Angular leaf scorch

Angular leaf scorch - Pseudopezicula tetraspora
Annemiek Schilder, MSU Plant Pathology

This disease occurs in New York and is very similar to the European “Rotbrenner” disease. 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.


Leaf lesions. Photo: http://www.APSnet.org	Necrotic berry stems.	Photo: David Gadoury, Cornell

Addition information

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Special grape disease problems and controls (from Michigan Fruit Management Guide) (Download Adobe Acrobat Reader to view PDF files)

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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program
in collaboration with MSU Extension and the Michigan Agricultural Experiment Station.
Updated10/24/07 Contact: J.N. Landis.