ABSTRACT

Five trials were conducted in 2003 to compare the efficacy of aldicarb (Temik 15G) to either imidacloprid (Gaucho 480F) or to thiamethoxam (Cruiser 5FS) alone and in combination with 1,3-dichloropropene (Telone II) in fields where nematodes were believed to be a problem on cotton. Temik 15G (5 lb/A at plant + 5 lb/A sidedress) was included in four of the five trials for comparison. Southern root-knot nematode, Meloidogyne incognita, was found at three sites; Columbia lance nematode, Hoplolaimus columbus, was found in the other two sites. The difference in yield between aldicarb and imidacloprid or thiamethoxam was never statistically significant; however the aldicarb numerically out-yielded one or the other of these compounds in three of four direct comparisons. When combinations of aldicarb + 1,3-dichloropropene were compared to combinations of 1,3-dichloropropene with either imidacloprid or thiamethoxam, differences in yield were not statistically significant; however the combination with aldicarb had the greater numerical yield in four of five trials. Because the interaction between location and treatment was not significant at p=0.05, data were analyzed across four field sites where aldicarb and imidacloprid were compared. Differences between aldicarb and imidacloprid were not significant nor were they different in combination with 1,3-dichloropropene. Yields from treatments that included 1,3-dichloropropene were significantly greater than those which included only aldicarb or imidacloprid, but were not different from the aldicarb applied in-furrow at planting followed by a sidedress application. Two applications of Temik 15G at 5 lb/A was as effective as Telone II treatments when populations of southern root-knot nematodes were moderate.