MSU Extension Integrated Pest Management

Angular leaf scorch

Disease

Angular leaf scorch

Pseudopezicula tetraspora

Distribution: Angular leaf scorch occurs in New York.

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Lesions are initially yellow or reddish and confined by major veins. They later become necrotic and surrounded by yellow or red margins. Late-season infections may look like freckled spots and can cause premature defoliation. Infected flower clusters dry up. Unlike Botrytis blight, this disease infects only the berry stems, not the rachis. The pathogen overwinters in fallen infected leaves. The disease may seem absent in most years but can be severe in years with prolonged rainy weather.

• Crops Affected: grapes

  Similar Species

  Angular leaf scorch is very similar to the European Rotbrenner, a disease.