Without knowing whether it is a pest or a disease (shot hole), it's difficult to make a recommendation. See if you can find the pests. If not, it may be a disease and spraying an insecticide won't help matters. If you can't determine whether it's from insects or from a disease, take a sample into your cooperative extension office for a positive diagnosis. Helpful staff will make control recommendations. Good luck with your plum tree.
You must be signed in before you can post questions or answers. Click here to join!
