown Rot |
Brown dried lesions on stems near the soil line. |
Sanitation. |
| MAGNOLIA, SOUTHERN |
Algal Leaf Spot(Cephaleuros) |
Usually circular, greenish, slightly raised spots. Spot edges slightly more raised than spot center. Edges are irregular. |
Sanitation. See the APMH. |
| MAGNOLIA, SOUTHERN |
Bacterial Leaf Spot |
Small, angular, water-soaked spots. |
Sanitation. Kocide 101 or bordeaux mixture. |
| MAPLE |
Anthracnose(Kabatiella) |
Brown-black spots/blotches which often follow along leaf veins; sometimes blotchy areas occur along leaf edges. |
Sanitation. See APMH, for small trees. |
| MAPLE |
Purple Eye Spot (Phyllosticta) |
Purple circular spots (about 1/4 inch diam.) with dark purple, black border. |
Sanitation. See the APMH. |
| MAPLE |
Tar Spot (Rhytisma) |
Black irregularly-shaped spots. |
Sanitation of fallen leaves this fall. See the APMH. |
| MAPLE, JAPANESE |
Phyllosticta Leaf Spot |
Brown circular spots with dark brown or purple margins. |
Sanitation of fallen leaves this fall. See the APMH. |
| MONDOGRASS |
Anthracnose (Colletotrichum) |
Gray-brown spots, blotches, often at leaf tips, margins. |
Sanitation. Cleary's or Domain. |
| OAK |
Anthracnose(Apiognomonia) |
Medium-brown blotches along leaf veins, in interveinal areas and along leaf margins. |
Sanitation. See APMH for small trees. |
| OAK |
Oak Leaf Blister (Taphrina) |
Concave-convex spot areas that are slightly swollen and slightly discolored. |
Sanitation. See APMH. |
| OXALIS |
Kuehneola Rust |
Orange powdery pustules on leaves. |
Sanitation. |
| PETUNIA |
Phytophthora Root Rot |
Roots brown, wet, easily pulled apart. |
Sanitation. Avoid wet soils. |
| PHLOX |
Alternaria Leaf Spot |
Dark brown irregularly-shaped spots. |
Sanitation; Cleary's 3336 or Domain or an ornamental benomyl product. |
| PHOTINIA |
Entomosporium Leaf Spot |
Red-black circular-irregularly shaped spots which often coalesce; leaf drop. |
Sanitation. Protective fungicide sprays. |
| PINE |
Needlecast Diseases |
Older needles turn brown, drop. |
See APMH. |
| PINE |
Needle Rust (Coleosporium) |
Cream-orange-colored pustules up to 1/8" or 2-3 mm in size occur on needles only of pine. |
Remove asters from the area. |
| PINE |
Pitch Canker |
Sunken, cracked lesions on branches, trunks where resinosis is common. |
Sanitation. See the APMH for comments. |
| RHODODENDRON |
Exobasidium Gall |
Fleshy, swellings of leaves, flowers. Swellings initially are green but become white or pink when spore production occurs. |
Sanitation; Bayleton in some circumstances. See APMH. |
| ROSE |
Black Spot(Diplocarpon) |
Black spots (1/8 - 1/4 inch diam., 4-8 mm) with feathery margins. |
Follow a regular spray schedule; sanitation. |
| ROSE |
Botrytis Blossom Blight |
Blossoms develop small-large brown blotches. A gray delicate webbing of the fungal mycelium and spores may develop over blotches. |
Sanitation. Protective fungicide sprays. |
| ROSE |
Brand Canker (Coniothyrium) |
Gray, cracked, irregular canker on canes. |
Sanitation; funigicides that are recommended for black spot will help. |
| ROSE |
Mosaic |
Distinct pattern of dark green & light green or yellow on leaves. |
Control weeds; control insects; remove diseased plants. |
| ROSE |
Powdery Mildew (Sphaerotheca) |
White powdery patches on foliage; some leaf deformity may occur on new growth. |
See the APMH. |
| ROSE |
Tobacco Ringspot Virus |
Plants stunted, mottled. |
Sanitation; Control nematodes. |
| SPIREA |
Powdery Mildew |
White, powdery dusting on surface of leaves; some leaf distortion; leaf blight. |
Sanitation; Cleary's 3336. |
| SYCAMORE |
Anthracnose(Apiognomonia) |
Gray-brown blotches on leaves; sometimes blotches follow leaf veins or leaf margins. |
Sanitation. Protective fungicide sprays for small trees. |
| SYCAMORE |
Scorch (Xylella) |
Leaves become brown and dried at the margins; dieback during summer months. |
Tree pruning or removal. |
| VINCA |
Alternaria Leaf Spot |
Circular-angular dark brown-black spots. |
Sanitation. Cleary's 3336 or Domain should give protective control. |
| VINCA |
Phytophthora Stem Rot |
Sections of stems become brown, wet, and collapsed, shrivelled. |
Sanitation. In some cases Aliette WDG may be used as a protective treatment.
See APMH. |
| VINCA |
Rhizoctonia Aerial Blight |
Dark brown dried cankers on stems. Tops dieback. |
Sanitation. Cleary's 3336 may be used in some situations. See the APMH. |
| WILLOW |
Leaf Rust (Melampsora) |
Yellow orange pustules on leaves. |
Sanitation. |
