Effect of Biotype and Temperature on Fitness of Greenbug (Hemiptera: Aphididae) on Sorghum

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The greenbug, Schizaphis graminum (Rondani) (Hemiptera: Aphididae), is a major aphid pest of small grains and sorghum, Sorghum bicolor (L.) Moench. Greenbugs extract juice and inject toxin, killing seedlings or limiting the yield of older plants. Understanding greenbug biology and how biotypes develop is important for evaluating and developing sorghum with durable resistance. Prereproductive period, fecundity, and longevity of greenbug biotypes E and I were assessed on susceptible ‘RTx430’ sorghum at four cycling temperatures of 10–23, 14–27, 18–31, and 22–35°C in an incubator. A photoperiod of 14:10 (L:D) h corresponded with daily warm and cool temperatures. Greenbug fitness was more affected by temperature than biotype. Greenbug prereproductive period, total fecundity, and longevity did not differ among temperature regimes except at the warmest regime (22–35°C), at which all parameters were greater for biotype E than biotype I. The prereproductive period of greenbug biotypes E and I combined was more than twice as long at the coolest temperature of 10–23°C as at 22–35°C. Greenbugs produced a maximum average of 3.3 more nymphs per day at warmer than cooler temperature regimes. Average total fecundity was greatest at 10–23°C, with fewest nymphs being produced at 22–35°C. Longevity of greenbug biotypes E and I combined was 6 times longer at 10–23°C than at 22–35°C. This study provides information on optimal temperatures under which to evaluate damage to sorghum being developed for resistance to different biotypes of greenbug.

Keywords: Schizaphis graminum; biotype; greenbug; plant resistance; sorghum

Document Type: Research Article

Publication date: August 1, 2009

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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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