Impact of early-season pesticide treatments for control of Lygus lineolaris (Hemiptera: Miridae) on predators of Helicoverpa zea (Lepidoptera: Noctuidae) in Cotton

摘要

The impact of early-season pesticide applications on beneficial arthropods necessary for control of mid- and late-season bollworms, Helicoverpa zea (Boddie), was determined in 1994 and 1995 by monitoring densities of arachnids, insidious flower bugs, and big-eyed bugs following treatment of plots with early-season pesticides. Densities of these arthropods decreased 1 d after treatment in most plots. At 3 and 7 d after treatment densities began to increase. Densities of arachnids in 1994 did not regain pre-treatment levels by 14 d after treatment. Arachnid densities in 1995, in select plots exceeded pre-treatment levels 14 d after treatment. In 1994 and 1995, the densities of insidious flower bugs at 14 d after treatment surpassed pre-treatment densities. Densities of big-eyed bugs 14 d after treatment in 1994 and 1995, did not regain pre-treatment levels.