In a market as eager for quality fruit as cherry. It primarily occurs on tart cherry crops. Cherry leaf spot starts out as purple spots on the upper surface of older leaves in early summer. Fungicides are also available for controlling this disease. Infected leaves have round, purple, red, or brown spots which later turn black in color. Sign up for our newsletter. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Cherry leaves with spots are the first symptoms, especially on new leaves. Take care to wait the complete 'post harvest interval' (PHI) listed on the label. Hopefully, it’ll help make your holiday season as special as possible. Applications should be repeated throughout the growing season at the interval listed on the fungicide label, including one application after harvest. If a fungicide is in order, begin applying two weeks after blossoming when the leaves are completely open. By the end of July, most cherry trees stop forming new leaves and by late summer, all the leaves are mature. Some products are registered for use on ornamental Prunus species but are not safe to use on stone fruit that will be eaten. Sanitation is a critical component of cherry leaf spot control. In Minnesota, leaf spot can be found in plums and tart cherries. Leaf spot can be severe in one area and absent a few miles away. Also, remove and destroy fallen leaves to eradicate as much of the inconspicuous spore bearing structures as possible. The centers of the lesions may fall out and give the leaf the characteristic “shot hole” appearance. Cherry leaf spot is most common on Morello cherry varieties, which are a type of sour cherry. European plum is less likely to be affected. However, this pathogen also attacks sweet cherry and plum trees. 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. Regents of the University of Minnesota. The name of the plant being treated MUST BE LISTED on the fungicide label or the product cannot be used! Leaves with many leaf spots turn yellow and fall off the tree. Repeat according to the manufacturer’s instructions throughout the growing season including one application post-harvest. Manage this disease by keeping your orchard clean. Early leaf drop interferes with fruit ripening and color development, resulting in poor tasting, small, off color fruit. Leaf spots are first purple but eventually turn brown. Although the leaves are dead, the fungi inside the leaves survive until the following growing season. All varieties of tart cherry are likely to be affected by cherry leaf spot. Management is done through the application of fungicides from petal fall through to the middle of the summer. Proper care of cherry trees, from planting onward, also helps prevent this disease from taking hold. Fruit tends to be dwarfed in size and ripen unevenly. Always completely read and follow all instructions on the fungicide label. Individual spots sometimes grow together, forming irregular patches of discoloration on the leaf surface. Some copper fungicides are acceptable for organic production. Look for fungicides with the active ingredient of myclobutanil or captan. The optimal temperatures for ascospore raindrops to the green, healthy leaves and serve as primary inoculum for di… Glen R. Stanosz, Wisconsin-Madison; Mary L. Torsello, USDA Forest Service, Cherry ‘Morello’ Variety: What Are English Morello Cherries, Cherry Brown Rot Symptoms – How To Control Brown Rot On A Cherry Tree, Diseases Of Pumpkins: Learn About Pumpkin Diseases And Treatments, Mibuna Mustard Greens: How To Grow Mibuna Greens, Grateful Gardening: How To Show Garden Gratitude, Indoor Winter Savory Care: How To Care For Winter Savory Inside, Alternaria Leaf Spot Of Turnip – Treating Turnips With Alternaria Leaf Spot, Phytophthora Root Rot: Treating Avocados With Root Rot, Can You Prune An Overgrown Juniper – Tips For Overgrown Juniper Pruning, Onions With Powdery Mildew – Tips On Treating Onion Powdery Mildew, The Bountiful Garden: Bringing The Garden To Thanksgiving, Overwintering Containers And End Of Season Cleanup, Must Have Winter Shrubs – Top 7 Shrubs For Winter Interest, Enclosed Porch Garden – Indoor Gardening On The Porch.