Index Catalog // ScholarsArchive@OSU

Creator:: Willett, Mike and Westigard, Peter H.
Abstract:: Petroleum oils have been used to suppress insect and mite pests for 100 years. Beginning in the 1880's, when kerosene was first used to control scale and aphids, to the present use of highly refined petroleum derivatives, these products have provided growers with a unique tool in their battle against...
Resource Type:: Technical Report
Full Text:: Peter H. Westigard, professor of entomol- ogy, Southern Oregon Experiment Station, Oregon State

Creator:: Hilton, Richard and Westigard, Peter H.
Resource Type:: Conference Proceeding
Full Text:: Pear Psylla and Twospotted Spider Mite, Pear Richard Hilton and Peter Westigard Oregon State

Creator:: Hilton, Richard and Westigard, Peter H.
Resource Type:: Conference Proceeding
Full Text:: Richard Hilton and Peter Westigard Oregon State University Southern Oregon Experiment Station Medford, OR

Creator:: Westigard, Peter H. and Zwick, Robert Ward, 1922-
Abstract:: Since its discovery in Oregon in 1946, the pear psylla, Psylla pyricola Forster, has become the most serious insect pest of pear. Damage to pear trees include the transmission of pear decline disease which has caused losses of trees, injection of a phytotoxic toxin resulting in tree shock and injury,...
Resource Type:: Technical Report
Full Text:: Corvallis, Oregon November 1972 TH IS P UB LIC AT IO N IS O UT O F D AT E. Fo r m os t c

Creator:: Hilton, Richard, VanBuskirk, Philip, and Westigard, Peter H.
Resource Type:: Conference Proceeding
Full Text:: EVALUATIONS Richard Hilton, Philip VanBuskirk, and Peter Westigard OSU Southern Oregon Research & Extension

Creator:: VanBuskirk, Philip, Hilton, Richard, and Westigard, Peter H.
Resource Type:: Conference Proceeding
Full Text:: complex on pear Philip VanBuskirk, Richard Hilton, and Peter Westigard OSU Southern Oregon Research and

Creator:: VanBuskirk, Philip, Hilton, Richard, and Westigard, Peter H.
Resource Type:: Conference Proceeding
Full Text:: Philip VanBuskirk, Richard Hilton, Peter Westigard OSU Southern Oregon Research & Extension Center

Creator:: Westigard, Peter H., Lombard, P. B. (Porter B.), and Berry, Donald W.
Abstract:: Published November 1967. 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
Resource Type:: Technical Report
Full Text:: ti 7 Y A l y K c 1 t r= r r r I r -' Y 1

ScholarsArchive@OSU