Back to Basics: The Optimum Root Environment

Oregon State University affiliated Drs. Jim Green and David Adams discuss the importance of using an integrated system to provide the best root environment possible. The authors focus on the integration of media, irrigation, and fertilization, specially how the three components effect plant growth.

Irrigation and Oregon Water Laws

Water availability for the upcoming growing season was a concern due to an unusually dry winter. The author discusses the legalities of Oregon water rights regarding greenhouse and nursery crops. Several different types of irrigation permits are addressed along with where to obtain them.

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.

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.

Winter Care of Garden Roses

Plant Disease
The Oregon State University affiliated author focuses the discussion on pest control in garden roses. Specifically addressed are symptoms and controls for "Black Spot", "Powdery Mildew", and "Rust". The three diseases are found on the leaves and new growth of the plants.

Bacterial Disease of Red Maples

Plant Disease
A report on the discovery of a bacterial leaf-spot, a species of Pseudomonas, on cuttings of two different Red maple varieties, 'October Glory' and 'Red Sunset'. The author discusses symptoms of the disease and possible control measures.

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

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.

Phytophthora Crown Rot of Rock Daphne

Plant Disease
A warning to growers of rock daphne (Daphne cneorum) in 1976 after Phytophthora crown rot was detected in rock daphne production fields. Very little was know about the disease at the time but the authors reference a previously published report on Phytophthora as a general guide for growers.