Really?? We've followed the instructions and only sprayed it once a week.

First, you don't want to spray ANY desirable tree with a herbicide!! Herbicides are intended to kill plants - as in trees - and so are typically restricted to weed control.

Perhaps you meant insecticide, which makes much more sense :-) However, you should refrain from spraying anything until you have identified properly/correctly what is causing the problem!! This is the basis for Ken's comment about chemical shock - spraying willy-nilly with some sort of generic, mixed-use product can create far more problems than it solves.

What kind of a cherry - fruiting or ornamental? Cherries are quite prone to a host of fungal problems and excessively wet and warm weather can exacerbate them. But most fungal controls are only preventative, not curative, and so must be applied at an appropriate time. Damaged leaves will not recover a pristine appearance - they will remain damaged until they drop.

Take clear photos of the problem and a sample branch into your county extension office for an accurate diagnosis of the problem and recommended treatment. Be prepared to answer questions about planting, soil and care conditions as well.

Overall, the tree does not look all that bad.......although in need of some judicious pruning :-)

What exact product did you use? I'm asking because I have seen 3-in-1 sprays in stores and when looking at the ingredients the only thing in it is neem oil, but there are also others that have different chemicals.

Rodney

Yes, I meant insecticide, not herbicide! Thank you.

Rodney - the product we used is: "Garden Safe, Fungicide 3, Fungicide/Insecticide/Miticide, for Organic Gardening, for use on roses, flowers, houseplants, ornamental trees and shrubs, fruits and vegetables in and around the home and home garden." Under "Active Ingredients" it says "Clarified Hydrophobic Extract of Neem Oil 0.9%, Other Ingredients 99.1%".