The purpose of this study was to determine the relative resistance
of genetic lines of hops, Humulus lupulus (Linn.) to the
two-spotted spider mite, Tetranychus urticae (Koch) in western
Oregon.
Approximately three-hundred genetic lines of hops were
screened under insectory conditions during the 1965 growing season
at Corvallis, Oregon. Reduction...
The purpose of this study was to determine the present status
of introduced parasites of the omnivorous leaf tier, Cnephasia
longana (Haworth) in Oregon.
The omnivorous leaf tier is native to Europe. It was introduced
into North America around 1929 and became a serious pest of economic
crops such as...
This study was initiated in the Spring of 1966 for the purpose of
determining the present status and effectiveness of imported parasitic
wasps of the pea aphid in the Willamette Valley of western Oregon.
The pea aphid is a serious pest throughout the pea and alfalfa
growing regions of the...