Influence of plant maturity and application timing on efficacy of dicrotophos for control of cotton aphid
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Efficacy of dicrotophos for controlling the cotton aphid, Aphis gossypii Glover, was investigated at the Texas Agricultural Experiment Station at Chillicothe in 1992-1994. Cotton was planted in late April, late May, and late June each year, and dicrotophos, at 0,5 lb Al/acre, was applied as aphid numbers began increasing during August A single application was made at different aphid densities within each planting date. A treatment threshold of 35-50 aphids per leaf can be used for all three planting dates A single application prevented development of high numbers for extended periods in the late April and late May planting dates; in some years populations of 50 aphids per leaf did not develop in these two plantings. Multiple applications will probably be necessary to control aphids in late June cotton.