Mountain Ash: Leaf blister mite
categories: Mountain Ash Mountain Ash Insects Ornamental trees Ornamentals
revision date: 2022-11-25 11:37
Biology
The leaf blister mite is a very tiny white, sausage-shaped eriophyid mite. They are seldom visible to the unaided eye. Eriophyid mite feeding on the underside of mountain ash leaves causes development of blister-like spots on the upper leaf surface. These raised spots are generally light green, round and somewhat wrinkled in appearance. Older leaf blisters may turn brown. Severe infestations may result in premature leaf drop.
Management Options
Use Integrated Pest Management (IPM) for successful plant problem management.
Non-chemical Management
Select non-chemical management options as your first choice!
- Avoid use of broad-spectrum insecticides which kill natural predators, especially predaceous mites.
- A strong, direct spray of water may help wash mites from trees. It also reduces dust, which seems to favor eriophyid mite infestations.
- Hand-pick and destroy damaged leaves to improve appearance of small trees.
Chemical Management
IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.
- None recommended