|Blight||Slightly sunken or slightly swollen cankers on branches or the trunk are yellow-brown and oval or irregular in shape. As the stems are girdled, the leaves yellow and brown but remain attached to the branch. Water sprouts may develop below the canker. During wet weather, yellowish masses of spores ooze from orange pimple-like fruiting structures that pepper the surface of the canker.||Cryphonectria parasitica (formerly Endothia parasitica)||American and European chestnuts are susceptible. Chinese and Japanese chestnuts are not immune but have some resistance. Remove infected trees.|
|Leaf spot||Small, circular, yellow to brown spots have concentric rings within them. Spots may drop out and leave a shot hole, or leaves may fall prematurely.||Marssonina ochroleuca||No control is recommended.|
|Twig canker (Chinese and Japanese chestnuts)||Cankers on any part of the tree girdle and kill the tissue.||Cryptodiaporthe castanea||Prune infected wood.|
Chestnut blight cankers
Prepared by Gary W. Moorman, Professor of Plant Pathology
Notice: The user of this information assumes all risks for personal injury or property damage.
Warning! Pesticides are poisonous. Read and follow all directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams or ponds.
Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
Visit Penn State Extension on the web at extension.psu.edu.
Where trade names appear, no discrimination is intended, and no endorsement by Penn State Cooperative Extension is implied.
This publication is available in alternative media on request.
The Pennsylvania State University is committed to the policy that all persons shall have equal access to programs, facilities, admission, and employment without regard to personal characteristics not related to ability, performance, or qualifications as determined by University policy or by state or federal authorities. It is the policy of the University to maintain an academic and work environment free of discrimination, including harassment. The Pennsylvania State University prohibits discrimination and harassment against any person because of age, ancestry, color, disability or handicap, national origin, race, religious creed, sex, sexual orientation, gender identity, or veteran status. Discrimination or harassment against faculty, staff, or students will not be tolerated at The Pennsylvania State University. Direct all inquiries regarding the nondiscrimination policy to the Affirmative Action Director, The Pennsylvania State University, 328 Boucke Building, University Park, PA 16802-5901; Tel 814-865-4700/V, 814-863-1150/TTY.