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Thesis - University Access Only
Master of Science (MS)
Robert W. Kieckhefer
In South Dakota, winter wheat, Triticum aestivum (L.), is normally sown in. September. After emergence, the plants are frequently infested with cereal aphids. They will survive and reproduce on the seedling wheat until killing, subfreezing temperatures occur, typically in mid-November. The bird cherry oat aphid (BCO), Rhopalosiphum padi (L.), is a major species involved in these autumn infestations. Infestations in the autumn by BCO are known to reduce yield in winter wheat. In addition, BCO is a known vector of the barley yellow dwarf virus (BYDV) which can cause substantial yield losses in wheat. Winter survival is a major limitation to growing winter wheat in the state. Since winter-hardy cultivars tend to yield less than nonwinter-hardy cultivars under mild growing conditions, growers throughout the state plant cultivars with an array of winterhardiness levels in an attempt to maximize winter survival and yield. The interaction of level of winterhardiness a cultivar possesses with tolerance to fall aphid feeding and BYDV inoculation is not known for yield and other agronomic traits. The objective of this research was to assess the effect of fall aphid feeding and BYDV inoculation on seed and plant yield, tiller number, and mature plant height in winter wheat cultivars differing in level of winterhardiness.
Library of Congress Subject Headings
Aphids as carriers of disease
Winter wheat -- Diseases and pests
Rye -- Diseases and pests
Barley yellow dwarf viruses
Number of Pages
South Dakota State University
Moreno, Benjamin, "Effects of Barley Yellow Dwarf and Aphid Feeding on Winter Wheat and Rye" (1989). Electronic Theses and Dissertations. 4609.