Potential of Wheat Cultivar Mixtures for Green bug (Homoptera: Aphididae) Management

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Green bug, Schizaphts graminum (Rondani), biotypes C and E were used to test mixtures of susceptible and resistant cultivars of wheat, Triticum aestivum L. Three tests were completed in this study. In the first test, two wheat cultivars were used-one susceptible and one resistant to biotype C green bugs. The cultivars were mixed in five ratios ranging from 100 to 0% resistance and infested with green bugs at three different levels. The second test was similar, except biotype E green bugs and the appropriate resistant cultivar were used. Based on damage ratings, plant height measurements, and population levels attained after 2 wk, a cultivar ratio of 75% resistant: 25% susceptible plants can be used to manage biotype C and E green bugs. In the third test, mixtures of biotypes C and E were used to infest mixtures of three wheat cultivars. One cultivar was resistant to biotype C, one was resistant to biotypes C and E, and the third cultivar was susceptible to both. Only one infestation level was used in this part of the study. Plant damage ratings, plant height measurements, and population levels were analyzed 2 wk after infestation. The results from the test with mixtures of biotypes C and E indicated that there was no advantage to using mixtures of three rather than two cultivars.

Document Type: Research Article

Publication date: October 1, 1991

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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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