Managing Biotic Tree Problems

including Insects, Mites and Diseases

A number of common diseases and insects affect the health of Wisconsin trees. Some probelms are more severe than others, and some may warrant treatment.

More severe insect and disease issues may result in premature leaf drop, dieback, overall decline in tree health, or tree mortality. Some of these biotic (i.e. living) tree health threats may become chronic if left untreated. Less severe insect or disease issues may only cause trees cosmetic issues, or minor foliar symptoms later in the season.

 

Common Wisconsin Insects & Mites

  • Tent caterpillars and fall webworms

  • Scale insects (e.g. Magnolia Scale)

  • Spruce spider mite & Two-spotted spider mite

Tent Caterpiller

Aphid Damage

Damage from Emerald Ash Borer

Damage from Emerald Ash Borer

 

Common Wisconsin Tree Diseases

  • Needlecasts (Rhizosphaera, Stigmina, Swiss)

  • Cedar-Apple and related rusts (Gymnosporangium spp.)

  • Canker diseases (Cytospora, etc.)

  • Anthracnose (Sycamore, Maple, Ash, etc.)

Apple Scab

Red Oak Chlorosis

If you notice a change in your tree’s health, please give us a call for further assessment. Our arborist will help diagnose your problem and prescribe a treatment regiment if appropriate.