Abstract
There insecticides applied at 2 dosages and 2 application intervals (3×2×2 factorial) were used in a preventive boll weevil. Anthonomus grandis Boheman, control program consisting of 3 or 4 early-season applications beginning at the 8-leaf stage of cotton growth plus late-season applications beginning the last week of July and continuing to by exceeding minimum recommended dosages or reducing maximum recommended intervals. Statistically significant but relatively small practical differences in boll weevil control, square production, and yield were noted among treatments of azinphosmethyl-DDT, carbaryl, and toxaphene-DDT. In comparison with nearly untreated cotton, the preventive treatments reduced the boll weevil population 81% in early and mid-season and 77% in late season. The treatments increased the yield of seed cotton 1378 lb/acre, averting a 42% reduction in boll set and 41% boll damage. In comparison with a treatment schedule based upon 10% square infestation, the preventive schedule (1) reduced the late season boll weevil population 88%, (2) shortened the fruiting period about 10 days, (3) was easier to follow, and (4) required only about half as many applications. Similar yields were obtained with the 2 schedules.
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