Glassy-winged sharpshooters expected to increase plant disease
AuthorsAlexander H. Purcell
Stuart R. Saunders
Authors AffiliationsA.H. Purcell is Professor, Department of Environmental Science, Policy and Management, UC Berkeley; S.R. Saunders is Staff Research Associate in the Division of Insect Biology, Department of Environmental Science, Policy and Management, UC Berkeley.
Hilgardia 53(2):26-27. DOI:10.3733/ca.v053n02p26. March 1999.
As it moves through California, the new pest known as glassy-winged sharpshooter (GWSS) may significantly increase the spread of plant diseases caused by the bacterium Xylella fastidiosa. The bacterium causes Pierce's disease of grapevines, almond leaf scorch and the newly recognized oleander leaf scorch disease. Currently, almond leaf scorch is a minor problem for California's almonds, but if GWSS becomes established in significant numbers in or near almond orchards, it might increase the incidence of almond leaf scorch. Our studies show that GWSS and two other sharpshooter species can transmit X. fastidiosa from diseased oleanders to healthy oleanders. GWSS also can transmit Pierce's disease strains of the bacterium from grapevine to grapevine and to almond trees. The oleander strain of the bacterium did not infect grapevines, but the ability of GWSS to transmit Pierce's disease strains may increase the spread of this lethal grapevine disease in vineyards bordering citrus orchards or other habitats where invading GWSS may establish permanent populations.
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Also in this issue:Biological studies of iceplant scales, Pulvinariella Mesembryanthemi and Pulvinaria delottoi (Homoptera: Coccidae), in California
Expanded efforts needed to limit exotic pests
Introduction Special section: exotic pest update
AHB headed to Central Valley?
Fire ant invades Southern California
Medfly - going but not gone
Can integrated methods stop starthistle?
Two new seed head flies attack yellow starthistle
New growth regulator herbicide provides excellent control of yellow starthistle
Success of mowing to control yellow starthistle depends on timing and plant's branching form
A new sharpshooter threatens both crops and ornamentals
Early results suggest sterile flies may protect S. California from medfly
Geographic races may exist among perennial grasses
Microsprinklers wet larger soil volume; boost almond yield, tree growth
Improving irrigation systems conserves water in greenhouse-grown cut flowers