Oregon Pieris Cultivars Tested for Root Hardiness

Breeding and Selection
A report on research conducted by Dr. Davis of the University of Massachusetts testing the root hardiness of several Pieris cultivars released to the nursery industry by Oregon State University. The two Pieris cultivars tested were, 'Valley Valentine' and 'Valley Fire'.

Disease Resistant Pyracantha for the Pacific Northwest

Plant Breeding
The release of disease resistant varieties of Pyracantha for the Pacific Northwest prompted a study investigating the plants resistance to frost, suitable cultural characteristics, and required plant maintenance. The authors discuss the study and it's results.

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.

Six Dwarf Mugo-Pine Cultivars Released

Breeding and Selection
After years of research conducted on Mugo or Swiss Mountain pine, a popular dwarfing shrub used in landscaping, six cultivars were selected to be released to the nursery trade. The selected cultivars were; OSU 67-2, 'Oregon Jade', OSU 67-5, 'Alpenglow', OSU 67-9, 'Elfengren', 67-15, 'Oregon Pixie', OSU 67-20, 'Tyrol', and OSU 69-2, 'Green Candle'.

Simazine Injury on Maple and Other Shade Trees

Plant disorders
Veinal chlorosis in the leaf tips of maple and other shade trees was a persistent problem although it was notice some of the trees out grew the symptoms. Several Acer saccharinum cultivars were used in experiments testing the tolerance of the trees to the herbicide.

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.

Rootstocks for Pear: Variability in Calleryana

Rootstocks
The authors discuss the popular use of Pyrus calleryana as a pear rootstock. Pyrus calleryana did just as well if not better than Bartlett and Winter Nellis in Oregon State University studies. Included in the discussion are the issues growers were having with the rootstock and several possible solutions.

Lophodermium Needle Cast

Plant Disease
Research was conducted to gain incite into the fungal disease, Lophodermium needle cast, affecting Scotch pines in the Pacific Northwest. The most susceptible species were considered to be Scotch pine (Pinus sylvestris), red pine (Pinus resinosa), and Monterey pine (Pinus radiata).

Juniper Decline

Nursery Crops
Junipers were affected by what appeared to be a unknown root disease. Although it was thought to be Phytophthora, because it could not be verified the disease was referred to as "juniper decline". The Oregon State University affiliated authors discuss the disease, it's symptoms, and research being conducted on the subject.

Mugo Pine Cuttings Rooted in June or January

Breeding and Selection
Over a seven year period Mugo pine (Pinus mugo mughus) was researched by the Department of Horticulture at Oregon State University, the project focused on selection and vegetative propagation of Mugo pine. The results led to anticipation of the release of several cultivars varying in appearance.

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