Mínimo uso de fungicida para el control de Botrytis cinerea en uva de mesa cv. Thompson Seedless
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Date
2022
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Abstract
Gray mold, caused by Botrytis cinerea, is the main disease in table grape during postharvest. The cultivar Thompson Seedless is especially susceptible and it is exposed to multiple pre-harvest fungicide applications to prevent the infections that occur in flowering and during the berry ripening. Frequently the infection occurs at the flowering phase and remains quiescent until the berries start ripening or even showing an asymptomatic infection until it is expressed during post-harvest. The objectives of the study were to evaluate the effect of reduced application of fungicide, assessed through an infecting predictive model of B. cinerea and two shading conditions on decay and harvest and post-harvest quality of table grapes cv. Thompson Seedless. The fungicide treatment effect was evaluated (reduction of 2 fungicidal applications according to the infection model based in hours of wet foliage and temperature) and the shading effect (shading of 65% and 85%) in a factorial design. The fruit was harvested at two harvest times, and it was evaluated after 60 days in 0° plus 3 days in 20° C. A low gray mold incidence was found, the treatments did not affect the disease development, the model corroborated that the micro-environmental conditions for B. cinerea infection did not achieve a critical value. The use of shadow nets affects the berries quality, the shadowing treatments delay in 7 days the ripening of the berries and increase the incidence of berry splitting during postharvest. The effect of hairline cracks, shatter and bleaching was variable.
Description
Tesis (Magíster en Fisiología y Producción Vegetal)--Pontificia Universidad Católica de Chile, 2022
Keywords
Botrytis cinerea, Gray mold, Shading, Vitis vinifera, Thompson seedless