Lesions may emerge to produce large, irregular spots. Once lesions have developed, masses of secondary or summer spores (conidia) are formed from the slightly concave eruptions (acervuli) on the underside of the leaf. Any practice that promotes faster drying of leaves will reduce the risk of infection. Spots usually do not form on fruit. This fact sheet was originally published in 2008. Cherry leaf spot symptoms on upper surface of cherry leaf. Diseased leaves drop prematurely, and severely affected trees may be defoliated by mid-summer. The small purple spots soon appear on the upper surface. Although this symptom does not occur every season, the spotting of infected leaves is always visible. Especially in commercial plantings, the disease is controlled primarily with fungicide sprays. Cherry leaf spot is caused by the fungus, Blumeriella jaapii (previously called Coccomyces hiemalis). Copyright © 2016, The Ohio State University, Michael A. Ellis, Department of Plant Pathology, ©  2020 The Ohio State University, College of Food, Agricultural, and Environmental Sciences, College of Food, Agricultural, and Environmental Sciences, Ohio Agricultural Research and Development Center, 2120 Fyffe Road | Room 3 Ag Admin Bldg. College of Food, Agricultural, and Environmental Sciences We work with families and children, farmers and businessowners, community leaders and elected officials to build better lives, better businesses and better communities to make Ohio great. When rain and dews are absent and at lower temperatures, as long as 15 days may be required before symptoms appear. Spots gradually enlarge to about ¼ inch in diameter and turn reddish-brown. Whitish-pink masses of sticky spores (conidia) form within the spots on the undersides of infected leaves during periods of damp weather (Figure 2). Columbus, Ohio 43210 Leaf spots on cherries are caused by the fungus Blumeriella jaapi. 2120 Fyffe Road | Room 3 Ag Admin Bldg. This site designed and maintained by CFAES Marketing and Communications. Conidia are spread to other leaves by splashing raindrops and are capable of causing new infections (each producing thousands of additional conidia) under the temperature and wetness conditions listed in Table 1. | Columbus, Ohio 43210. The disease is also known as “yellow leaf” or “shot hole” disease and also affects plums. The fungus overwinters in these leaves. During the latter part of May and the first half of June, small circular purple spots appear on the upper surface of the leaf (Figure 1). English Morello cherry trees are most commonly afflicted with leaf spot, and the disease is considered to be serious in the Midwest, New England states, and Canada. Cherry leaf spot is caused by the fungus, Blumeriella jaapii (previously called Coccomyces hiemalis). Accessibility Accommodation. Infected leaves usually turn yellow or gold before they drop prematurely. CFAES provides research and related educational programs to clientele on a nondiscriminatory basis. How does cherry leaf spot survive and spread? Cherry leaves with spots are the first symptoms, especially on new leaves. | Columbus, Ohio 43210 | 614-292-6181 Proper pruning to open the canopy will increase sunlight penetration and air circulation. For the most recent fungicide recommendations, commercial growers are referred to Bulletin 506. The disease mainly affects the leaves, but lesions may also appear on fruit, petioles and fruit stems (pedicels). Taken from Tree Fruit Crops IPM Disease Identification Sheet No. For more information, visit cfaesdiversity.osu.edu. CFAES Diversity  |  Nondiscrimination notice  |  Site Map. This mass of conidia provides the white appearance to the underleaf lesions. The fungus overwinters in dead leaves on the ground. We connect with people in all stages of life, from young children to older adults. Spores (ascospores) are produced in the apothecia and are forcibly discharged during rainy periods for about six to eight weeks, starting at petal fall. If you have a disability and experience difficulty accessing this content request accommodation here. Cherry leaf spot is usually considered a disease of low concern; however, in severe cases it can cause defoliation and failure of fruit to develop. Figure 3. 8. The fungus overwinters in dead leaves on the ground. The most conspicuous symptom, especially on sour cherries, is the golden yellowing of older infected leaves before they drop off (Figure 3). After six to eight weeks, the centers of the spots may dry up and drop out, giving a “shot-hole” appearance. In early spring (about petal fall), fungal fruiting bodies called apothecia develop in these leaves. Cherry leaf spot disease cycle. Early and repeated defoliation can result in: (1) dwarfed and unevenly ripened fruit with poor taste; (2) devitalized trees that are more susceptible to winter injury; (3) death of fruit spurs; (4) a reduction of fruit set and size; (5) small and weak fruit buds; (6) reduced fruit growth; and (7) eventual death of the tree. The “shot-hole” effect is more common on sour than on sweet cherries.

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