How to spot it
Bright yellow-orange spots on apple leaves in late spring. On nearby junipers and red cedars, brown galls grow orange jelly-like horns after spring rain.
What it does
Leaves drop early and the tree weakens; fruit can be spotted.
What to do now
- Cut the galls off nearby junipers in winter.
- Spray sulfur on apples from pink bud until a few weeks after bloom.
Keep it away next time
- Plant resistant apples (such as Liberty, Freedom, or Redfree).
- If you can, remove red cedars growing close to your apple trees.
Plants it affects
See also
Not sure? Your county extension office can identify it from a photo or sample, often for free.