Diagnosing Plant Problems

Bring your plant sample or plant insect pest to the Extension La Crosse County office during regular business hours of 8 AM – 4:30 PM. This service is available to the general public.

There is a $3 mailing charge for this service. Diagnostics may take up to 1-2 weeks to get results, and the Diagnostics Lab will contact you directly with service fees.

For a brochure of all of our diagnostic services and fees, open the Horticulture Diagnostic Services Flyer.

For instructions on collecting a “good sample,” please call the Extension La Crosse County at (608)785-9593 or email them at uwexmail@lacrossecounty.org

General Links

• UW – Plant Disease and Diagnostic Clinic
• Oak Wilt 
• Foliose Lichens
• Winter Salt Injury and Salt-tolerant Landscape Plants (.pdf, 12 pages)
• Damping Off  (.pdf, 1 page)
• Rhizosphaera Needle Cast
• Wood Mulch and Tree Health
• Apple, Crabapple, hawthorn, and juniper disorder: Cedar Rust Complex (.pdf, 4 pages)
• Tubakia Leaf Spot
• Fir Broom Rust (.pdf, 1 page)
• Downy Mildew
• Diplodia Shoot Blight and Canker
• Conifers Disorder: Sphaeropsis Shoot Blight and Canker (.pdf, 2 pages)
• Armillaria Root Disease
• Rose Disorder: Rust
• Powdery Mildew in Ornamentals (.pdf, 4 pages)
• Vine Crops Disorder: Powdery Mildew (.pdf, 2 pages)