Forest Health Annual Reports

The DNR forest health team works to prevent, detect and control Wisconsin's forest pests, particularly invasive plants, insects and diseases that jeopardize trees and ecosystems. Through research, forest management guidance and education and outreach efforts, forest stability and sustainability is established and enriched.

Each year, staff create an annual report to give updates on the program and forest health threats in Wisconsin. Browse the newest reports below.

2023 Annual Report

Read about all of the latest forest health issues in Wisconsin, including:

spongy moth’s rising numbers and evaluation of control techniques;
emerald ash borer continuing to spread and kill ash trees;
an update on the slow spread of oak wilt; and
the effects of storm damage, particularly the "Blue Blizzard" of December 2022.

Read the Report

Annual report cover

Past annual reports

To access archived regional and annual reports dating back to 1951, contact your regional forest health specialist.