These very common foliar diseases are collectively called “shot hole diseases” because of the “holes” left behind after the infected leaf tissue falls out. The spots begin to brown and fall, leaving a hole in the foliage. Lesions may emerge to produce large, irregular spots. However, this pathogen also attacks sweet cherry and plum trees. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. The disease causes the part of the leaf that is affected to turn brown and die. Once fungal infection occurs in the tree, the fungus will produce tremendous spore numbers from lesions established on the leaves, and in most cases, there are usually more spores developing from lesions than ascospores that are coming up from leaves overwintering on the ground. The spoors of the fungus overwinter in leaves on the ground and are then released by rains when blossoms are falling in the spring. Plant cherry trees in locations with good soil drainage, lots of sunshine, good air circulation, and then prune trees properly each year to prevent cherry leaf spot fungus infections. There are three currently-registered fungicides that effectively control both cherry leaf spot and powdery mildew. Thus, the purpose of early season sprays is to prevent or significantly delay initial infection events. This situation was somewhat surprising because environmental conditions were not exceptionally conducive for leaf spot infection. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Cherry leaf spot starts as purplish spots on leaves at the top of the tree. Proper care of cherry trees, from planting onward, also helps prevent this disease from taking hold. As with all other diseases, cherry leaf spot infection will rise to epidemic proportions under conducive weather conditions, and with less infection early, there will be less inoculum in the tree that growers will have to control during times with more optimal conditions for cherry leaf spot development. Prior to shuck split, the recommended fungicide for cherry leaf spot management is chlorothalonil (Bravo and generics). Spores from lesions on the leaves are much more likely to find new leaf targets within the tree than spores coming up from the ground. Early season control will help with disease control prior to harvest (severe, early season infection can affect fruit ripening) and help trees hold leaves into September. Fruit tends to be dwarfed in size and ripen unevenly. Kirschblätter mit Flecken sind die ersten Symptome von Kirschblattflecken. If you are growing cherry trees, you should know about cherry leaf spot, one of several fungal diseases that attack both cherry and plum trees. Infected leaves have round, purple, red, or brown spots which later turn black in color. It impacts many trees, but doesn’t usually present any critical danger to them.. Black spot disease is a fungus that mostly attacks fruit trees like the cherry tree, walnut, grapevine, raspberry, blackcurrant, oak or red currant, certain shrubs like hydrangea and also vegetables such as cucumber, bean, pea, or tomato. If cherry leaf spot is allowed to go unchecked, it will result in several negative effects. A fungus, Blumeriella jaapii, is responsible for cherry leaf spot disease. The symptoms differ slightly but the treatment remains the same. Cherry leaf spot is a fungal disease that causes small, purplish spots on the upper surface of leaves.