North Central Research Station

Butternut trees killed by butternut canker caused by an exotic invasive fungus. Photo by M. Ostry

Invasive species - Exotic pathogens, plants, and insects are non-native or alien species that have been introduced into new ecosystems outside of their native range. They are invasive if they become established and spread. Native species can also be invasive. The diseases caused by both exotic and native invasives can seriously damage our urban and rural forests, reducing their ecological and economical value.

Expanding pocket of oak wilt caused by a native invasive fungus.  Photo by J. Juzwik

Oak health in the Midwest - Oak trees provide wildlife habitat and wood products, and they are important in landscapes. Oaks occur on over 5 million hectares of land in this region. The quantity and quality of this resource are threatened by oak wilt, oak decline, and urbanization.  We are working to reduce the impacts of these factors on the oak resource in the region.

Plantation of red pine with shoot blights, caused by native invasive fungi.  Photo by M. Ostry

Diseases and changing forest management in the Midwest - Just as forest ecosystems constantly change over time, so too are the goods and services we desire from the forests. In response, forest managers are beginning to manage forests differently than in the past to achieve these new goals. New management includes growing trees to older ages, creating stands of mixed ages and mixed species, and growing trees in intensively managed plantations, similar to agricultural row crops, for producing energy and fiber. Some of these practices can inadvertently create conditions conducive to the development of damaging diseases.