EFFICACY OF NEMATICIDES WITH THRIPS-MANAGEMENT CONSIDERATIONSON SOUTHERN ROOT-KNOT AND COLUMBIA LANCE NEMATODES IN GEORGIA

摘要

Five trials were conducted in 2003 to compare the efficacy of aldicarb (Temik 15G) to either imidacloprid (Gaucho 480F) orto thiamethoxam (Cruiser 5FS) alone and in combination with 1,3-dichloropropene (Telone II) in fields where nematodeswere 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 trialsfor 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 orthiamethoxam was never statistically significant; however the aldicarb numerically out-yielded one or the other of thesecompounds in three of four direct comparisons. When combinations of aldicarb + 1,3-dichloropropene were compared tocombinations of 1,3-dichloropropene with either imidacloprid or thiamethoxam, differences in yield were not statisticallysignificant; however the combination with aldicarb had the greater numerical yield in four of five trials. Because the interactionbetween location and treatment was not significant at p=0.05, data were analyzed across four field sites where aldicarband imidacloprid were compared. Differences between aldicarb and imidacloprid were not significant nor were they differentin combination with 1,3-dichloropropene. Yields from treatments that included 1,3-dichloropropene were significantlygreater than those which included only aldicarb or imidacloprid, but were not different from the aldicarb applied in-furrow atplanting followed by a sidedress application. Two applications of Temik 15G at 5 lb/A was as effective as Telone II treatmentswhen populations of southern root-knot nematodes were moderate.