Boxwood Blight Detected in Oregon For First Time.

Boxwood blight, Cylindrocladium buxicola, a fungal plant disease relatively new to North America, has been detected in an Oregon nursery.

Hearing date set for possible expansion of the Sudden Oak Death (SOD) quarantine area in Southern Oregon.

A hearing is scheduled to discuss proposed changes to the quarantine area and allow use of an oak from disease free area.

Root Death in the Landscape

Nursery Crops
A discussion about the importance of plant root health in the landscape environment and the factors that can influence root system health. The authors address a variety of topics that influence root health ranging from nursery production methods to landscape practices.

Cold Tolerance of Container-grown Green Ash Trees Is Influenced by Nitrogen Fertilizer Type and Rate

Nursery Crops
Container-grown ‘Summit’ green ash (Fraxinus pennsylvanica) trees were used in a recent study in an effort to determine whether cold tolerance of the tree's buds and stems are related to nitrogen (N) application rate and fertilizer form.

Spraying Leaves of Pear Nursery Trees with Urea and Copper Ethylenediaminetetraacetic Acid Alters Tree Nitrogen Concentration without Influencing Tree Susceptibility to Phytophthora syringae

Nursery Crops
An investigation was conducted into the increased susceptibility of pear nursery trees to infection by Phytophthora syringae following fall foliar sprays of urea which increased nitrogen (N) content in the trees. The authors discuss the methods and materials involved in the experiments along with the results.

Tree Growth Stage and Environment After Pathogen Inoculation Alters Susceptibility of Pear Trees to Phytophthora Canker

Nursery Crops
The results of an investigation on pear (Pyrus communis L. OHF97) to determine whether specific factors influence the tree's susceptibility to Phytophthora syringae Klebahn. The factors included tree growth stage, nitrogen (N) status, wound age, and infection environment.

Grass in the Nursery?

Management
A discussion about the use of grass in between rhododendron field plantings in the nursery environment for weed suppression, improved water drainage, and mud control. The types of grass covered include; perennial ryegrass, tall fescue, red fescue, hard fescue, chewings fescue, colonial bentgrass, kentucky bluegrass, and annual bluegrass.

Complementary, Field Plantings: Grass and Nursery Plants

Nursery Crops
The Oregon State University affiliated author examines the practice of complementary field plantings and the various benefits of the practice. A list is provided that includes multiple practical ideas for growers to incorporate into their operations for increased efficiency.

Three Major Foliar Pathogens of Poplar

Plant Disease
A discussion about the three major foliar pathogens of poplar trees identified in the Pacific Northwest; rust, Marssonina leaf spot, and shoot blight. The discussion includes descriptions of the pathogens, damage, life cycle, and controls for two of the pathogens mentioned.

The Columbia Root-Knot Nematode Problem

Management
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.

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