'Plant Breeding: Sustaining the Future' Abstracts of the XVIth EUCARPIA Congress, Edinburgh, Scotland, 10-14 September 2001 GENETICS OF GREENBUG RESISTANCE IN SORGHUM E.E. RADCHENKO, N.S. LYCHAGINA Vavilov Institute of Plant Industry, St Petersburg, 190000 Russia

The greenbug, Schizphis graminum Rond, is a key pest of Sorghum.  Differential interaction of greenbug with major and minor genes for resistance in Sorghum is shown.  Consequently, aphid adaptation doe not depend on phenotypic expression and genetic control of resistance.  Resistant varieties with various genetic bases should be cultivated.  Greenbug resistance was studied in more than 6 thousand samples and 25 highly resistant lines were isolated.  Inheritance study of some samples resulted in identification of 11 genes for greenbug resistance.  Genes Sgr5-Sgr11 was not used in breeding and, with the exception of Sgr6, they are effective against the pest populations from Russia.