SURVIVAL OF HESSIAN FLY (DIPTERA, CECIDOMYIIDAE) LARVAE ON WHEAT CULTIVARS CARRYING DIFFERENT GENES FOR ANTIBIOSIS

Field and growth chamber tests were conducted to determine which of th e wheat (Triticum) genes that condition antibiosis to Hessian fly, May etiola destructor (Say), allow for larval. survival on resistant plant s. The results showed that the H1H2 genes allowed the highest larval s urvival and the H7H8 genes conditioned an intermediate level of larval survival. Wheats carrying the H3, H5, H6, H9, and H10 genes had low ( <15%) larval survival No larvae survived on resistant plants carrying the H13 gene. Larvae that survived on resistant plants were smaller th an those on susceptible 'Newton' plants. Resistance genes that allow a virulent genotypes td survive on resistant plants should be deployed t o reduce selection for biotype development.