Silver-Spotted Tiger Moths on Conifers

The silver-spotted tiger moth, Halisidota argentata, belongs to a family of stout bodied moths which can be pests of conifers, causing loss of harvestable trees for Christmas tree growers. Lifecycle, habitat, appearance, and control methods are briefly addressed.

Grovesiella Abieticola - Associated With a Canker Disease of True Firs

Grovesiella canker caused by the fungus Grovesiella abieticola was known to infect True fir in Northern California and B.C. Canada but was discovered on Noble fir Christmas tree farms in Western Oregon and Washington in the mid-1980's. Descriptions of the fungus and control methods are included in the article.

Swiss Needle Cast of Douglas-Fir

Plant Disease
Swiss needle cast (Phaeocryptopus gaumanni) is a fungal disease of Douglas-fir trees, native to the North American pacific coast, which causes needle and color loss. Topics discussed include, winter-spring symptoms, summer-fall symptoms, and control.

Pest News--Black Vine Weevil: An Increasing Problem for California Nurseries

Research was conducted on the distribution and chemical control of the black vine weevil in California nurseries after an increasing number of California nurseries were reporting control problems and damage associated with the black vine weevil.

Botrytis Cinerea

Plant Disease
Botrytis blight ( Botrytis cinerea), also known as grey mold, is one of the common diseases of greenhouse crops. Descriptions of general symptoms and symptoms on flowers, leaves, seedlings, and stems are provided along with cultural and chemical management programs.

Root Weevil Update

Information provided on an Oregon State University affiliated study conducted on root weevils and chemical control methods. The authors provide tables highlighting the results of the study for the foliar chemical applications and drench chemical applications.

Controlling Weeds in Container-Grown Nursery Plants

Washington State University affiliated author discusses the results of a six year study on the use of specific chemicals for weed control and their effects on both the weeds and the nursery plant in container-grown nursery plant production.

Chemical Application of Pesticides Using Spray Equipment

A summary of Dr. Frank Hall's presentation at the 1984 NW Ag Show in Portland, OR on chemical application of pesticides. Topics addressed in the summary include; spray deposition, importance of accuracy, methods, nozzle size, and nozzle calibration.

The Brown Garden Snail

A discussion about the brown garden snail, Helix aspersa, common in England, western Europe, California, and now Oregon. The Oregon State University affiliated author offers physical descriptions, a brief history, life cycle, and habits of Helix aspersa.

Boxwood Blight Detected in Oregon For First Time.

Boxwood blight, Cylindrocladium buxicola, a fungal plant disease relatively new to North America, has been detected in an Oregon nursery.