![]() ![]() Trunk Rot (fungus – Fomes sp., Hydnum sp., and Polyporus sp.): Refer to section on Wood Rots and shade trees. Mushroom Root Rot (fungus – Armillaria (Clitocybe) tabescens): (See section on Mushroom Root Rot) ![]() Rarely serious enough to use control measures.Ĭotton Root Rot (fungus – Phymatotrichum omnivorum): Silver maple is rated as highly susceptible to Phymatotrichum omnivorum). Powdery Mildew (fungus – Uncinula circinata): White fungus growth on leaves. Large, reddish, and varnish-like mushrooms form at the base of the infected tree. Ganoderma Rot (fungus – Ganoderma lucidum): Rapid decline and death of tree. It is thought that leaf growth is stimulated, in turn enabling the rapid formation of a thick layer of sapwood, which seals in the infected parts of the trees.Ĭrown Gall (bacterium – Agrobacterium tumefaciens): Rough, irregular, swollen galls at the base of the trunk or on the roots. Recently infected trees with only a few wilted branches may possibly be saved by adequate fertilization and watering. Trees showing general wilting of the entire tree cannot be saved. Some infections take place above ground through wounds caused by insects or by pruning. The October Glory Maple also has winter interest because the new branch growth retains a red color after the leaves drop. Infection takes place most commonly through the roots because the fungus lives in soil. October Glory Maple trees are adaptable to dry or wet soil conditions and are better adapted to the warmer Texas climate than most other Red Maple cultivar. The disease does not spread rapidly from tree to tree. Other fungi can also cause this discoloration. An olive-green discoloration may develop in the sapwood. Infected trees may die slowly or suddenly. New leaves may be reduced in size and turn yellow. Wilt (fungus – Verticillium albo-atrum) Sudden wilting and drying of leaves on individual branches, particularly on one side of the tree. Makes wonderful shade tree for smaller yards. This beautiful maple has spreading canopy with attractive foliage that turns spectacular red, redorange in late fall. Plant in areas protected from drying winter and summer winds. Reminiscent of Japanese maple but with much greater toughness. Causes: late spring frost hot, drying summer winds and drought. Foliage appears bronzed, dried and scorched. Leaf Scorch (physiological): Light or dark brown areas along the leaf margins extending toward the mid vein. Spraying with a recommended fungicide when buds begin to unfold in the spring and again in 10 to 20 days will help prevent infection. Many infected leaves drop in late spring. Leaves partially killed appear as if scorched. Areas often enlarge killing the entire leaf. Irregular, light to reddish-brown, or purplish-brown, dead areas occur on the leaves. Be sure to use light-colored wraps or guards and loosely cover the trunk instead of tightly binding it.Anthracnose (fungus – Gloeosporium apocryptum): In rainy seasons this disease may be serious on silver maples and Japanese maples. Cover the trunks of young trees with corrugated plastic trunk guards, commercial paper tree wraps or white fabric trunk wraps. Sun Protection: Young trees need a little protection from sunscald during their first three growing seasons, because the bark is still thin and has not built up its outer corky layer. Leaves vary from 3- to 5-lobed, with lobes separated by V-shaped angles. in cultivation, occasionally reaching 100-120 ft. This popular ornamental tree grows 40-60 ft. ![]() Measure the tree’s diameter 12 inches off the ground and use 3 pounds of 19-5-9 fertilizer per inch of trunk diameter. Red Maple (Acer rubrum) Large tree with narrow or rounded, compact crown and red flowers, fruit, leafstalks, and autumn foliage. A soil test determines exact nutrient needs, but in the absence of soil-test recommendations, fertilize a shantung maple in late February with a slow-release fertilizer or organic equivalent. Fertilizer: Avoid fertilizing a newly planted tree, waiting instead until the transplant has been established for at least six to eight months on its new site. Watering: Established trees are drought-tolerant, but trees (especially newly transplanted shantung maples) need to be deeply watered during dry periods. The Panhandle and the Eastern two-thirds of Texas is where these trees prosper, but they do not grow well in West Texas where the humidity is too low. Humidity: Although the USDA plant hardiness range for shantung maples is across zones 4 through 9, zone 6 is the sweet spot for optimal performance.
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