Infected barks crack and secrete a sticky gum-like substance. How to Remove Moss From Trees With Copper Sulfate, Cornell University Cooperative Extension Pesticide Safety Education Program: Shade Tree Spraying Equipment, North Dakota State University: Deciduous Tree Diseases, Purdue Extension: Using Organic Fungicides, Clemson Cooperative Extension: Maple Diseases & Insect Pests, Gardenality: Leaf Scorch on Japanese Maples. Aphids usually appear on the underside of leaves. Snip off infested branches and twigs to control spread, and prune branches to open up the canopy and allow sunlight to enter. replant another Maple in the same place unless the soil is replaced since the fungal propagules can survive up to 13 years in the soil. Acer trees attract a particular set of bugs. Adult males, though very rare, have one set of wings. If cultural controls do not eradicate the problem, spraying a fungicide may be necessary to save the tree. Scales are elongated or round insects with a flat or humped bodies and a straw-like mouth-part through which they extract fluid. No substantial branches or trunks have been affected yet. They prefer to eat the outer side of leaves, especially those that are in the sun. It is important to use the correct fungicide for your particular tree fungus. What can I spray on my Japanese maple for bugs? Snip off infested branches and twigs to control spread, and prune branches to open up the canopy and allow sunlight to enter. Use a 3/8-inch diameter hose, and set the nozzle pressure to 250 to 300 PSI for full grown trees or 150 to 200 PSI for trees under 15 feet. For use as a fungicide, apply the diluted neem oil to all areas of the plant at seven-day intervals until the disease subsides. This happens in two ways. I lost a Japanese maple to this several years ago and just didn’t know what to do. 4 Malathion may cause slight injury to many maple species. Plan the perfect garden with our interactive tool →, Japanese maple image by Horticulture from Fotolia.com, famille image by guy from Fotolia.com, University of California Integrated Pest Management: Aphids, University of California Integrated Pest Management: Scales. Use a natural or chemical fungicide that is approved for use on Japanese maples. Place sticky material around the trunk of the maple tree to prevent ants from climbing and going towards the honeydew, or use ant stakes or baits. Cover infested foliage with neem oil or insecticidal soap diluted in water to remove aphids. Jill Kokemuller has been writing since 2010, with work published in the "Daily Gate City." You can spray many different types of DIY pesticides and store-bought brands, but you should always avoid using oil-based poisons. Scales are elongated or round insects with a flat or humped bodies and a straw-like mouth-part through which they extract fluid. When a Japanese maple (Acer palmatum) looks as if some of Santa's mischievous elves visited at night to decorate it with tiny, bark-, twig- or leaf-covered ornaments, suspect bagworms.Protected inside the diamond-shaped, silk-lined enclosures, bagworms infest Japanese maples wherever they grow in U.S. Department of Agriculture plant hardiness zones 5 through 8. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Follow label directions for all insecticide rates (strength in solution). Another indication is irregular blackening of the bark of twigs and branches. Snip off infested branches and twigs to control spread, and prune branches to open up the canopy and allow sunlight to enter. How to Identify Insect Damage to Maple Trees. Leaves begin to wilt, turn yellow and drop suddenly. Japanese maples are sensitive to fungicides and insecticides, so read the label before spraying to make sure the fungicide is suitable for use on your tree. Repeat applications daily to ensure complete eradication. You can apply an insecticide containing acephate, azadiractin or carbaryl to control bagworms, following the directions on the label carefully. 3 Insecticidal soap should not be applied to Japanese maples. Aphids are tiny pear-shaped insects with soft bodies, long legs, antennae and slender mouths through which they puncture leaves, stems and other plant parts and suck fluid. Chemicals that Fight Japanese Maple Fungus Treatment of the tree with a pesticide to kill the fungus is a last resort and rarely necessary. Provide Japanese maple trees appropriate irrigation so they resist scale damage. Do not exceed fertilizer application rates, as excessive nitrogen favors aphid reproduction. Less likely, though... Prevention. A strong spray of water and regular treatment with either chemical or organic pesticides will go a long way to prevent insect problems with Japanese maples. If the tree is still viable it could make new leaves this fall, but that’s not really a good thing as close as we are to freezing weather. Apply commercially available horticultural oils over large scale infestations. About all you can do is water as needed and hope for the best til spring. These ants protect the pests from natural enemies. Pay attention to any warnings on the label. On a Japanese maple, the aphids pierce the... Damage. Canker can attack through bark damage. © Copyright 2020 Hearst Communications, Inc. Depending on the cultivar chosen, it ranges in height from 15 to 25 feet and usually has a round shape. Kokemuller is an authorized substitute teacher and holds a Bachelor of Arts in English from the University of Iowa. For example, sulfur-based fungicides should not be sprayed when the temperature is above 80 degrees Fahrenheit. Thanks for this resource. This increases mortality rate of aphids and scale due to heat exposure. Predatory insects such as mites, bugs and beetles, and parasitic wasps including species of Coccophagus, Metaphycus and Aphytis help control scales biologically if homeowners prefer not to use chemical control methods. In July, adult Japanese beetles can be found in vines, leaves of lime, birch, maple, cherry, raspberry, rose bush and other ornamental plants. Spray the tree evenly. Using too much will only damage the tree; it will not be more effective in treating the fungus. Native to Korea, Japan and China, the Japanese maple (Acer palmatum) is prized for its foliage that turns yellow, orange, red or purple in fall. Once you have sprayed one side from top to bottom, work your way around the tree, coating all the foliage. Mix the fungicide according to the label instructions. Maple trees (Acer sp.) Soft scales secrete abundant amounts of a sticky honeydew exudate that attracts ants. Aphids are tiny pear-shaped insects with soft bodies, long legs, antennae and slender mouths through which they puncture leaves, stems and other plant parts and suck fluid. Scales form masses of cotton-like white substance on the lower side of stems and branches of infected Japanese maple trees. Japanese maples are susceptible to fungal diseases such as powdery mildew. Keep in mind that those Japanese beetles, which have already settled on your lawn, attract their kin there. Scales form masses of cotton-like white substance on the lower side of stems and branches of infected Japanese maple trees. All Rights Reserved. Soft scales secrete abundant amounts of a sticky honeydew exudate that attracts ants. PSEUDOMONAS: ! Prefers organic rich well drained soil. Learn which plants thrive in your Hardiness Zone with our new interactive map! Tanya Khan is a freelance author and consultant, having written numerous articles for various online and print sources. This increases mortality rate of aphids and scale due to heat exposure. Foliage opens bright red before turning purple-red and then bronze-green by the end of summer finally finishing with fiery orange-red in fall; a more vigorous 'Bloodgood' type. Wear a face mask and goggles to prevent falling spray from getting in your mouth or eyes. She has a Master of Business Administration in marketing but her passion lies in writing. Aphid infestations are most common during the spring, when Japanese maples grow new leaves. are known for the sharp points on their leaves. Provide Japanese maple trees appropriate irrigation so they resist scale damage. The most common Japanese maple diseases are caused by fungal infection. Determine the type of fungus on the maple tree.