One of Our Under-Utilized Insecticides - Horticultural Spray Oils

A discussion about the use of horticultural sprays and their effectiveness in controlling a wide variety of pests. The Oregon State University affiliated authors include the specifications for superior oils and the traditional caution statements.

Douglas-Fir Needle Midge...Determining a Spray Schedule Through Use of a Midge Trap

Christmas Tree
Douglas-fir needle midges are discussed in regard to their impact on Christmas tree production. The topics specifically addressed are; midge descriptions, building emergence traps, chemical control, cultural control, physical control, and biological control.

The Columbia Root-Knot Nematode Problem

In 1982, new regulations were put in place by Canada in an attempt to limit the Columbia root-knot nematode from spreading to Canada. In regard to the nematode, the author discusses; the problem, distribution, habitat, life cycle, hosts, and controls.

Pine Needle Sheath Mite Damages Ornamental Pines in the Pacific Northwest

The pine needle sheath mite, Trisetacus campnodus (Acarina: Eriophyidae), was reported to be causing damage first on plantation scotch pine. The mite was then discovered on two other pines, black pine (Pinus nigra), and cluster pine (Pinus pinaster).

The Western Spruce Budworm Strikes Again!

The western spruce budworm (Choristoneura occidentalis Freeman), a native Oregon insect, is the subject of discussion. The author addresses the history of the pest in Oregon, life cycle, damage caused, controls, and plans to implement a spray program.

Weed Control in Nurseries and Ornamental Plantings

A partial list of herbicides for perennial weed control intended for nurseries and ornamental plantings. The author addresses correct weed identification, weeds controlled and not controlled by the herbicides, terms used in weed control, and application methods.

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.

Factors to Consider Before Tank Mixing Pesticides

The dangers of tank mixing pesticides are addressed by the University of California affiliated author. The factors discussed include; chemical incompatibilities, physical incompatibilities, general principles for mixing pesticides, specific mixtures to avoid, and causes of phytotoxicity.

Follow Up on Mugo-Pine Cultivars Released by OSU in 1976

Breeding and Selection
A brief description of each of the six dwarf mugo-pines, Pinus mugo mughus, released to licensed nurserymen after years of research and cultivar selection. The author was looking for responses to a series of questions he had regarding the six mugo-pine cultivars.