Sooty Blotch – Sooty blotch is a non-lethal but blemishing fungus that affects the fruit of an apple tree. This website will help you identify apple varieties. There is much more to identifying tree leaves than just by their shape. By itself, this leaf information will not identify this tree. Leaf Identification | Identify Trees by Their Leaves. The trees are also susceptible to powdery mildew, scale, fire blight, rust, apple scab, canker and leaf spot. Also, if you knew how unusual it is to have serrated leaves that curl under like this tree… On the lower side of the leaves appears some small, grey spots. Apple identification. Also, the margins of these leaves can be smooth, serrated, notched, or lobed. Eventually a canker (dying area) will appear at the base of the tree, girdling and killing the tree. Apple scab produced by the Venturia inaequalis. Collar Rot – Collar rot is a particularly bad apple tree problem. If you have an unknown apple variety that you want to identify you can compare the key features you see on it with dozens of attributes and variety characteristics listed on this website. This disease attacks all the aerial organs of the tree. Tree Leaf Identification. Also, mice and rabbits chew on the trees' bark during winter. However, you could if you knew how rare it is that the tree you are looking at, although not a conifer, has flowers that become inch-long cone-like fruits containing seeds. Fire blight is a serious problem that can destroy affected trees. Click on leaf images to enlarge. Trees infected with apple scab are unsightly but the damage is more far-reaching. If a tree loses its leaves prematurely, and if that happens several years in a row, the tree will become weaker—its growth will be affected, it will bloom less, it will be more prone to winter injury, and more susceptible to other diseases and pests. If the attack is strong the tree losses the leaves from the summer. The spots will grow, and will cover with a velvety mycelium. Ovate-shaped tree leaves can be rounded, elongated, or taper to a point. Initially, it will cause stunted or delayed growth and blossoming, yellowing leaves and leaf drop. Damage from Apple Scab . Pests that attack the trees include the Japanese beetle, borers, mites and aphids.