The effects of Lorsban 4E applications for pink bollworm control were assessed for populations of beneficial arthropods and secondary pests on Acala cotton in New Mexico. Treatments consisted of early-, mid-, late-season, and season-long applications of lorsban applied at 10-day intervals. Populations of beneficials and plant bugs were estimated with a vacuum sampler, aphids with leaf counts, and pink bollworm with examination of bolls. Aphid populations were very low the first season –peaking at an average of slightly over 4 per leaf. Late-season pink bollworm infestations reached as high as 56.3% in the late season treatment. Lorsban applications did not appear to affect the seasonal abundance of the majority of predaceous Heteroptera, lacewings, or plant bugs. Only populations of Geocoris and spiders were significantly less than the control. Lady beetle numbers were significantly lower numbers in the 1AP and 2 AP treatments. This is likely credited to low aphid populations that did not begin to build until just prior to the beginning of the 3AP treatment.
Species 1: Lepidoptera Gelechiidae Pectinophora gossypiella (pink bollworm)
Species 2: Homoptera Aphididae Aphis gossypii (cotton aphid, melon aphid)
Species 3: Heteroptera Lygaeidae Geocoris (bigeyed bug)
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