|May Iii, Oscar|
Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 11/15/1996
Publication Date: N/A
Technical Abstract: Two cycles of mass selection for bollworm/tobacco budworm resistance were conducted in two populations derived from crosses between resistant Pee Dee germplasm and 'Stoneville 69132'. Variation for bollworm/budworm damaged squares and bolls among the selection cycles was small and not significant indicating no progress in improving resistance. In accomplishing mass selection, frego bract plants were not selected and this may explain why we could not further exploit the bollworm/budworm resistance found in the Pee Dee germplasm. An important finding was that the Pee Dee germplasm line PD 0786 suffered significantly less square damage and harbored fewer bollworm/budworm larvae than susceptible 'Coker 315' when no insecticide was applied for bollworm/budworm control. Pee Dee germplasm had previously exhibited resistance only under a reduced insecticide production system. This may have application in production systems utilizing Bt cotton.