Deciduous Tree Galls
Galls are abnormal growths on plants that can result from the feeding of living organisms such as bacteria, fungi, nematodes, insects and mites. Learn about common galls in this factsheet.
Insects
Maple Gall Mites (Eriophyidae)
Inside little green or red bumps or other weird growths on maple leaves are tiny eriophyid mites, feeding on the developing gall tissue. Learn more about these mites and what to do about them in this article on maple gall mites.
Protecting Your Tree From Emerald Ash Borer
EAB was discovered in Wisconsin in 2008 and has been slowly spreading ever since. In this video, entomologists demonstrate how homeowners can protect their trees from this insect.
Is My Ash Tree Worth Treating for Emerald Ash Borer?
When should I treat my ash tree for EAB? This factsheet addresses some of the most frequently asked questions regarding the treatment of ash trees for EAB, and the removal and disposal of infested trees.
Homeowner Guide to Emerald Ash Borer Insecticide Treatments
This factsheet describes considerations and products for treating ash trees with insecticides to control Emerald Ash Borer.
Home Landscape Insecticides
This factsheet describes active ingredients available for homeowners and the landscape insects they control.
Degree Days for Common Landscape Insect Pests
This factsheet lists degree days for emergence and hatching of a wide variety of landscape insect pests.
Calculating Degree Days
Degree Days incorporate temperature and time to quantify the rate of plant and insect development. This useful tool helps predict events such as flowering, harvest, and pest outbreaks.
Phenology
Phenology is a branch of science that studies the life cycles of plants and animals with seasonal changes and weather. Learn more in this factsheet.
Scales
There are many species of scales and they are difficult to control because of their protective covering. Learn to identify and manage scales in this factsheet.
Twospotted Spider Mite, Tetranychus urticae
The most common spider mite, the twospotted spider mite, is a general feeder that attacks a wide variety of plants. Learn about its biology and management in this article…
Scale Insects
Scale insects are often overlooked because they are immobile and look like small bumps that just might be plant parts. Learn more about this group of inconspicuous and atypical insects in this article…
