Ask Your PCA: How do you manage alternaria leaf spot in almonds?


Issue Date: May 14, 2014
Tom Parreira, PCA, North Valley Ag Services, Chico

Alternaria leaf spot is a wet-weather disease. Similar to shot hole disease, alternaria creates lesions on the leaf, and if allowed to go unchecked, it will eventually cause defoliation in midsummer and yield loss. We see alternaria leaf spot as fairly large, brown spots on the almond leaves. Leaf spot will develop quicker in June and July, and trees can be almost completely defoliated by early summer when the disease is severe.

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