Pest Alert header image   United States
Department of
Agriculture
Forest Service

Butternut Decline

A decline of butternut has been noted in Wisconsin, Minnesota, Iowa, and Illinois for the past several years. The causes are being investigated and we need additional information on the occurrence of the problem. We also need to know if the problem is found on walnut.

Symptoms of decline include trunk and branch cankers with subsequent dieback of the crown. Decline affected trees do not recover, but will eventually die after several years of progressive crown deterioration.

We would appreciate receiving reports on the occurrence of the decline.
Mortality Crown Dieback
Mortality Dieback
Stem Cankers Branch Cankers
Stem Cankers Branch Cankers


For additional information, contact:
USDA Forest Service
Forest Health Protection
180 Canfield Street
Morgantown, WV 26505
(304) 285-1541

USDA Forest Service
Forest Health Protection
271 Mast Road |
Durham, NH 03824-0640
(603) 868-7704

USDA Forest Service
Forest Health Protection
1992 Folwell Avenue
St. Paul, MN 55108-1099
(612) 649-5261