Coryneum blight also called Shot hole diease affects peaches, apricots and sweet cherries and other fruit trees. Some flowering ornamental trees can be affected as well. Since little can be done to control shot hole fungus once the trees have been infected, prevention is essential in treating shot hole disease Disease takes place in spring and early summer and in cool, wet periods prior to harvest.
Blight is difficult to eradicate because the fungus in infected buds and twigs may produce spores for two to three years. Control requires chemical sprays and removal of dead wood over a three-year period. Disease thrives in wet conditions, commonly overwinters. It is important to thoroughly inspect trees after leaf fall for any symptoms, signs will show most then.
Apply All Season Oil Spray – Bonide Copper Fungicide – in late fall and early spring for control.