Some of these diseases are potentially deadly, while others are usually harmless and merely cosmetic. As the colony increase in â¦ Very common in spring when new growth is emerging. Japanese Maple Trees . Japanese maple trees are commonly used in bonsai as well. The only insect pests that bother them are aphids and scales. Other types do exist but are rarer. From what Joan shared, it sounded like aphids! While you can get away with once-a-day or every other day watering during cooler periods, during the hottest times, it will need daily or twice daily watering. A black-coloured species of aphid can attack your Japanese maple tree. I have a Japanese Maple, Waterfall, which had a big branch from another tree fall on one of it's trunks about 4' from the ground. ... Japanese maples are susceptible to common pests like aphids, scale, Japanese beetles, and borers. Japanese beetles, scale, and aphids may attack Japanese maples. Aphids: You may track ants going to the tips, tender new stems or on and under leaves of tender new growth. Often I see ants, then find the aphids on the underside of some leaves and on the growth tip of a particular branch where the ants are running to and fro. Alternatively, the Japanese maple is susceptible to two other problems that cause similar leaf problems: aphids (visible on the underside of leaves), which leave a sticky residue - I use Bayer Advanced Tree and Shrub, as it kills sucking insects and fertilizes at the same time. Cause: Aphids. Poplar Trees . Aphids on maple and sycamore. Japanese maple is one of the most versatile trees for any yard, patio, or garden. Blackman & Eastop list 96 species of aphid as feeding on Acer (Maples and Sycamores) worldwide, and provide formal identification keys.. About sixteen of these are known to occur in Britain. Leaf spots and branch dieback can affect these trees but rarely kill them outright. APHIDS AND JAPANESE MAPLE TREES IDENTIFICATION Aphids are tiny insects about 3mm long with the most common types being black fly and green fly. The most common cultivar is â¦ This is an ... rather it is to raise awareness of ants on your maple = pests. Aphids, leaf cutters and rollers may appear in the spring and can be effectively treated with an approved spray. Avoid chopping any large, main roots as you donât want to disturb the main system. Growing Japanese Maples in Containers. 2 Horticultural oil may injure Japanese, amur, and red maples. The first appear on juicy, tender young shoots. Twelve are maple specialists and four are common polyphagous species ( Aphis craccivora, Aphis fabae, Aulacorthum solani, Macrosiphum euphorbiae). A Japanese maple is a glorious specimen tree. If you do not like aphids, you can squirt them off with a strong stream of water. It's relatively new to Ohio, its name is misleading, and it may be mistaken for other more familiar scales. There are a few Japanese maple diseases and several insect problems with Japanese maples that you should be aware of to give your tree the care it needs. The ants are collecting honeydew that is generated when the maple is attacked by the aphids. Oak Trees . Sycamore Trees . Newly planted trees and trees with limited growing space are particularly vulnerable to leaf scorch. Older growth has a sticky sap-like residue on the leaves. APHIDS: !! Those look to be aphids. Slow growing, this dwarf Japanese Maple features a vase-shaped habit and is ideal for containers or small gardens. However, I noticed recently that it is being attacked by hundreds of tiny bugs. 4 Malathion may cause slight injury to many maple species. Many Japanese maple roots die if the soil temperature drops below 14 degrees F. Your aphids on Acer palmatum are Californian maple aphids (Periphyllus californiensis). ... Japanese maple varieties: The diversity and popularity of Japanese maples make it virtually impossible to predict their availability in any given year. The can be sprayed off with a (gentle) jet from your garden hose OR rubbed off and crushed with a gentle pinch that doesn't crush your new leaves. 5 Neem oil may cause injury to Japanese maples. Ants are aphid farmers. Periphyllus californiensis, is not indigenous to Europe (nor to California), but is from East Asia. The white puffs have also attacked my hollies â¦ In many areas Japanese Maples are used extensively in containers on the porch or patio. Depending on the cultivar chosen, it ranges in height from 15 to 25 feet and usually has a round shape. Pests such as aphids and spider mites are â¦ A soil test every two to three years will tell you how much, if any, fertilizer they might need. Cut back up to â of the roots, starting from the outside and moving inwards. They have a purpose and it's not beneficial to you or your Japanese maples. Ants present on the leaves and stems. There are hundreds of Japanese maple varieties that come in various sizes with a large assortment of leaf shapes and colors that range from shades of green to orange, red, purple, and variegated. Aphids and Their Control. Periphyllus or maple aphid on vine maple. Synonyms Acer palmatum 'Orangeola' . Neither insect causes death, but they can cause some tan, dead areas and leaf drop. Acer palmatum 'Crippsii' is a compact deciduous shrub or small tree with a pretty foliage of five pointed, lobed, deep emerald green leaves in summer, turning vibrant orange in the fall before shedding to the ground. Japanese maples are susceptible to anthracnose, especially in rainy weather. Occasionally, Japanese maples are troubled by aphids, scale or powdery mildew, but these are easily treated and seldom kill the tree. Often grown for its unique 7-palmed green or red colored leaf, the maple also has an interesting growth habit, with a fine leaf texture and muscular-looking multiple trunks.