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...
The sinuous flight behavior of male Douglas-fir tussock
moths, Orgyia pseudotsugata, (McD.), is characterized by
positive anemotaxis and positive chemoklinotaxis and varies
depending on distance from the pheromone source, population
density, and time of day. Visual cues play a minor role
in close-range orientation to a pheromone source, but
males...
Several aspects affecting population trends and overwintering of Neoseiulus
fallacis (Garman) on peppermint were examined. Neoseiulus fallacis was the most
abundant phytoseiid predator mite found in peppermint surveys throughout the western U.S. Results of pesticide exclusion and cage studies showed that N. fallacis controlled Tetranychus urticae (Koch) on peppermint in...
