The Woolly Apple Aphid Eriosoma Lanigerum

A discussion about the apple tree pest, the woolly apple aphid (Eriosoma lanigerum), by an Oregon State University affiliated entomologist. Topics include; descriptions, behavior, association with canker, life cycle, natural control, and chemical control.

Apple Maggot (Rhagoletis pomonella)

The apple maggot was detected on a homeowner's tree in the Portland, OR area in the late summer of 1979 and was again detected on other noncommercial plantings the following year. Apple maggot hosts, damage, detection and control are addressed by the author.

Gypsy Moth in Washington

The gypsy moth was detected in the Seattle, WA area in 1977 using pheromone (female sex scent) traps. The author discusses the gypsy moth in regard to; local history, the problem involving gypsy moths, eradication efforts, and the efforts nurseries could make.

Gypsy Moth in Oregon

Gypsy moth, Porthetria dispar, the invasive pest of trees and shrubs was trapped for the first time in Oregon in the summer of 1979. The author discusses the moth's lifecycle, history in the US, efforts made to educate the public, and the plan for the following year.

Pear Rootstocks - General Characteristics, Principle Limitations

A table put together by Robert Stebbins, an extension tree fruit and nut specialist in affiliation with Oregon State University. The table provides information on a variety of pear rootstocks, the general characteristics of the rootstock and limitations of the rootstock.

Symptoms and Control of Botrytis on Statice

Plant Disease
Botrytis blight, a plant disease caused by Botrytis cinerea Pers. ex Fr., on statice (Limonium sinuatum Mill,) was studied by the University of Florida. The following topics are discussed; symptoms, seeds, field planting, and cultural and chemical control.

The Basis of Obscure Root Weevil Resistance in Rhododendron--Some Thoughts on the Reasons for Investigating the Resistance of Plants to Insects

Studies were conducted to test the resistance of rhododendron species to foliar feeding by the obscure root weevil. The author discusses the results of the rhododendron study and addresses the importance of studying plants resistance to insects.

Differential Feeding on Rhododendron by Adult Root Weevils

Field studies were conducted to determine if adult root weevils feed on certain cultivars of rhododendron more than other cultivars. The author discusses the methods and results of the studies, including the difference in resistance of the cultivars used.

Defoliation by Winter Moth - A Pest New to the Pacific Northwest

A discussion about the history and discovery of the winter moth, Operophtera brumata, in Oregon State University and Oregon Department of Agriculture Entomology collections taken from the Portland, OR area. Appearance, damage, and life history are addressed.

Insects Have Defoliated My Tree - Now What's Going to Happen?

The USDA affiliated author addresses the issue of tree defoliation and re-foliation. Information is provided on the following topics regarding defoliation; the factors that influence tree defoliation, the effects of defoliation, and tree care.