Most pecan diseases are caused by pathogenic fungi that remain dormant during the winter months on twigs, leaves, nut shucks, and bark, either in the tree or on the soil. Pecan trees (Carya illinoensis) are a large tree with fragrant leaves that grows in U.S. Department of Agriculture plant hardiness zones 5 through 9. Nearly always the first signs of problems start in the leaves, so keeping an eye on pecan foliage is the best way to spot problems early and prevent them from spiraling out of control. For a complete background on how to grow pecan trees, we recommend starting from the beginning. Note: many things can cause stunted trees. In early spring, under warm humid conditions, the fungi begin active growth and produce conidia (spores) that are disseminated to growing tissues by wind, rain, and insects. Consult County Extension Agent; Scab Shake infected leaves from the tree onto a … These small bugs appear in late summer, burying their eggs into the soft outer shell of the young fruits. 2010). Most pecan varieties which are maintained in a vigorous state of growth are not as susceptible to this disease. More than likely, the black spots you see on pecan leaves and shucks are due to pecan scab. Pecan trees are prone to fungus diseases such as scab, powdery mildew, crown gall and wood or heart rots, according to the North Carolina Cooperative Extension Service. Crown Gall. & H., it is a widespread disease throughout the industry. Damage . Control. A common reason for asking about pecan tree leaves is disease. This is the result of feeding by an aphid-like insect called phylloxera, which causes rapid and abnormal growth of young leaf tissue to surround and enclose the female (called a stem mother). Virus diseases. Ornamental cherry trees are especially vulnerable to leaf spot. Pecans are commonly grown all over Texas, for both commercial purposes and in private yards. Infected leaves develop spots, then turn yellow or brown and drop off the tree. Disease Treatments. Many of you may have noticed pecan trees with wart-like galls on the leaves. Symptoms of the disease appear as small, dark lesions on the leaves, twigs and shucks. Pecan diseases can diminish the yield of a pecan tree and even kill it. Trees appear stunted and slow growing; leaves may be reduced in size, little or no fruit. As the disease progresses, the lesions can expand and grow together. Pecan Anthracnose has been reported as far back in time as 1914 (Rand 1914), and as far away as Argentina (Mantz, Minhot et al. The easiest way to see the fungus actively producing spores is by using a hand lens. Pecan Leaf Scorch Mite Feeding causes “scorching” effect on leaves Mites are usually found on underside of leaflet Infestations often start low in the center of the tree Symptoms look like some diseases Dicofol, Vendex, Temik provide control Glomerella cingulata has two anamorphs which cause disease on pecan trees, Colletotrichum gloeosporioides and Colletotrichum acutatum (Latham 1995). Control . In seasons favorable for brown leaf spot development, pecan trees may be completely defoliated within 3 to 4 months if the disease is not controlled. If tree is dead, inspect roots for hard, woody ‘tumors’. Although these are tough trees they are very appealing to parasites, especially the pecan weevil, an insect which likes the sweet nuts just as much as we do. Pecan Trees & Trunk Disease. It spreads rapidly during cool, wet spring weather, when new foliage is developing. 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