- fungus Wilsonomyces carpophilus
- aka Coryneum blight
- other bacteria and fungi cause similar symptoms, collectively known as "shot hole diseases"
COMMONLY AFFECTED TREE SPECIES
- Ornamental cherries
- Stone fruits
- English laurel
- Purple-brown spots on young leaves
- The infected spots eventually drop out of the leaf, creating the "shot holes"
- Stem cankers provide overwintering site
- Spotted, deformed fruit
- Copper fungicide or chlorothalonil, available at A Plus by request
- Apply in winter after leaf drop and before bloom
- If severe, apply a second time during full bloom before petal drop
- Remove old fruit and all infected wood
- Prevent sprinklers from wetting foliage
"Look closely at those little purple-brown spots,
soon they'll fall out as though the leaf were shot."