Kinnikinnick: Leaf gall
Photo by: R.S. Byther
Biology
Leaf gall of kinnikinnick is caused by the same fungus which causes leaf and flower gall of azalea.
Initially, infected plant parts show a thickening and then gradually become fleshy in appearance. Infected leaves and flowers thicken into greenish to pinkish galls.
As the galls mature, they become covered with a dense white coating of fungal spores. Galls finally become brown and woody.
Healthy plants can easily tolerate considerable amounts of galling without serious damage.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Pick and destroy thickened, fleshy leaves and flowers before the white fungal spores are present.
- Remove all old galls from plants prior to bloom and flushes of new growth.
- Space plants and prune to reduce humidity.
- Avoid overhead watering or limit it to times when the foliage can dry quickly.
- The variety ‘Massachusetts’ is reported to be resistant to leaf gall.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
Make two applications, the first before budbreak in spring and the second 2 to 3 weeks later.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.