After the flowers fell the green plums started growing. As soon as they were 1/4" across, They began developing these little sunken black marks. I have been consistently spraying with fruit tree spray. How can I control this? enter image description here

  • Looks like a mechanical damage to me… May 8, 2012 at 7:42
  • @JacekKonieczny There is a mark like this on every single plum on the trees.
    – J. Musser
    May 9, 2012 at 1:31

1 Answer 1


My best guess is plum curculio (see Figure 2, looks like yours).

"The Organic Gardener's Handbook of Natural Pest and Disease Control" (p170) suggests spreading a cloth on the ground and tapping the tree -- twice a day -- with a padded mallet. Gather up the bugs that fall and destroy. Or pasture your chickens in the orchard...

Or they suggest spraying "with kaolin clay beginning at petal fall and continuing for up to 8 weeks".

Or as a last resort, monitor carefully for scars and spray with pyrethrin as soon as they occur: twice, 7-10 days apart. Just be careful not to do this before pollination can occur, as pyrethrin will kill pollinators too.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.