Unsightly calluses and sunken areas on maple tree trunks and bark are caused by canker diseases. Close-up of a female beneath its waxy test. Leafhoppers and spittle bugs carry the bacteria from tree to tree. 2 Horticultural oil may injure Japanese, amur, and red maples. Infections capable of killing these plants tend to attack a tree’s internal systems, invading via the roots. Of all the Japanese maple problems dead branches can be one f the most alarming. Regardless of its color, when a maple's bark develops white spots, the tree may be fighting disease. 1 Acephate may damage red and sugar maples. Figure 2. Various leaf spot diseases caused by fungal infection (like Phyllosticta and Septoria fungi) are found on Japanese maples, causing visible spots on the surface of leaves. Japanese maples and maple species are very susceptible to this disease. Additionally, the clusters of white prunicola scale and white peach scale male's waxy covers give the host plant bark a white, woolly appearance. The wood of affected plants shows a gray to olive-green streaking if the bark … My Japanese Maple of 15 year is loosing its trunk bark. Leaves wilt and branches die. Maple Tree Diseases. Often triggered by a wet spring season, this fungal infection may spread on your Japanese maple tree… The female Japanese maple scale has an elongate, grayish white, waxy cover. maple, cottony camellia, oleander, and cottony taxus scale. Common to maples, the fungal pathogens enter the trees through wounds. A: The problem of bark splitting on maples is a common one, especially in this part of the country. Some varieties of Japanese maple (Acer palmatum, which grows in USDA zones 5b through 8), for example, have red, green or yellowish bark. The disease begins in bark layers, then extends into inner wood and often leaves oozing, wet areas on the bark. Bleeding canker: Reddish-brown cankers develop in the inner bark of the main trunk and branches. Promote plant vigor by protecting the tree from stresses. The inside of the tree at the base is fully exposed. Life History Phytophthora cactorum I have put chicken wire around it for now to protect it and am thinking about using tree … The short answer is the splits will not likely cause harm, but let's go in detail. May not injure silver maple. Verticillium is a soil fungal disease that can cause a wilting or dieback of branches and can lead to the tree dying. Note the purple color of this life stage. Every summer we get a few questions about blemished or discolored leaves on Japanese Maples, which are most often symptoms of leaf scorch, a noninfectious disease or disorder that occurs most often after prolonged periods of dry and windy hot weather or bright sunshine, when the roots of a tree, especially young or recently planted trees which have yet to develop a substantial root system, … The bark over the canker becomes sunken, and reddish-brown sap oozes out. Aphids often feed on leaves producing honeydew that encourages the growth of black sooty mold fungus on other leaves or on surfaces beneath the tree. I am not sure what to do or why this is happening. These types of health conditions generally affect the leaves, producing unsightly leaf spots and barren tree limbs. An annual pruning of Japanese maple trees and shrubs to remove dead or dying branches and to keep the tree… Any advise would be GREATLY appreciated. 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