Warning--Be on the Look Out for Herbicide Contamination

Nursery Crops
Growers of ornamental plants were encouraged to monitor for signs of herbicide contamination from several different sources. The four sources of contamination discussed are atmospheric contamination, contamination of growing medium, fertilizer contamination, and water contamination.

Evaluation of Compatible and Oregon Bartletts on Quince

Rootstocks
A discussion involving the propagation of compatible pear rootstock, inter-stock and scions for production. Comparisons of the various varieties were based on overall tree size, compatibility, and yield per tree area for scion-rootstock combinations.

Leaf Browning and Shedding - Arbor-Vitae and Juniper

Plant disorders
Leaf browning and shedding in juniper and arborvitae are addressed in an effort to differentiate between natural causes and disease in the plants. The three fungi discussed can infect the plants and cause extensive damage, they are; leaf-blight (Didymascella thujina), tip-blight (Coryneum berckmannii) and juniper blight (Phomopsis juniperovora).

Measuring a Medium's Airspace and Water Holding Capacity

Container Media
The author addresses how to measure the airspace and water holding capacity of a medium. The method allows the growers to determine water holding capacity for themselves and make the appropriate adjustments to the medium for the water needs of different plants.

The Importance of Selecting a Growth Medium With Adequate Aeration

Container Media
The Oregon State University affiliated author offers incite into the importance of adequate aeration when choosing a growth medium. A few of the topics discussed include; the relationship between oxygen, root growth and plant growth, and symptoms of poor aeration.

What about Phytophthoras in the Pacific Northwest?

Disease
Concerns about Phytophthora and it's impact on the Pacific Northwest nursery industry are discussed. The authors offer incite into the disease itself, control methods, phytophthora prevention in propagation, phytophthora prevention in containers and growing beds, prevention of the disease in the field, and future phytophthora research directions.

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.

Pea Pears Show Ornamental Value

Nursery Crops
Pea pears capture the interest of the author for their use in ornamental horticulture. The pea pear was especially attractive because the pears stayed on the tree and display a variety of fall foliage coloration. Descriptions of various varieties of pear tree size, foliage color, bloom time and other ornamental factors are provided.

Eight Herbicides Rated for Nursery Weed Control

Weeds
Research was carried out on nursery weed control with the use of herbicides. The herbicides were rated according to effectiveness of weed control and amount of plant damage. The weed control tests were conducted on both summer and winter weeds.

Quince Rootstock Used for Dwarf Pears

Rootstocks
An eight year long study was conducted on Quince rootstocks at the Oregon Agricultural Experiment Station. The researchers were looking at varietal compatibility, growth control, effect of interstocks, and resistance to decline.

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