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Evaluation of chemicals against esca-related pathogens, in vitro and as pruning wound protectants
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Resumo(s)
During the past decades, Grapevine (Vitis vinifera) Trunk Diseases (GTDs) have been under study due to their increase in incidence through all winegrowing regions worldwide. Among the most common GTDs, the esca disease complex is one of the most concerning, leading to important losses in longevity and yield. Pruning wounds are considered the main entry port for fungal spores which, if not protected, may allow the penetration of several wood pathogens, such as Phaeomoniella chlamydospora (Pch) and Phaeoacremonium minimum. In the present study, the first goal was to evaluate nine chemicals – cyprodinil + fludioxonil, copper oxychloride, copper oxychloride + summer oil, blad, fosetyl-Al, elemental silver, hydrogen peroxide, glutaraldehyde and a bituminous coating - in vitro against the growth of these fungi. The second goal was to evaluate four selected chemicals - cyprodinil + fludioxonil, copper oxychloride + summer oil, blad and a bituminous coating - as pruning wound protectants under field conditions against Pch in cv Cabernet Sauvignon. The pruning wounds were inoculated with Pch 1, 31 and 90 days after pruning. Three months after each inoculation the canes were collected and reisolations of the isolate were made. Our study found that most chemicals tested were effective in vitro, in reducing mycelial growth of both fungi. However, the results obtained under field conditions showed that one of the treatments significantly reduced the presence of Pch on the first inoculation, providing a partial protection to fresh wound. The remaining treatments were not effective as wound protectants. In summary, novel chemicals were tested that were capable to greatly inhibit in vitro the growth of esca-related pathogens and a chemical treatment was identified which was capable of reducing the incidence of Pch as wound protectant. This study improved the current knowledge in chemicals used against some esca-related fungi and in pruning wound protection
Descrição
Mestrado em Viticultura e Enologia - Instituto Superior de Agronomia - UL / Faculdade de Ciências - Universidade do Porto
Palavras-chave
Esca disease complex blad pruning wound protection fungicide tracheomycosis
Contexto Educativo
Citação
Costa, J.N.G. - Evaluation of chemicals against esca-related pathogens, in vitro and as pruning wound protectants. Lisboa: ISA, 2018, 84 p.