North Central Research Station

Oak Health in the Midwest - Oak Decline Armillaria Root Disease Urbanization Impacts Oak Wilt Oak Decline Regional Assessment In the Missouri Ozarks Armillaria Root Disease

The issue

Root disease caused by Armillaria species can damage conifers and hardwoods. These fungi are also important in wood decay and nutrient recycling, and they can survive on a site for many years. Because most of their life cycle is below the surface of the soil, these fungi are difficult to study, and there is much yet to be learned about their roles in the health of our trees and forests. We do know that Armillaria root disease is contributing to the oak decline occurring across upland forests of the Missouri Ozarks and may be contributing to oak mortality in northern Minnesota and spruce decline in northern Wisconsin.

What are we doing about it?

We are identifying and monitoring Armillaria species associated with decline and mortality in various areas of the region and are using new technologies to identify the species.

We are studying the impact of Armillaria species on oak regeneration in areas of oak decline in the Missouri Ozarks. 

Research products

Kromroy, K.W. 2004. Identification of Armillaria species in the Chequamegon-Nicolet National Forest

For additional information on this topic, refer to:

Williams, R.E.; Shaw, C.G. III; Wargo, P.M.; Sites, W.H. 1986. Armillaria root disease.

Shaw C.G., III; Kile, G.A. 1991. Armillaria root disease. Agric. Handb. 691. U.S.Department of Agriculture, Forest Service. 233 p.

Our Publications

Treesearch

USDA Forest Service - North Central Research Station
Last Modified: January 03, 2005