Cotton varieties were examined with and without Telone II for their response to the reniform nematode (Rotylenchulus reniformis) in south Alabama.  The test was conduced in a producers field naturally infested with the reniform nematode and monocultured in cotton.  The soil was a silty loam.  Telone II 6 gal/a was applied two weeks before planting by injecting the chemical 12 inches deep with shanks directly in the row.  Di-Syston 7 lb/a was applied  at planting in the seed furrow with chemical granular applicators attached to the planter.  Plots consisted of 1 row, 25ft long with a 36 inch row spacing.  All plots were arranged in a split plot design with six replications.  Blocks were separated by a 20 foot alley.  All plots were maintained with standard production practices recommended by the Alabama Extension Service commonly used in the area.  Plots were not irrigated.  Population densities of reniforme nematode were determined at planting and at harvest.  Ten soil cores, 1-in diameter and 8- in deep were collected from the two center rows of each plot in a systematic sampling pattern.  Nematodes were extracted using gravity sieving and sucrose centrifugation technique.  Plots were harvested 18 Oct.

The season was cool and dry initially but adequate moisture through the season produced a good cotton growth.  Reniform nematode numbers increased in all plots regardless of variety or nematicide.  DP  451BR, PM 1218BR, SG 215BR, and  PM 1199RR all produced a significantly lower final reniform populations compared to  SG 501BR.  Cotton seed yield varied 1034 lb/a for the DP 655BRR and SG 501BR respectively without Telone II.    Cotton seed yield varied 932 lb/a for the Germain’s GC-271  and Phyto’gen Phy 72 Acala respectively with the application of Telone II. The application of Telone II increased yields over all  varieties by 298 lb seed cotton per acre.  Three varieties, DP 458BRR, SG 501RR, and PM 1218BG/RR produced numerically  greater yields with TeloneII than without.

Cotton Variety                                    Reniform/150cc of soil                 Yield lb seed cotton/A
                                                        Treated             Untreated           Treated            Untreated
Deltapine NuCotton 33B     5717 bcd     7648 abc     2407 c-j     1914 fgh
Deltapine NuCotton 35B     4017 bcd     7854 abc     2504 b-h     2286 cde
Deltapine DP 5415 RR/      4661 bcd     7081 abc     2281 f-j     2165 def
Deltapine DP 20B           7519 ab      4223 c       2330 e-j     1958 fgh
Deltapine DP 451B/RR      10738 a       7253 abc     2233 hij     2136 d-g
PhytoGen PSC 161           5605 bcd     9322 ab      2697 a-d     2132 d-g
Fiber Max FM 989           4996 bcd     4790 c       2175 ij      2083 efg
Sure-Grow 821              4275 bcd     6103 abc     2310 e-j     2030 efg
Sure-Grow 747              5227 bcd     6309 abc     2707 abc     2571 ab
Paymaster PM 1560BG/RR     5279 bcd     5717 abc     2509 b-h     2155 def
Deltapine DP 436RR         5768 bcd     6257 abc     2315 e-j     1861 ghi
Deltapine DP 458BRR        4687 bcd     9364 ab      2504 b-h     2503 a-d
Deltapine DP 655BRR        5279 bcd     5390 abc     2528 b-h     1571 j
PhytoGen PSC 355           4120 bcd     5450 abc     2262 h-j     2025 efg
PhytoGen HS 12             4067 bcd     6566 abc     2625 a-e     2194 def
Stoneville ST 4691B        4481 bcd     8163 abc     2397 c-j     2267 cde
Stoneville ST 4892BR       6978 abc     6232 abc     2649 a-d     2170 def
Sure-Grow 125BR            5176 bcd     5356 abc     2668 a-d     2484 abc
Sure-Grow 501BR            2318 d       7931 abc     2480 b-i     2605 a
Paymaster PM 1218BG/RR     6129 bcd     8025 abc     2146 jk      2286 cde
DP Delta Pearl             6051 bcd     5176 abc     2692 a-d     2504 abc
GARST/AgriPro 1500RR       6566 a-d     4893 bc      2320 e-j     2054 efg
Fiber Max FM 966           3863 bcd     8111 abc     2426 c-j     2093 efg
Sure-Grow 521R             7854 ab      4584 c       2586 b-f     2117 d-g
Deltapine DP 565           3039 cd      9656 a       2393 c-j     1924 fgh
Deltapine DP 491           3966 bcd     5047 bc      2562 b-g     2064 efg
Germain’s GC-271           4017 bcd     7768 abc     2774 ab      2301 b-e
PhytoGen Phy 72 Acala      6824 abc     7056 abc     1842 k       1619 ij
Stoneville ST 580          5794 bcd     5974 abc     2383 d-j     2107 efg
Stoneville ST 580          7236 abc     5768 abc     2325 e-j     2146 def
Delta pine DP 555 BG/RR    7819 ab      6206 abc     2929 a       2397 a-d
FP (LSD P=0.05)            4516         4516          318          318

*Di-Syston (7 lb/A - at planting) added in all treatments without Telone II.
Means compared using Fisher’s protected least significant difference test (P=0.05).

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