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Ciencia e investigación agraria

versión On-line ISSN 0718-1620

Resumen

CAMPBELL, Paul; BENDEK, Carlos  y  LATORRE, Bernardo A. Risk of powdery mildew (Erysiphe necator) outbreaks on grapevines in relation to cluster development. Cienc. Inv. Agr. [online]. 2007, vol.34, n.1, pp.5-11. ISSN 0718-1620.  http://dx.doi.org/10.4067/S0718-16202007000100001.

Recently, severe and very destructive outbreaks of powdery mildew (Erysiphe necator) have occurred on grapevines (Vitis vinifera) in central and northern Chile. Powdery mildew epidemics may develop from inoculum surviving as mycelia on buds infected the previous season and/or as cleistothecia surviving on leaves and bark. Cluster susceptibility changes throughout the growing season, with young berries being highly susceptible and mature berries being relatively resistant. The risk of infection can be predicted based on the maximum air temperature. Aiming to improve the efficacy of powdery mildew control, this research was performed to study the risk of powdery mildew outbreaks in relation to grapevine cluster development. Our results demonstrated that fungicide spray application (kresoxim-methyl, 65-70 mg-L' or myclobutanil, 24 mg-L-1) at full flowering (stage 23) provided the best control of cluster powdery mildew on grapevine cvs. 'Criolla', 'Pedro Jimenez' and 'Semillen'. In contrast, disease incidence and severity invariably increased on clusters sprayed at other grapevine stages. This was related to the presence of highly favorable temperature conditions prevailing during flowering with moderate to high infection risk indexes. In conclusion, grapevine stages occurring between the beginning of flowering and the appearance of small berries (stages 19 through 29) were the most critical stages for powdery mildew development. Therefore, fungicide treatments applied during flowering appeared to be essential to control grapevine powdery mildew

Palabras clave : Disease forecasting; Erysiphe; fungicides; grapevine diseases; Uncinula necator.

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