Plant Disease Management Handbook

General diagnosis = $90

The Soil Health Laboratory provides inorganic chemical analysis of soils, plants, and water. Routine procedures include standard soil testing methods, nutrient analysis of plant tissue, and inorganic water analysis.

For more information:

Oregon State University
3017 Agriculture and Life Sciences Building
Corvallis, OR 97331-3002

https://cropandsoil.oregonstate.edu/shl
Tel. 541-737-2187

Services and fees

Insect/mite and other arthropod identifications are currently provided free of charge. Fees listed below for disease diagnosis are subject to change.

Note: The OSU plant clinic accepts industrial hemp samples only if they are accompanied by the Oregon Department of Agriculture Hemp license number. The OSU Plant Clinic cannot accept marijuana samples due to university regulations.

There are several plant disease diagnostic facilities based in the Pacific Northwest that can help determine the identity of pathogens involved in plant problems. Publicly supported clinics are listed below. A listing of other plant analytical facilities, both public and private, that provide testing and/or diagnostic services can be found at https://extension.oregonstate.edu/catalog/pub/em8677 .

By C. M. Ocamb

Cause Stem decay in living trees is caused by various fungi that enter trees through wounds or small branches. Decay fungi usually do not kill trees but trees, which are affected, are structurally weakened and more likely to break during storms or harvest. Decayed trees can be a serious hazard when near roads, buildings or developed recreation areas. Decay in living trees can also provide important wildlife habitat.