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Damage by Greenbug (Homoptera: Aphididae) to Grain Sorghum as Affected by Tillage, Surface Residues, and Canopy

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Abstract:

Different cropping systems for grain sorghum were studied at two Texas locations and one Nebraska location to determine effects of tillage practice, cropping systems, crop residues, and plant canopy on greenbug, Schizaphis graminum (Rondani), abundance and crop damage. In each case, reduced tillage or crop residues on the soil surface (or both) resulted in a decreased number of greenbugs and amount of plant injury. In one study, a greenbug-resistant grain sorghum hybrid conventionally tilled was more severely damaged than a susceptible hybrid planted in a no-tillage situation, indicating the negative effect of reduced tillage on greenbug abundance. Influence of reduced tillage on green bug density occurred on plants in plots as large as 2.8 ha. In one grain sorghum field, a dense canopy of a weedy grass that obscured furrows substantially reduced greenbug infestation. In other fields, independent of surface residues and canopy, greenbugs seemed to distinguish between amount of cultivation and preferred plants growing in soil with the greatest amount of disturbance. Apparently, green bugs respond to background conditions of the host plant associated with tillage operations and seem to be repelled by crop residues, canopy, and the reduced tilled soil surface.

Document Type: Research Article

Publication date: August 1, 1987

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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