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A new greenbug schizaphis graminum biotope



A new greenbug schizaphis graminum biotope



Crop Science 22(4): 847-850



Amigo, a wheat (Triticum aestivum L. em Thell.) germplasm line resistant to the greenbug [S. graminum (Rondani)], and selections from crosses and backcrosses of wheat to Amigo were evaluated from resistance to greenbug collections made each year from 1977-1980. Amigo, its derivatives, and Insave rye (Secale cereale L.) were resistant to these field collections of biotype C greenbugs until Jan. 1980 when Amigo and Amigo derivatives failed to survive a greenbug infestation of progeny of a Nov. 1979 field collection at Bushland, Texas, USA A series of 11 laboratory tests of biotype C-resistant and C-susceptible small grain and sorghum [Sorghum bicolor (L.) Moench] lines infested with either biotype C or the Bushland collections showed the Bushland greenbug to be other than the A, B or C biotype. The Bushland-area greenbug was designated biotype E. Insave rye, Will barley (Hordeum vulgare L.) and biotype C-resistant oats (Avena sativa L.) were resistant to biotype E. Largo, an amphiploid of T. turgidum/T. tauschii, appeared to have useable resistance for breeding biotype E-resistant wheats. Sorghum lines possessing biotype C resistance from tunis grass [S. virgatum (Hack.) Stapf] PI 38108 were susceptible, but sorghums PI 220248 and Capbam were resistant to biotype E and should be useful sources of resistance. Biotype E was the predominant biotype in all greenbug collections made at Bushland, Texas, between Nov. 1979 and Aug. 1980. Biotype E was found 75 miles north of Bushland in May 1980.

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