The Russian wheat aphid, Diuraphis noxia (Mordvilko), is a recently introduced pest that is an economic threat to wheat, Triticum aestivum L., and barley, Hordeum vulgare L., production. Tall wheat grass, Agropyron elongatum (Host) Beauvois, in an important alternative summer host of the aphid and provides a food source for Russian wheat aphid populations between spring harvest and fall planting of cereal crops such as wheat and barley. Experiments were conducted in the greenhouse to identify Russian wheat aphid-resistant tall wheat grass plants obtained from the Western Regional Plant Introduction (PI) Station, USDAAHS, Pullman, WA. PI 401010 was resistant to leaf chlorosis and leaf curling caused by aphid feeding, and had decreased aphid reproduction compared with 'Jose' tall wheat grass. Further tests were conducted to characterize the plant components (antibiosis, antixenosis [nonpreference], and tolerance) contributing to resistance of PI 401010. PI 401010 had high levels of antibiosis, demonstrated by Russian wheat aphid's delayed reproductive maturity, shorter reproductive lifespan, and reduced rates of fecundity compared with 2 susceptible genotypes. When infested with Russian wheat aphids, plant heights were reduced and dry mass foliage loss per unit of aphid mass produced was high. A strong antixenosis (nonpreference) resistance component existed in PI 401010 when aphids were given a choice of several genotypes. PI 401010 is a new source of resistance for germ plasm enhancement efforts.
Document Type: Research Article
Publication date: October 1, 1995
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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.