Abstract
Larger numbers of beneficial insects were found in cotton growing immediately adjacent to sorghum, rows 1-12, than in cotton grown distal to this strip-crop, rows 13-24. The cotton-corn association exhibited the reverse effect. Lady beetles, Hippodamia spp., were one of the main predators, with significantly more individuals being found in cotton adjacent to sorghum than in the cotton associated with corn. As the season progressed, the level of beneficial organisms declined, except for the occurrence of lady beetles. Lady beetles exhibited the only significant increase in population during the late-season bollworm, Heliothis zea (Boddie), increase. Parasitism varied throughout the season and averaged 26.3%. Sorghum proved to be the best associate crop because of its effect on beneficial organisms and its ability to provide a marketable crop in southwest Oklahoma.
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