Too much? The severe leaf curl under is only on my Kingston blacks. Every year toward late summer leaves start to curl and yellow. The fungus develop in large galls or growths found on the host plant. Apple trees often have an overall appearance of abundance, from spring blossoms to summer fruit and leaves turning bright colors in the fall. Symptoms: Leaves curl, thicken, yellow, and die. Iron deficiency causes foliage to lose color, turning yellow with only a network of green veins. What to Do About Newly Planted Tree Leaves Wilting, Turning Yellow or Browning. Rust causes yellow or orange spots on the leaves and distorted or mottled fruit. Sooty Blotch – Sooty blotch is a non-lethal but blemishing fungus that affects the fruit of an apple tree. Manganese deficiency commonly affects only the older foliage; young foliage is affected in more severe cases. Don’t be alarmed – an apple tree may experience a few of these in its lifetime, but certainly not all at once. Collar Rot – Collar rot is a particularly bad apple tree problem. Apple Tree Pests Aphids. Leaf edges often start to die. Several years of early leaf loss can result in decreased growth, reduced bloom and increased susceptibility to winter injury. I googled it and most mention insects and molds, but I don't see any evidence. Trees often suffer from transplant shock because their roots don’t have enough room to establish themselves. Mold that I don't know how to see the signs of? Not at all an expert of apples, but I had curling leaves earlier this year. Initially, it will cause stunted or delayed growth and blossoming, yellowing leaves and leaf drop. Apple trees typically have glossy, medium green leaves. A deficiency of magnesium is frequently seen on apple trees … Here are a few things you can try: Give tree roots at least one inch of water per week. There are a couple of old macs approximately 200 yards that are also fine. When I uncurled a few, I discovered that I had an infestation of Rosy Apple Aphids. Question: What is eating the leaves of my tree? Other ideas? Eventually a canker (dying area) will appear at the base of the tree, girdling and killing the tree. I have an approximately 6-7 year old dwarf Honeycrisp apple tree. Most other trees show some stress - hardened leaves curling upward, some yellow on new leaves, brown spots on outside of leaves. I have a young apple tree that I planted this spring and the leaves are curling in. There’s a dolgo crab and a pear within about 30 yards that seem fine. Older infections turn black, leaves turn yellow and fall off. Rosy apple aphid is a frequent pest and causes yellowish green curled leaves; it can also affect the fruit (see below). Will cluster on stems and under leaves, sucking plant juices. Tiny, pinhead-sized insects, varying in color depending on the type. 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