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