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ARS Home » Pacific West Area » Parlier, California » San Joaquin Valley Agricultural Sciences Center » Crop Diseases, Pests and Genetics Research » Research » Publications at this Location » Publication #163360
Title: THE EFFECTS OF KAOLIN, HARPIN, AND IMIDACLOPRID ON DEVELOPMENT OF PIERCE'S DISEASE IN GRAPE

Author
item Tubajika, Kayimbi
item Civerolo, Edwin
item LUVISI, D - UCCE-BAKERSFIELD
item HASHIM, J - UCCE-BAKERSFIELD

Submitted to: Crop Protection
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/5/2006
Publication Date: 4/6/2006
Citation: Tubajika, K.M., Civerolo, E.L., Luvisi, D.A., Hashim, J.M. 2006. The Effects of Kaolin, Harpin, and Imidacloprid on Development of Pierce's Disease in Grape. Crop Protection Journal. Available: http://directscience.com. doi:10.1016.j/cropro.2006.04.006

Interpretive Summary: Incidence of Pierce's disease (PD), caused by the bacterium Xylella fastidiosa, continues to increase in many vineyards in California due to the establishment and spread of the vector Homalodisca coagulata (Glassy-winged sharpshooter). Commercially available materials [particle film (Surround WP)], harpin-containing Messenger and Admire 2F were evaluated in greenhouse and field experiments, for their ability to reduce X. fastidiosa transmission,and reduce X. fastidiosa infections and PD development. In the greenhouse tests, PD incidence was reduced by 30%, 42% and 42% with Admire 2F, harpin and Surround WP, respectively. Treatment of grapevines with harpin, Surround WP, and Admire 2F reduced transmission of X. fastidiosa by 11%, 9%, and 11%, respectively, in treated grape plants maintained in the greenhouse. Infield studies, PD incidence was 6% in Surround WP treated plots and 14% in conventional insecticide treated plots. PD development in harpin treated plots was 13%, 7%, and 6% when 160, 320, and 460g harpin a.i./ha were used respectively. PD incidence in untreated control plants was 19%. Results from both greenhouse and field studies show that harpin, Surround WP, and Admire 2F would be useful in reducing transmission of X. fastidiosa by GWSS and in reducing infections and PD development.

Technical Abstract: Incidence of Pierce's disease (PD), caused by the bacterium Xylella fastidiosa, continues to increase in many vineyards in California due to the establishment and spread of the vector Homalodisca coagulata (Say) (Glassy-winged sharpshooter). Commercially available materials [particle file (Surround WP) containing 95% kaolin, systemic acquired resistance inducer (Messenger) containing 3% harpin], and Admire 2F (imidacloprid) were evaluated in greenhouse and field experiments, for their effects on reducing X. fastidiosa transmission, and reducing X. fastidiosa infections and PD development. In the greenhouse tests, PD incidence was reduced by 30%, 42%, and 42% with Admire 2F, harpin and Surround WP, respectively. Treatment of grapevines with harpin, Surround WP, and Admire 2F reduced transmission of X. fastidiosa by 11%, 9%, and 11%, respectively, in treated grape plants maintained in the greenhouse. Infield studies, PD incidence was 6% in Surround WP treated plots and 14% in convential insecticide treated plots. PD development in harpin treated plots was 13%, 7%, and 6% when 160, 320, and 460 g harpin a.i./ha were used respectively. PD incidence in untreated control plants was 19%. harpin treated plants grew more vigorously than plants treated with Surround WP and Admire 2F, and untreated control plants. Higher GWSS mortality rates were observed on plants treated with Surround WP. Results from both greenhouse and field studies show that harpin, Surround WP, and Admire 2F would be useful in reducing transmission of X. fastidiosa by GWSS and in reducing infections and PD development.