EFFICACY OF SEED-TREATMENTS FOR MANAGEMENT OF NEMATODES ON COTTON IN GEORGIA.

Results from 26 cotton studies conducted in 2004, 2005, and 2006 are reported here. Field sites were naturally infested with either southern root-knot nematodes (Meloidogyne incognita), reniform nematodes (Rotylenchlus reniformis), or Columbia lance nematodes (Hoplolaimus columbus). Efficacy of new seed treatments AVICTA Complete Pak and AERIS Seed-Applied System were compared to that of aldicarb (Temik 15G), and to commercial seed treated with insecticides thiomethoxam (Cruiser) or Imidacloprid (Gaucho Grande). Fumigant 1,3- dichloropropene (Telone II) was evaluated in 10 trials. Root gall ratings assessed approximately 30 days after planting were typically significantly lower on plants treated with aldicarb than on plants from seed treated with AVICTA Complete Pak, AERIS Seed-Applied System, Cruiser, or Gaucho Grande. It was difficult to statistically differentiate the efficacy of AVICTA Complete Pak from aldicarb (Temik 15G, 5.0 lb/A), Cruiser, or Gaucho Grande based upon final lint yields. In 14 of 25 studies, plots treated with aldicarb, 5.0 lb/A, numerically outyielded plots where seeds treated with AVICTA Complete Pak were planted. The average yield advantage to aldicarb in these 14 trials was 119.5 lb lint/A; however in only one of the 14 trials was the yield difference between aldicarb and AVICTA Complete Pak significantly different. In 11 of 25 trials, plots that were planted to seeds treated with AVICTA Complete Pak out yielded plots treated with aldicarb (5.0 lb/A) with a yield advantage of 48.1 lb/A lint. Yields were significantly different in one of the 11 trials. Yield advantage to AVICTA Complete Pak over Cruiser or Gaucho Grande was 54.5 lb/A, though yield differences were statistically significant in only 1 of 25 trials. Where fumigation with 1,3-dichloropropene produced a significant increase in yield over use of seed treatment AVICTA Complete Pak (four of 10 trials), the increase in lint per acre varied from 224 lb to 615 lb. [ABSTRACT FROM AUTHOR]

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