Evaluation of a Trunk Injection Technique to Control Grapevine Wood Diseases

G. Darrieutort, P. Lecomte


Vineyard experiments were conducted over five years in the Bordeaux area to evaluate the effectiveness
of trunk injections in controlling Eutypa dieback (4 trials) and esca (1 trial). Single treatments were applied in winter
2001 or 2002 using the tree injector StemJect®. Three compounds were tested: two triazole-derived fungicides,
propiconazole and difenoconazole, and one elicitor, 2-hydroxybenzoïc acid. Symptomatic vines of two susceptible
cultivars, Cabernet Sauvignon and Cabernet Franc, had first been identified in summer in the year before the treatments
were started. A disease scale was used to rate the severity of the foliar symptoms. After treatment, disease
development was recorded on the same vines in the following years, from 2002 to 2005. Analyses were based on the
evolution of foliar symptoms and on the development of wood symptoms (% area of dead wood). This novel procedure
made it possible to determine the sanitary status of each vine in terms of three classes of disease severity: remission
of symptoms, stability or worsening. No treatment had a significantly durable effect on disease expression irrespective
of the site, the compound or the disease studied. Some phytotoxic effects with the triazole fungicides were noticed.
Prospects for trunk injections as a means to solve these insidious problems in viticulture are discussed.

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DOI: http://dx.doi.org/10.14601/Phytopathol_Mediterr-1853

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