Seasonal synchrony between the filbert aphid,
Myzocallis coryli (Goetze) and its newly introduced
parasitoid Trioxys pallidus Haliday was examined in the
field to evaluate the effectiveness of parasitoid based
biological control in filbert orchards of Oregon. Fieldemergence
observations showed that 50% eclosion of the aphid
occurred 14 days before that...
The European hazelnut, Corylus avellana L., was imported into the U.S. in the late 1800's and is now grown throughout the Willamette Valley in Oregon. A native species of hazelnut, C. cornuta Marshall, is a common shrub found in forested areas of the Pacific Northwest. Foliage of both C. avellana...
A parasitic wasp, Trioxys pallidus Haliday
(Hymenoptera: Aphidiidae) was imported from Europe and
initially released against the filbert aphid Mvzocallis
coryli (Goetze) in hazelnut (filbert) orchards of the
Willamette Valley, Oregon beginning in 1984. In the
present study, I investigated the establishment rates of
this parasitoid. A total of 13...
European hazelnut is a significant crop in the Pacific Northwest, and the US ranks
4th internationally for hazelnut production. Production in the Pacific Northwest is
threatened, however, by the disease eastern filbert blight (EFB) caused by the fungus
Anisogramma anomala (Peck) E. Müller. To meet the challenges faced by the...
The publication provides vineyard owners with approaches for finding the first occurrence of grape powdery mildew. The publication covers tactics to manage powdery mildew, including use of fungicides and canopy management. It also discusses effective scouting techniques based on the key characteristics of the fungus.
The insects that invade a dying or dead tree are the immediate cause of death and the principle mediators of early stages of decomposition of the tree. These insects form a large and complex community, the species
components of which are restricted to particular habitats. A study of
the insect...
Mealybugs, a family of soft, oval-bodied pests (Homoptera: Pseudococcidae), are known vectors (carriers) of the grapevine leafroll associated viruses (GLRaVs) of grape. This document gives details on how pheromone traps should be used to ensure optimal catches and early detection.
Published May 1934. 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