UTAH CORYNEUM BLIGHT CONTROL

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What Is The Cause Of My Tree's Illness?

Coryneum blight, also known as shothole blight, is a fungal disease that can cause damage on peach, nectarine, apricot, almonds (ornamental as well as nut bearing) and, to a lesser degree, cherries (tart and sweet). Coryneus blight is caused by the fungal pathogen Wilsonomyces carpophilus.

Damage Done By Coryneum Blight

Almond, apricot, nectarine, peach, prune and cherry trees can be affected by coryneum blight. Both edible and ornamental varieties are vulnerable to infection. Almost all over-ground parts of the plants are affected including the fruits, buds and the stems, but the damage is most noticeable on the leaves. The symptoms begin with small (1/10-1/4”) reddish or purplish-brown spots with light green or yellow ring around them. As the disease progresses the damaged areas become slightly larger and then dry up and fall away, leaving BB-sized holes behind. As the fungus spreads, more leaf tissue is damaged until the leaf falls. Significant infections can reduce the amount of photosynthesis that can occur, weakening the plant, and decreasing fruit production.

How A Basic Diagnoses Is Made

Spotted spores primarily on leaves and fruit and holes in the tree leaves.

What Are the Options for Treating My Ash Trees?

Emerald ash borers are not native to North America, so ash trees have little natural resistance to this pest. Fortunately, there are a variety of insecticide treatment options available and research has shown that treatments can be effective.

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