Bird cherry - oat aphid bionomics in the Pacific Northwest USA.
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Barley Yellow Dwarf Virus is a yield reducing disease vectored by the Bird-Cherry Oat Aphid (Rosalosiphum padi) in the fall. The aphid brings the virus to wheat and barley from inected sweet corn fields. Recently a flare of R. padi damaged wheat. The symptoms vary by variety and may not be seen in the spring.