leaves; buds; shoots; fruits. Two pests can cause a white foamy or cottony substance to appear on apple trees: the woolly apple aphid (Eriosoma lanigerum) and the apple mealybug (Phenacoccus aceris). If you take a small twig and scrape off the fluffy coating, underneath you will see the tiny bugs feeding on the sap of the tree. White Foam on Apple Trees. It usually appears in early to mid-spring and is more prevalent during rainy weather. There are a number of other diseases that can occur from time to time on apple trees. Fortunately, home growers can avoid most diseases by planting disease resistant varieties. 17 Jun, 2009 Your garden centre can sell you a trap for the flies that is eco friendly. By Mjb. hope this is right my memory isnt what it was. Starting in late summer, early autumn, I noticed some tufts of what looks like white fluff around the twigs of my golden russet apple tree. If it doesn't fix it, you might have fruit fly. All plants are susceptible to disease if they are weak. ... if Im right they are wooly apple aphids under the fluff if I remember they atart at the roots and as the season gets warmer they travel up the tree. Apple trees are perhaps one of the most popular fruit trees to grow in the home garden, but are among the most prone to disease and problems as well. Secondly they attack the bark of a tree and not the leaves. Apple scab is one of the most common and most serious diseases that afflict apple trees. Woolly aphids congregate to create white fluffy patches on tree branches or trunk. Firstly the white fluffy coating they cover themselves with is very obvious and unusual. x x . Just like the tiny green aphids, woolly aphids are sap suckers and have created a wound in the tree so the sap will be easier to get too. The most common disease affecting apple trees is some form of Canker or other. Herts, United Kingdom . When I rubbed away the white fluff, there would be moist brownish gunk underneath. Won't get any fruit this year though. Spray with white oil all over (leaves and all) and repeat it in a fortnight. Apple tree treatments, most common diseases and pests of this fruit tree Apple (Malus domestica) it is a species that is part of the Rosaceae family. here are a few pics of the white fluff. The image shows an early attack, which can develop into large lumpy growths - affecting the tree quite severely unless treated. To reduce the likelihood of disease, make sure you plant in well-drained soil, with good air circulation around your trees and prune them correctly and at the right times of year. anyone have any idea what this is? It's a very safe spray to use if you have pets or kids. This white stuff is all over my apple tree. Apple (Malus pumila 'Granny Smith') Posted by Paul2032 Without seeing the problem first hand, I'm only guessing, but white, cottony masses on the woody parts of apple trees is often due to the presence of the Wooly Apple Aphid. Below are a few of the most common apple diseases: Apple Scab. What is this white disease on my Apple tree? Powdery mildew of apples, caused by the fungus Podosphaera leucotricha, forms a dense white fungal growth (mycelium) on the host tissue and affects:. They may cause leaf spots or mildew, or rotting of the roots and trunk. But, if you are aware of the most common growing problems, you can take steps to keep them away from your apple tree and the fruit, which means you can enjoy more and better apples from your trees. The disease stunts the growth of trees and is found wherever apples are grown. They are brownish and elongated. Apple Scab is a fungal apple tree disease, and normally appears in the later part of autumn, or early in spring. 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