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Stability of Resistance in Sorghum to Calocoris angustatus (Hemiptera: Miridae)

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Abstract:

Eight sorghum genotypes were evaluated for resistance to Calocori8 angustatus Lethiery (Hemiptera: Miridae) at three infestation levels (5, 10, and 15 pairs of adult bugs per panicle) over six seasons (1984-1987) under no-choice conditions in the head cage. 'IS 17610', and 'IS 17645' had significantly lower bug population increase as compared with the susceptible controls 'CSH 1', 'CSH 5,' and 'CSH 9'. These genotypes also suffered less grain damage and percentage loss in grain mass and showed higher seed germination than the susceptible controls. 'IS 2761' and 'IS 9692' generally had lower bug numbers, but suffered higher grain damage, showed poor seed germination, or both. Bug population increases did not differ significantly across infestation levels. However, grain damage and loss in grain mass was lower in panicles infested with five pairs per panicle. Among the commercial hybrids, 'CSH 9' was more susceptible as compared with 'CSH 1' and 'CSH 5'. 'IS 17610' was the most resistant and stable genotype over seasons and at different infestation levels. 'IS 17618' and 'IS 17645' were relatively unstable and their regression coefficients were significant across infestation levels in some seasons. The results suggested that environmental conditions play an important role in determining the interaction between the insects and the host plant.

Document Type: Research Article

Publication date: June 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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