Abstract
The spatial pattern of Pierce's disease of grapevines was studiied by mapping diseased grapevines in eight vineyard plots in the Napa Valley, California. The percentage of diseased vines was highest nearest natural riparian vegetation, declining with distance (up to 400 to 500 ft) from natural source areas of the principal leafhopper vector, Hordnia circellata (Baker). The slope of disease dispersal gradients annual changes in apparent infection rate, and the overall incidence of Pierce's disease varied among grape varieties in adjacent plantings with similar exposure to vector source areas.
- Copyright 1974 by the American Society for Enology and Viticulture
Sign in for ASEV members
ASEV Members, please sign in at ASEV to access the journal online.
Sign in for Institutional and Non-member Subscribers
Log in using your username and password
Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00
Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.
Vol 25 Issue 3
Jump to section
Related Articles
Cited By...
More from this TOC section
Similar Articles
