Grape phylloxera, Daktulosp/iaira vitfoliae (Fitch) development was studied under field and laboratory conditions. The aphid-like insect feeds on Vitis vinfera L. roots producing swellings that decay and lead to vine decline. The only long-term economic solution for control of grape phylloxera (GP) is to plant vines grafted onto a resistant...
Published June 1992. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published November 1995. A more recent revision exists. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Progress Reports for projects: Audio/Visual instruction of canopy management for wine grapes in Oregon, Utilize the northwest berry and grape information network to communicate to Oregon wine grape growers on-farm experimentation techniques (on-line/on-farm), and Publishing of the 2003 pest management guide for wine grapes.
Develop and publish literature to provide up-to-date information on specific topics zDevelop grape grower and County Extension Agent training sessions and short courses zResearch phyiloxera biology in Oregon
Grape phylloxera (Daktulosphaira vitifoliae), a root-feeding aphid-like insect, is the most important pest of European winegrape vineyards worldwide. They cannot be controlled on infested vines which eventually die. There are currently no satisfactory chemical or biological control methods for this pest; its management throughout the world has been by planting...
Since phylloxera's discovery in a commercial vineyard in August of 1990, nine infestations have been verified in Oregon. With over 95% of Oregon's vineyards planted with ownrooted, Vitis vinifera, non-resistant vines, understanding the insect's biology under our conditions has become important for determining management strategies that minimize rate of spread....
Objectives:
· Evaluate canopy management options available to Oregon growers for their effects on yield, grape composition, and wine quality.
· Investigate the relationships between vine growth, cluster environment, grape composition and wine quality.
· Develop techniques that improve the capabilities of Oregon winegrape growers to obtain consistent yields with...
The objectives of this research project are to gain a better understanding of juice/must nutrition and the production of hydrogen sulfide and other 'off' sulfide odors in Oregon wines in relationship to both viticulture and winemaking practices. Specifically, the objectives of this research project are: · To analyze commercial juices/musts...
