The disease begins in bark layers, then extends into inner wood and often leaves oozing, wet areas on the bark. Maple Tree Diseases. The bark over the canker becomes sunken, and reddish-brown sap oozes out. Leafhoppers and spittle bugs carry the bacteria from tree to tree. Additionally, the clusters of white prunicola scale and white peach scale male's waxy covers give the host plant bark a white, woolly appearance. An annual pruning of Japanese maple trees and shrubs to remove dead or dying branches and to keep the tree… Promote plant vigor by protecting the tree from stresses. Phytophthora cactorum I have put chicken wire around it for now to protect it and am thinking about using tree … Life History My Japanese Maple of 15 year is loosing its trunk bark. maple, cottony camellia, oleander, and cottony taxus scale. May not injure silver maple. I am not sure what to do or why this is happening. Note the purple color of this life stage. Leaves wilt and branches die. The short answer is the splits will not likely cause harm, but let's go in detail. The female Japanese maple scale has an elongate, grayish white, waxy cover. These types of health conditions generally affect the leaves, producing unsightly leaf spots and barren tree limbs. The majority of maple tree diseases are purely cosmetic and don’t threaten the life of the tree. A: The problem of bark splitting on maples is a common one, especially in this part of the country. Any advise would be GREATLY appreciated. The wood of affected plants shows a gray to olive-green streaking if the bark … Close-up of a female beneath its waxy test. 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, … Unsightly calluses and sunken areas on maple tree trunks and bark are caused by canker diseases. 1 Acephate may damage red and sugar maples. Important Notes: Chemical control of diseases and insect pests by sprays on large trees is usually not feasible since adequate coverage of the foliage with a pesticide cannot be achieved. Of all the Japanese maple problems dead branches can be one f the most alarming. 2 Horticultural oil may injure Japanese, amur, and red maples. Figure 2. Bleeding canker: Reddish-brown cankers develop in the inner bark of the main trunk and branches. Common to maples, the fungal pathogens enter the trees through wounds. Infections capable of killing these plants tend to attack a tree’s internal systems, invading via the roots. Some varieties of Japanese maple (Acer palmatum, which grows in USDA zones 5b through 8), for example, have red, green or yellowish bark. The inside of the tree at the base is fully exposed. 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. Regardless of its color, when a maple's bark develops white spots, the tree may be fighting disease. 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. 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