When leaves turn yellow, either the weather has turned cold or the tree is suffering from some sort of disease and nutritional deficiencies. Leaf edges often start to die. Not at all an expert of apples, but I had curling leaves earlier this year. Over time, these can result in the yellowing of large numbers of leaves, known as chlorosis. A deficiency of magnesium is frequently seen on apple trees … Sooty Blotch – Sooty blotch is a non-lethal but blemishing fungus that affects the fruit of an apple tree. Trees often suffer from transplant shock because their roots don’t have enough room to establish themselves. Tiny, pinhead-sized insects, varying in color depending on the type. Rosy apple aphid is a frequent pest and causes yellowish green curled leaves; it can also affect the fruit (see below). The uncommon rosy leaf-curling apple aphid causes leaves to become distorted and red. When I uncurled a few, I discovered that I had an infestation of Rosy Apple Aphids. Too much? Mold that I don't know how to see the signs of? To control rust, grow resistant apple varieties and remove any nearby host plants. The severe leaf curl under is only on my Kingston blacks. I have a young apple tree that I planted this spring and the leaves are curling in. People at the local greenhouse said it could be low iron so I treated the soil with iron. Initially, it will cause stunted or delayed growth and blossoming, yellowing leaves and leaf drop. Symptoms: Leaves curl, thicken, yellow, and die. Collar Rot – Collar rot is a particularly bad apple tree problem. I have an approximately 6-7 year old dwarf Honeycrisp apple tree. Apple Tree Pests Aphids. Question: What is eating the leaves of my tree? There are several reasons for apple leaves to curl. There’s a dolgo crab and a pear within about 30 yards that seem fine. Don’t be alarmed – an apple tree may experience a few of these in its lifetime, but certainly not all at once. Here are a few things you can try: Give tree roots at least one inch of water per week. If leaves are turning color, curling or dropping in spring or summer, it can be a sign of a serious problem. Manganese deficiency commonly affects only the older foliage; young foliage is affected in more severe cases. Although there are a few yellow leaves. Apple trees typically have glossy, medium green leaves. In spring, the galls dry, releasing the spores into the air where they are carried to apple trees. Eventually a canker (dying area) will appear at the base of the tree, girdling and killing the tree. There are a couple of old macs approximately 200 yards that are also fine. Will cluster on stems and under leaves, sucking plant juices. Shocked trees also need a little TLC to get them back on track. Older infections turn black, leaves turn yellow and fall off. Rust causes yellow or orange spots on the leaves and distorted or mottled fruit. The caterpillars of a number of moth species will eat the leaves of apple trees. Most other trees show some stress - hardened leaves curling upward, some yellow on new leaves, brown spots on outside of leaves. Iron deficiency causes foliage to lose color, turning yellow with only a network of green veins. Too little water? One of them is simply fall weather, and a natural part of the growth cycle of all deciduous trees. Other ideas? I googled it and most mention insects and molds, but I don't see any evidence. Every year toward late summer leaves start to curl and yellow. Several years of early leaf loss can result in decreased growth, reduced bloom and increased susceptibility to winter injury. Several years ago they said red mites, so I sprayed tree for same, even though I didn't see any mites. Apple trees often have an overall appearance of abundance, from spring blossoms to summer fruit and leaves turning bright colors in the fall. 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