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Effects of Greenbugs on Resistant and Susceptible Sorghum Seedlings in the Field

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Infestations of seedlings by Schizaphis graminum (Rondani) reduced grain and forage yields of a susceptible grain sorghum, Sorghum bicolor (L.) Moench, 'Combine Kafir-60' (CK-60), but did not reduce yields of greenbug-resistant sorghums. Greenbug feeding caused reduced tillering, plant height, and delayed maturity more in susceptible than resistant sorghums, but seed weights were not effected. Reduction in numbers of secondary culms of susceptible CK-60 appeared to be primarily, responsible for Yield losses of surviving plants. Susceptible seedlings need protection from greenbugs to achieve maximum yields. Heterozygous resistant genotypes may approach maximum yield potential without supplemental greenbug control.

Document Type: Research Article

Publication date: June 1, 1974

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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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