Lilac...Year-Round Cut Flower? Duel Purpose Plant?

Greenhouse Crops
A guide for the production of lilacs for the duel purposes of cut-flower production and landscape plantings. The history of the lilac as a forced, cut flower is summarized along with descriptions of species and cultivars, growth and development, forcing and flowering, and propagation methods.

The Woolly Apple Aphid Eriosoma Lanigerum

Insects
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)

Insects
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.

Factors to Consider Before Tank Mixing Pesticides

Management
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.

Just How Often do You Need to Water?

Irrigation
Research was conducted by University of Idaho affiliated horticulturists answered concerns raised about the water shortage and how often to irrigate orchards. The types of trees used in the study were; Red Delicious, Rome Beauty and Jonathan apple trees and Italian prune trees.

Disease Control for Perennial Plants

Plant Disease
The Oregon State University affiliated author discusses implementing preventative disease control programs for a wide variety of perennial plants. A list is provided of the many different perennials grown in the pacific northwest and the diseases they are commonly associated with.

Status of the European Shoot Moth in Oregon

Insects
A brief history of the invasive pest European pine shoot moth, Rhyacionia buoliana (Schiff.), in Oregon. Surveyed Oregon counties found to have infestations were; Clackamas, Lane, Marion, Multnomah and Umatilla. Control methods for the moth are discussed along with descriptions of the life cycle and damage caused by the moths.

35 Years of Specialty Horticultural Research

Nursery Crops
The results of 35 years of horticultural research in nursery and ornamental crops conducted at and in affiliation with Oregon State University are discussed. Topics include; defoliation problems, gladiolus, new crop development, lilies, holly, wood waste utilization, ornamental plant nutrition, graduate research assistance, rose and tree fruit rootstock research, ornamental research, root regeneration, propagation research, and plant growth research.

Horticultural Crops Research Needed for the 1970's

Nursery Crops
Based on a previous article calling for research in the ornamental crops industry in Oregon, the authors elaborate on what ornamental and horticultural areas need more research. Specific crops are listed along with the most pertinent areas for each crop needing more research.

Early Defoliation May Harm Plants

Plant Stress
An experiment was conducted by the author on red-oiser dogwood plants to determine the importance of early defoliation. Leaf removal and its role in dormancy and cold hardiness are explained by the author in an effort to clarify the effect of early defoliation on plants.

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