Abstract
Studies were conducted at two environments during 1978 and 1979 so that we could determine early-season insect damage on selected glabrous and nectariless coltons, Gossypium hirsutum L. To have different insect populations, we applied two granular insecticides (aldicarb and slow-release acephate) as sidedress applications. Insecticide treatments did not significantly affect plant bugs, Lygus lineolaris (Palisot de Beauvois) (Hemiptera: Miridae), but did significantly affect leafhoppers (primarily Empoasca ), total lint yield, and lint yield at first picking. Significant varietal differences were shown with plant bug populations, leafhopper populations, total lint yield, and lint at first picking. Glabrous cottons had the highest insect populations and the lowest yields. Significant or highly significant negative correlations were shown between leafhoppers and yield (total and first picking) at two environments and for the mean of all four environments.
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