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Rain Triggers Walnut Diseases

June 14, 2017

Western Farm Press has reported Walnut Botryosphaeria (Bot) near Arbuckle, Calif. The disease causes blighted shoots, twigs and fruit. The fungi enter through scars and grow in temperatures over 50°F. Infections spreads through rain, irrigation and pruning.

Growers should avoid irrigation that wets the canopy and can spread the disease as well as disinfect pruning equipment. Preventing scarring and opening on the nut from insects can also deter the disease.

Quadris Top® fungicide can be applied for Bot panicle and shoot blight control and provides preventative, systemic, and reachback control of Walnut Bot.

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