Black leaves on trees
My redspire pear trees are showing a clump of black leaves every so often. No other trees or shrubs have this problem. I live in Nampa, Idaho 83687, usda 6, very alkaline soil. Two of the trees are about 10 years old and one is 2 years. I don't know how to treat these trees. It has been a very wet spring and the summer heat has not yet turned on this year. Each of these trees are planted in separate beds in full sun conditions.
Submitted by BHGPhotoContest

The clumps of black leaves on your pear tree are likely symptoms of fireblight infection. This bacterial disease attacks pears, apples, and closely related species. The disease is most likely to spread during wet conditions. Since the infections in your trees are minor, you can probably control it by pruning out the affected shoots. Prune several inches back into healthy wood, and dip the pruning shears in rubbing alcohol or a 10% bleach solution between each cut.

Answered by BHGgardenEditors