Most “sick tree” problems can be traced back to underlying stresses that have reduced the tree's vigor, making it more vulnerable to diseases or insect pests.
Browning or dieback is usually caused by weather-related stress, sometimes in combination with pests and diseases.
A guide for how to collect and where to get a sample analyzed for plant diseases.
Black leg is a serious disease of Brassica crops that has recently appeared in outbreaks in western Oregon. It threatens Brassica production in the Pacific Northwest. In an effort to manage the disease and get it back to ...