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Our experiments sought to assess the effects of Russian wheat aphid, Diuraphis noxia (Mordvilko), on spring and winter wheat (Triticum aestivum L.) at different plant growth stages. Four initial aphid densities of 0, 1, 2, and 4 aphids per plant were used to infest the seedling, tiller, and boot stages of spring wheat. The same aphid treatments were used to infest winter wheat before, after, and both before and after the vernalization process. Plants were harvested and the following vegetative and reproductive parameters were measured: root weight, stem weight, leaf weight, tiller number, head weight, seed number, and seed weight. Spring wheat infested during the tiller and boot stages was most susceptible to reductions in head weight, seed number, and seed weight. Winter wheat was most sensitive to Russian wheat aphid after the vernalization process. Root weight, head weight, seed number, and seed weight were all reduced when aphids were introduced after vernalization had occurred, especially at the highest initial aphid infestation level.
Document Type: Research Article
Publication date: December 1, 1990
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.