| Barley yellow dwarf virus is one of the most widespread viral diseases of wheat. Yield reductions up to 70% have resulted from barley yellow dwarf virus (BYDV) infection. Several aphid spp. transmit BYDV. In Missouri, the four common aphids that transmit BYDV are: Rhopalosiphum padi (L.), Schizaphis graminum (Rondani), Sitobion avenae (F.), and Rhopalosiphum maidis (L.). Warm winters have increased the incidence of BYD, triggering producer interest in controlling the aphid vectors. In addition, a species shift in cereal aphids in Missouri has caused previous thresholds to become outdated. For this reason yield loss in soft red winter wheat caused by aphid transmission of barley yellow dwarf virus was measured over a two-year period in central Missouri. The experimental design was a randomized complete block factorial with four replications. The plot factors were variety, seed treatment, and foliar insecticide treatment timings. The four wheat varieties utilized were: 'Truman', 'Ernie', 'Roane', and 'Pioneer 25R37'. (Abstract shortened by UMI.)... |
