Field experiments were conducted by caging groups of pea plants, Pisum sativum L., or pairs of flowers and pods and infesting them with various densities of pea aphid, Acyrthosiphon pisum (Harris). Plants infested up to time of flowering recovered from the damage and their yield was normal. Infestation of plants until flowers opened or longer reduced dry matter production, increased number of flowersand pods shed, reduced number of pods per plant and number of seeds per pod, increased percentage of empty pods, reduced weight of 1,000 seeds and yield of seeds, reduced weight of nitrogen-fixing root nodules, but did not affect protein content of seeds. All flower and pod stages were sensitive to direct feeding damage, but young pods were most susceptible. Feeding damage to flowers and pods was highly correlated with aphid density and young pods infested with four aphids for 4 days showed significant reductions in yield. We conclude that field peas must be protected from pea aphids for a 2- to 3-week period beginning when pods start to form.
Document Type: Research Article
Publication date: December 1, 1985
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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.