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A New Greenbug Biotype 1
Author(s) -
Porter K. B.,
Peterson G. L.,
Vise O.
Publication year - 1982
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1982.0011183x002200040035x
Subject(s) - biology , sorghum , germplasm , hordeum vulgare , poaceae , agronomy , secale , infestation , horticulture , botany
‘Amigo’, a wheat ( Triticum aestivum L. em Thell.) germplasm line resistant to the greenbug [ Schizaphis graminum (Rondani)], and selections from crosses and backcrosses of wheat to Amigo were evaluated for resistance to greenbug collections made each year from 1977 to 1980. Amigo, its derivatives, and ‘Insave’ rye ( Secale cereale L.) were resistant to these field collections of biotype C greenbugs until January 1980 when Amigo and Amigo derivatives failed to survive a greenbug infestation of progeny of a November 1979 field collection at Bushland, Tex. 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 clearly showed the Bushland greenbug to be other than the A, B, or C biotype. The Bushlandarea 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 [ Sorghum 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 predominanbt iotype in all greenbugc ollections made at Bushland, Tex., between November 1979 and August 1980. Biotype E was found 75 miles north of Bushland in May 1980.