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Insect Resistance Evaluations: Effect of Cultivar Position and Time of Rating

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Differences in insect damage to resistant and susceptible cultivars are sometimes difficult to quantitate because of position effects or the time when data are recorded. A factorial experiment was used to compare position effects (RS, SR, RR, or SS) on damage done to resistant (R) and susceptible (S) cultivars of sorghum, Sorghum bicolor (L.) Moench, and corn, Zea mays L., by the fall armyworm, Spodoptera frugiperda (J. E. Smith), and the sorghum midge, Contarinia sorghicola (Coquillett). When R1, R2, S1, and S2 pairings were set up, damage done to the resistant and susceptible was significantly different in all instances except one. Generally, mean differences showed no differences between like pairs when damage rating was adjusted for performance in mixed pairings. Time of recording data was shown to be critical only when severe fall armyworm infestations were used to screen seedling plants. Position (RxR, RxS, SxR, or SxS) was not important in detecting differences between the R and S.

Document Type: Research Article

Publication date: June 1, 1980

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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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