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 relationship between pea enation mosaic virus
(PEMV) and aging pea aphids was studied. Although this
research initially emphasized the relationship between the
decline in the rate of PEMV transmission and the 'concentration
of PEMV within pea aphids, aphid age was found to be
the principle factor influencing transmission. Enzymelinked...
Published August 1987. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published May 1929. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko),
is a widely distributed species in western north America,
and a major economic pest of wheat (Triticum aestivum L.)
and barley (Hordeum vulgare L.). The objectives of this
study were to : 1) determine the inheritance of seedling and
adult plant resistances in...
In recent years, red raspberry production in Washington and British Columbia has been severely limited by a newly emerged virus complex that causes symptoms of crumbly fruit. The complex is comprised of three viruses: Raspberry bushy dwarf virus (RBDV), Raspberry leaf mottle virus (RLMV) and Raspberry latent virus (RpLV). Both...
Modeling and analyzing the combined effects of disease and population dynamics
is important in understanding the effects of mechanisms such as pathogen transmission
and direct competition between host species on the distribution and abundance of different
species in an ecological community. Mathematical analysis of such models in a
spatially explicit...