Shothole blight

Shot hole disease thrives in wet conditions, especially during extended wet periods. The disease is most noticeable in spring, as new growth is most susceptible. Shot hole fungus commonly overwinters inside the infected buds, as well as twig lesions, where the spores may thrive for several months. Therefore, it is important to thoroughly inspect trees after leaf fall for any symptoms. Most signs of shot hole disease occur in spring, causing spots (or lesions) on new buds and young leaves and shoots. Buds will have a varnished appearance and spots will first look reddish or purplish-brown in color and about ¼ inch in diameter. Eventually, these spots become larger, turning brown and falling out—giving the appearance of gunshot holes in the foliage. As it progresses, the leaves will drop. The stress also affects the tree’s ability to produce, and any fruit that may develop will usually be affected as well with spotting on the upper surface that may even become rough.