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Article

Evaluation of Pruning Wound Susceptibility and Protection Against Fungi Associated with Grapevine Trunk Diseases

Philippe E. Rolshausen, José Ramón Úrbez-Torres, Suzanne Rooney-Latham, Akif Eskalen, Rhonda J. Smith, Walter Douglas Gubler
Am J Enol Vitic. March 2010 61: 113-119; published ahead of print March 01, 2010 ; DOI: 10.5344/ajev.2010.61.1.113
Philippe E. Rolshausen
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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José Ramón Úrbez-Torres
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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Suzanne Rooney-Latham
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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Akif Eskalen
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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Rhonda J. Smith
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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Walter Douglas Gubler
1Professional researcher, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 2Postdoctoral researcher, Department of Plant Pathology, University of California, Davis, CA 95616; 3Senior plant pathologist, California Department of Food and Agriculture, Plant Health and Pest Prevention Services, Sacramento, CA 95832; 4Cooperative extension specialist, Department of Plant Pathology and Microbiology, University of California, Riverside, CA 92521; 5Viticulture farm advisor, University of California Cooperative Extension, Sonoma County, Santa Rosa, CA 95403; and 6Cooperative extension specialist, Department of Plant Pathology, University of California, Davis, CA 95616.
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  • For correspondence: wdgubler@ucdavis.edu
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Abstract

Trunk diseases diminish vineyard longevity and productivity in nearly every raisin, table, and wine grape production region worldwide. Fungi causing these diseases infect primarily through pruning wounds. One way to control these diseases is to protect pruning wounds with fungicide applications, which can be problematic because of the limited number of registered products; the difficulty for these products to control numerous taxonomically unrelated organisms; the challenge of these products to protect for the entire period of wound susceptibility; and the difficulties and costs associated with hand application of protection treatments. Our goal was to compare the susceptibility of grapevine pruning wounds to various fungi associated with trunk diseases and to evaluate the efficacy of selected fungicides to control these pathogens when applied as pruning wound protectants. The study was conducted over two consecutive years in two separate vineyards in Sonoma and Colusa counties, California. Nine pathogenic fungi were tested: Eutypa lata, Botryosphaeria dothidea, Diplodia seriata, Dothiorella viticola, Lasodiplodia theobromae, Phaeomoniella chlamydospora, Pleurostomophora richardsiae, Togninia minima, and Phaeoacremonium parasiticum. Results showed differences in the infection rates of pruning wounds by these fungi. Species of Botryosphaeriaceae were the most infectious, T. minima, P. parasiticum, P. richardsiae, and E. lata were less infectious, and Pa. chlamydospora was intermediate. Four selected fungicides were tested: 1% Topsin M, Biopaste (5% boric acid in a wound-sealing paste), 1% Cabrio EG, and Garrison. Although results highlight the difficulty of these products to control the entire spectrum of pathogens efficiently, Topsin M was overall the most efficacious product.

  • Eutypa dieback
  • Bot canker
  • black dead arm
  • esca
  • Petri disease
  • young vine decline
  • Received July 2009.
  • Revision received November 2009.
  • Accepted November 2009.
  • Copyright © 2010 by the American Society for Enology and Viticulture
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Evaluation of Pruning Wound Susceptibility and Protection Against Fungi Associated with Grapevine Trunk Diseases
Philippe E. Rolshausen, José Ramón Úrbez-Torres, Suzanne Rooney-Latham, Akif Eskalen, Rhonda J. Smith, Walter Douglas Gubler
Am J Enol Vitic.  March 2010  61: 113-119;  published ahead of print March 01, 2010 ; DOI: 10.5344/ajev.2010.61.1.113

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Evaluation of Pruning Wound Susceptibility and Protection Against Fungi Associated with Grapevine Trunk Diseases
Philippe E. Rolshausen, José Ramón Úrbez-Torres, Suzanne Rooney-Latham, Akif Eskalen, Rhonda J. Smith, Walter Douglas Gubler
Am J Enol Vitic.  March 2010  61: 113-119;  published ahead of print March 01, 2010 ; DOI: 10.5344/ajev.2010.61.1.113
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