Economic Injury Levels and Economic Thresholds for Cereal Aphids (Homoptera: Aphididae) on Spring-planted Wheat

Authors: Johnston, Richard L.; Bishop, Guy W.

Source: Journal of Economic Entomology, Volume 80, Number 2, April 1987 , pp. 478-482(5)

Publisher: Entomological Society of America

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Foliar insecticide treatments were applied at various stages of plant growth to control natural infestations of two cereal aphids, the English grain aphid, Sitobion avenae (F.), and the rose-grass aphid, Metopolophium dirhodum (Walker), in field plots of spring wheat. Yield increases of 2.7 t/ha (36.5%) and 1.2 t/ha (29.3%) were obtained when sprays were applied at flowering in 1984 and 1985, respectively. Lower but significant yield increases were also obtained when sprays were applied at the milky ripe and early dough stages. Depending on the cost of chemical treatment and price received per kilogram of wheat, the economic injury level was calculated to be 15 and 10 aphids per tiller in 1984 and 1985, respectively. Based on the plant growth stage and the rate of aphid population growth, economic thresholds were calculated to be 2–4 aphids per tiller at flowering, 6–10 aphids per tiller up to the milky ripe stage, and 10 or more aphids per tiller from the milky ripe to medium-dough stage. After the medium-dough stage, treatment cannot be justified.

Document Type: Research Article

Publication date: April 1, 1987

More about this publication?
  • 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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