Fungal Leaf Spot Diseases - Integrated Pest Management at the ...

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- 4 -Table 1. Common Fungi Responsible for Leaf Spot Diseases in Midwestern Shade and Ornamental TreesFungal Trees General SymptomsAlternariaAsh, boxelder, catalpa, cherry, elm,holly, locust, magnolia, maple,mountain ash, pear, plum, poplarSmall, circular to angular, often zoned brown spots that may dropout, leaving shot-holes.AscochytaCercosporaCiboriniaCoccomycesAsh, boxelder, butternut, catalpa,dogwood, golden-chain, pea tree,walnut, willowAlder, almond, apple, apricot, ash,aspen, beech, boxelder, buckeye,butternut, catalpa, cherry,cottonwood, dogwood, elm,golden-chain, hawthorn, hazelnut,hickory, holly, honey locust, hoptree, horse chestnut, Kentuckycoffee tree, linden, magnolia,maple, mulberry, oak, osageorange,pawpaw, peach, pear,pecan, persimmon, London planetree, plum, poplar, prickly ash,redbud, Russian olive, smoke tree,sourwood, sweet gum, sycamore,tree of heaven, tupelo, walnut,willowAspen, chestnut, cottonwood, oak,poplar, willowAlmond, amelanchier, apricot,beech, cherry, oak, plumSmall, circular to irregular spots with gray to tan centers and adark border. May appear targetlike.Circular to angular, small to large, gray or brown spots with darkmargins. Some spots may drop out, leaving ragged shot-holes.The spots may be numerous and cause the leaf to turn brown andfall prematurely. Spray applications to control diseases caused byspecies of Cercospora are rarely, if ever, needed.Round to oval, brown then inky black spots. Thin, saucerlikenearly black sclerotia form in dead tissue and later drop out.Circular, dark purplish to reddish brown spots that turn brown anddrop out, leaving ragged shot-holes; or leaves turn yellow and fallearly.
Table 1. Continued- 5 -Fungal Trees infected General symptomsConiothyriumCoryneumCristulariellaCylindrosporiumElsinoe, anamorph:SphacelomaEntomosporium,telemorph:DiplocarponApple beech, crabapple, elder, elm,hawthorn, hickory, holly,magnolia, mock orange, mulberry,pear, persimmon, quinceAlmond, apricot, cherry, elm,peach, pear, plumAlder, amelanchier, apple, ash,boxelder, butternut, catalpa, cherry,dogwood, elm, hickory, linden,London plane tree, magnolia,maple, pawpaw, peach, pecan,sassafras, sourwood, sycamore,tree of heaven, tulip tree, walnutAlder, ash, birch, boxelder,chestnut, elm, hackberry,hawthorn, hazelnut, hophornbeam,hornbeam, locust, oak, tulip tree,walnut, willowApple, aspen, catalpa, cherry,cottonwood, dogwood, hickory,holly, linden, magnolia, oak, pear,pecan, persimmon, poplar, willowAmelanchier, apple, crabapple,hawthorn, mountain ash, pear,photinia, quinceRound to angular or irregular, brown or grayish brown spots oftenwith a dark border. Black specks (pycnidia) form in older lesions.When severe, leaves turn yellow and fall early.Small dead spots that drop out leaving typical shot-holes. Gummycankers cause dieback of twigs.Small to large, roundish to angular, yellow-gray to grayish brownspots or blotches with concentric rins and dark margins giving atargetlike pattern. Affected leaves may fall prematurely. Mostcommon in shady locations.Small, circular brown spots form in the leaves. Spraying is rarely,if ever, needed to control these leaf spot diseases.Tiny, round to irregular, tan to purplish red or black spots, oftenwith a narrow dark border. The centers may drop out givingleaves a ragged or deformed appearance. Scabby spots may appearon petioles, green stems, flowers, and fruit.Small, irrgular, reddish to dark brown or gray spots with raisedblack dots (apothecia). Lesions may merge to form large deadblotches. Severely spotted leaves turn yellow and drop from mid-July to late August.
Page 1 and 2: eport onPLANTDISEASERPD No. 648July
Page 3: - 3 -Monochaetia, Mycosphaerella, P
Page 7 and 8: Table 1. Continued- 7 -Fungal Trees

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