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Weight Compensation of Undamaged Kernels in Response to Damage by Sorghum Midge (Diptera: Cecidomyiidae)

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The relationship between level of sorghum midge, Contarinia sorghicola (Coquillett), damage and weight of undamaged kernels, panicle sterility, and kernel weight was investigated in midge resistant and susceptible sorghum, Sorghum bicolor (L.) Moench, hybrid cultivars. A significant inverse relationship existed between the proportion of spikelets destroyed by midges and the weight of undamaged kernels in two of three susceptible hybrids as well as in three of seven case for two resistant hybrids. In only one trial involving a midge resistant hybrid was there a positive correlation between the two variables. However, these relationships were generally not significant at levels of damage below 40%. A significant positive relationship between the percentage of sterile panicle spikelets and of developed kernel weight occurred in half of the cases. Results of this study signify that for midge damage levels near economic threshold levels, the percentage of spikelets damaged by midges was approximately equal to percentage of yield loss—i.e., there was no compensation for midge damage. Partial sterility did not simulate midge damage.

Document Type: Research Article

Publication date: August 1, 1984

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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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