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