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Prevalence of Predators Associated with Acyrthosiphon pisum (Homoptera, Aphididae) and Hypera postica Gyllenhal (Coleoptera, Curculionidae) During Growth of the 1 st Crop of Alfalfa

K. Giles ; J. Obrycki ; T. Degooyer | 1994

In 1991 and 1992, Coleomegilla maculata Timberlake adults (Coleoptera: Coccinellidae) were the most abundant predators prior to first cutting in alfalfa (Medicago sativa L.) from 16 April to 7 June at four locations in Iowa. Relative populations[...]

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Seedling stage feeding by corn leaf aphid (Homoptera: Aphididae): influence on plant development in Maize

J. Bing ; W. Guthrie ; F. Dicke ; J. Obrycki | 1991

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Stylet penetration and feeding sites of Rhopalosiphum maidis (Homoptera: Aphididae) on two growth stages of Maize

J. Bing ; M. Novak ; J. Obrycki ; W. Guthrie | 1991

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