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Damage to Grain Sorghum by Fall Armyworm and Corn Earworm

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In field tests, no significant loss in yield occurred when whorls of grain sorghum, Sorghum bicolor (L.) Moench, were infested with 2, 4, 8, or 16 first instars of the fall armyworm, Spodoptera frugiperda (J. E. Smith), at 10 or 20 days after planting. However, infestations applied at 30–49 days after planting caused a high yield loss that increased progressively as the number of larvae increased. When similar infestation levels of corn earworms, Heliothis zea (Boddie), were applied, loss was greatest when sorghum heads were infested at 50% bloom. Injury was less when heads were infested 2 wk after bloom. Increasing the number of corn earworm larvae above 2/head did not increase loss of yield significantly.

Document Type: Research Article

Publication date: August 1, 1979

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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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