Cultural Practices for the Management of Plant Parasitic Nematodes

Information provided on cultural pest management practices for control of plant parasitic nematodes in the nursery industry. The main topics of discussion include; nematode identification, crop rotation, fallowing, weed control, resistant plant material, soil amendments, and sanitation.

Desiccation Control of Bare Root Stock

Post Harvest
The Michigan State University affiliated author addresses the issue of desiccation of bare-root nursery stock. Topics of discussion include; conditions that increase the probability of desiccation, most susceptible phases for bare-root stock desiccation, and control methods.

Update on Tomato Spotted Wilt Virus

Greenhouse Crops
Increasing number of reports of greenhouse crops displaying symptoms of tomato spotted wilt virus (TSWV) prompted the authors to address the issue. Topics discussed are; the history of TSWV in the US, the wide variety of ornamental and non-ornamental hosts, symptoms, and control.

Symptoms of Stephanotis Infected With Tomato Spotted Wilt Virus

Greenhouse Crops
Discussion about the discovery of tomato spotted wilt virus found to be infecting the greenhouse crop Stephanotis floribunda Brongn. The Oregon State University affiliated authors include when the disease was first noticed in Oregon greenhouses and a description of the symptoms.

Tomato Spotted Wilt Virus in Greenhouse Crops

Greenhouse Crops
A brief report on tomato spotted wilt virus (TSWV). The discussion focuses on host plants for the disease, which includes a wide range of flowering greenhouse crops, common weed hosts, and vegetable crops. The author also addresses transmission and control of TSWV.

Xylella fastidiosa, A Newly Named Bacterium, Causes Leaf Scorch on Several Shade and Fruit Trees

Plant Disease
Information on the bacterium Xylella fastidiosa which is closely related to Xanthomonas. Xylella fastidiosa was found in the following shade and fruit trees; American elm, American sycamore, red oak, red maple, mulberry, periwinkle, grape, almond, plum, peach and from ragweed.

Controlling Moss in Lawns

Mossy lawns are common in the Pacific Northwest. Two mosses typically found invading Western Oregon lawns are Rhytidiadelphus sp. and Brachythecium albicans. Cultural, mechanical, and chemical control methods are offered as a guide to help control moss in lawns.

Searching for Perfect Turf

Informative look at lawn grass selection, popular grass species, and management practices. Specific grass species discussed includes tall fescue, fine fescue, Kentucky bluegrass, perennial ryegrass, bentgrass, highland bentgrass, colonial bentgrass, Poa trivialis, Poa annua, and Holcus lanatus.

Sporotrichosis, A Skin Disease Caused by the Fungus Sporotrichum schenckii

Dr. James Green, a horticulture extension specialist affiliated with Oregon State University, discusses the skin disease Sporotrichosis. The disease is caused by the fungus Sporotrichum schenckii and is usually transmitted in sphagnum moss but can also be found in nursery soils, flowers, shrubs, and lumber.

Chemical Growth Regulators

Report on chemical growth regulators for use in greenhouse and nursery crop production. Studies were conducted to determined the effectiveness of the growth regulators on the following crops; zonal geraniums, hibiscus, hydrangea, kalanchoe, weeping fig, several trees species, poinsettias, Easter lilies, and freesia.