Cut down watering if you notice the problem; let the top.
Jun 29, By the beginning of June, they begin to fall off while still a discolored green or they shrivel up while on the tree branch and then fall to the ground. This begins first on the lower leaves and then extends up to the canopy. New growth will appear but generally dries and shrivels before falling. Several fungal diseases can cause apple trees to lose their leaves. Apple scab causes olive green or black spots on the leaves.
Leaves eventually drop from the tree. Rust causes orange spots on the leaves. The infested leaves will eventually drop from the tree. The alternate host for this tree is the evergreen red cedar (Juniperus virginiana). This may have been the"pine tree" your experienced gardener was. What causes these attractive trees to drop their leaves mid-summer?
The answer is a fungal disease called apple scab. A fungus called Venturia inaequalis infects crabapple leaves early in the spring. As the fungus grows in the developing leaves, it causes purplish-brown. Sep 05, Damaged leaves become curled and yellowish with lesions, eventually turning brown. Heavy disease pressure leads to premature leaf drop. Fruit infected by apple scab develops raised scab-like lesions and severely infected fruit will drop from the tree.
Crabapple varieties can vary greatly in their susceptibility to apple scab (Venturai inaequalis). Susceptible trees are often nearly without leaves. Here are some signs that show apple trees could be dying: Leaves dropping in the summer Leaves yellowing or browning unnaturally Fruits are small and/or brown No new leaf growth in the spring.