Wednesday, 29 October 2003 - 8:24 AM
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This presentation is part of : Ten-Minute Papers, Section Fa. Host Plant Resistance, Fb. Urban Entomology

Identification of Russian wheat aphid biotypes virulent to resistant U. S. wheat cultivars

C. Michael Smith1, Tesfay Belay2, Christian Stauffer2, and Petr Stary3. (1) Kansas State University, Department of Entomology, 123 Waters Hall, Manhattan, KS, (2) University of Agricultural Sciences, Institute of Forest Entomology, Forest Pathology & Forest Protection, Hasenauerstr. 38, Vienna, Austria, (3) Institute of Entomology, Academy of Sciences of the Czech Republic, Branisovska 31, Ceske Budejovice, Czech Republic

The Russian wheat aphid has caused nearly $1 billion in losses to barley and wheat production in North America since 1987. Russian wheat aphid resistant wheat cultivars expressing two different Dn (Diuraphis noxia) genes are produced in Colorado and Kansas, but this base of genetic diversity is small. Russian wheat aphid biotypes from Chile, the Czech Republic and Ethiopia are virulent to plants containing the Dn4 resistance gene, the principal source of resistance in all Colorado Russian wheat aphid resistant cultivars. Data presented will demonstrate the reaction of different wheat cultivars possessing different Dn genes for resistance to several geographically different Russian wheat aphid populations.

Species 1: Homoptera Aphididae Diuraphis noxia (Russian wheat aphid)
Keywords: biotype, plant resistance

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