Evaluation of a decision support strategy for the control of powdery mildew (Erysiphe necator [Schw.] Burr.) in grapevine in the central region of Chile
Résumé
BACKGROUND: The primary strategy to control powdery mildew in Chilean
vineyards involves periodic fungicide spraying, which may lead to many environmental
and human health risks. This study aimed to implement and evaluate the effectiveness
and economic feasibility of a novel Decision Support Strategy (DSS) to limit the
number of treatments against this pathogen. An experiment was conducted between the
2010 and 2013 seasons in two irrigated vine fields, one containing a cultivar of
Cabernet Sauvignon (CS) and another of Chardonnay (CH).
RESULTS: The results showed that the DSS effectively controlled powdery mildew in
CS and CH vine fields as evidenced by a disease severity lower than 3%, which was
lower than that observed in untreated vines (approximately 10% and 40 % for CS and
CH, respectively). The DS strategy required the application of only 2-3 fungicide
treatments per season in key vine phenological stages, and the cost fluctuated between
US $ 322 and 415 per hectare, which was 40 to 60 % cheaper than the traditional
strategy employed by vine growers.
CONCLUSION: The Decision Support Strategy evaluated in this trial allows a good
control of powdery mildew for various types of epidemics with an early and late
initiation.
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