Skip to main content
ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Research Unit » Research » Publications at this Location » Publication #97164
Title: STATUS OF GRAPE PHYLLOXERA IN OREGON

Author
item Fisher, James
item HELLMAN, EDWARD - OREGON STATE UNIVERSITY

Submitted to: Entomology Society of America Pacific Branch Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 3/10/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Grape phylloxera have been known to occur in Oregon since the 1960#s. Commercial wine grape production started in 1970-1971 with <100A. By 1990 there were >5000A in European wine grape production with >7800A today. In 1990 grape phylloxera damage was reported from 3 vineyards with visible damage to <5A with a potential to affect 50A adjacent. In 1997 we confirmed phylloxera damage in 26 vineyards with another 15 possible affected vineyards (not inspected). The extent of damage ranges from <10 plants to >100A in a single vineyard. In all >540A are in direct contact with these affected areas. With >5500A in 'own-rooted' vines there may be more problems in the future. The only prevention for damage from this insect is to plant grapes that are on phylloxera resistant rootstock. Infestations have been found in 4 of the 5 Oregon grape appellations; the majority in the North and South Willamette appellations (the major concentration of vineyards in the state). Affected vineyards range in age from 7 to 20 years; a majority 10-15 years old. Spread of infestation in affected vineyards has been variable and has shown no definitive trends. Actions taken after infestation have been: removal of the vineyard, total replanting or interplanting of resistant rootstock, and attempts at damage alleviation through actions that would produce more vigorous plants.