Bahiagrass, corn, cotton rotations, and pesticides for managing nematodes,diseases, and insects on peanut

Florunner peanut was grown after 1 and 2 years of Tifton 9 bahiagrass, corn , cotton, and continuous peanut as whole-plots. Pesticide treatments aldica rb (3.4 kg a.i./ha), flutolanil (1.7 kg a.i./ha), aldicarb + flutolanil, an d untreated (control) were sub-plots. Numbers of meloidogyne arenaria secon d-stage juveniles in the soil and root-gall indices of peanut at harvest we re consistently lower in plots treated with aldicarb and aldicarb + flutola nil than in flutolanil-treated and untreated plots. Percentages of peanut l eaflets damaged by thrips and leafhoppers were consistently greater in flut olanil-treated and untreated plots than in plots treated with aldicarb or a ldicarb + flutolanil but not affected by cropping sequences. Incidence of s outhern stem rot was moderate to high for all chemical treatments except th ose that included flutolanil. Stem rot loci were low in peanut following 2 years of bahiagrass, intermediate following 2 years of corn or cotton, and highest in continuous peanut. Rhizoctonia limb rot was more severe in the p eanut monoculture than in peanut following 2 years of bahiagrass, corn, or cotton. Flutolanil alone or combined with aldicarb suppressed limb rot comp ared with aldicarb-treated and untreated plots. Peanut pod yields were 4,18 6 kg/ha from aldicarb + flutolanil-treated plots, 3,627 kg/ha from aldicarb -treated plots, 3,426 kg/ha from flutolanil-treated plots, and 3,056 kg/ha from untreated plots. Yields of peanut following 2 years of bahiagrass, cor n, and cotton were 29% to 33% higher than yield of monocultured peanut.