J. F. Doyle, Sun Joaquin Valley Agricultural Research and Extension Center, Parlier
H. J. O'reilly, U. C. Davis, Dept. of Agriculture, Victoria, B. C., Canada
G. Nyland, Dept. of Plant Pathology, U.C. Davis
B. Bearden, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
R. Bethell, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
C. Hemstreet, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
G. Morehead, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
S. Sibbett, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
J. Doyle is Pomology Technician, Sun Joaquin Valley Agricultural Research and Extension Center, Parlier. H. J. O'Reilly was Extension Plant Pathologist, U. C. Davis, and is now Provincial Plant Pathologist, British Columbia, Dept. of Agriculture, Victoria, B. C., Canada. G. Nyland is Professor, Dept. of Plant Pathology, U.C. Davis. B. Bearden is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. R. Bethell is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. C. Hemstreet is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. C. Morehead is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. S. Sibbett is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively.
Abstract
Pear decline virus is present in both healthy and weak appearing pear trees on all
common rootstocks in commercial orchards in California. Vigorous condition of any
tree probably results from true tolerance of the rootstock to the disease rather than
the chance that it may have escaped infection. Research suggests a possible relationship
between pear leaf curl and pear decline.
J. F. Doyle, Sun Joaquin Valley Agricultural Research and Extension Center, Parlier
H. J. O'reilly, U. C. Davis, Dept. of Agriculture, Victoria, B. C., Canada
G. Nyland, Dept. of Plant Pathology, U.C. Davis
B. Bearden, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
R. Bethell, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
C. Hemstreet, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
G. Morehead, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
S. Sibbett, Mendocino, El Dorado, Lake, Sacramento and Tulare Counties
J. Doyle is Pomology Technician, Sun Joaquin Valley Agricultural Research and Extension Center, Parlier. H. J. O'Reilly was Extension Plant Pathologist, U. C. Davis, and is now Provincial Plant Pathologist, British Columbia, Dept. of Agriculture, Victoria, B. C., Canada. G. Nyland is Professor, Dept. of Plant Pathology, U.C. Davis. B. Bearden is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. R. Bethell is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. C. Hemstreet is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. C. Morehead is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively. S. Sibbett is Farm Advisor in Mendocino, El Dorado, Lake, Sacramento and Tulare Counties respectively.
Abstract
Pear decline virus is present in both healthy and weak appearing pear trees on all
common rootstocks in commercial orchards in California. Vigorous condition of any
tree probably results from true tolerance of the rootstock to the disease rather than
the chance that it may have escaped infection. Research suggests a possible relationship
between pear leaf curl and pear decline.
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