The Pacific Northwest has become one of the nation’s premier sweet cherry,
Prunus avium, production areas. As production of sweet cherries has flourished in
Oregon and Washington, so has powdery mildew, caused by the fungus
Podosphaera clandestina, which infects both foliage and fruit causing severe
economic damage to growers. Sweet...
Impact of natural infection of common com smut (Ustilago maydis) on processing
characteristics of three F₁ hybrid sweet com (Zea mays L.) cultivars was evaluated in a
two-year study with early and late spring planting dates. At harvest maturity, size and
location of galls were recorded and quality characteristics measured....
A 2-year trial was conducted at Oregon State University's Hermiston Agricultural Research and
Extension Center to examine the effects of spunbonded row cover and supplemental calcium fertilization
on blossom-end rot in two varieties of bell pepper. Blossom-end rot is a common cause of bell pepper yield
losses, especially at the...
Correct identification of pest problems is the beginning of a successful
integrated pest management (IPM) program. Regular scouting can provide early warning of problems, allow the widest range of control options, and bring favorable economic, ecological, and social consequences.
Out of a need, frequently met by the writer and others, for quick reference to more detailed information concerning gross anatomy and life history stages of our Northwestern plant species than generally is to be found in or indeed is appropriate to any local flora, the following pages have been...
Watermelon (Citrullus lanatus (Thunb.) Matsum. & Nakai var.
Crimson Sweet) was seeded in a commercial peat mix in multicell
containers (72 cells-tray⁻¹, 40 cm³-cell⁻¹) in July 1989 and April 1990.
In 1989, the medium was amended with CaC0₃ at 10% w:v. In 1990, no
CaC0₃ amendment was made. Watermelon seedling...
Two types of smut attack corn in the Pacific Northwest: common smut and head smut. This publication provides descriptions of symptoms and the disease cycle, and management strategies (which differ considerably between the two types). There is also significant new information, particularly related to common smut, regarding losses and control...