If your tree is losing leaves in early summer (June) or late summer (August), find out why. Mechanical injury to leaves, flowers, and nuts from hail and wind may cause premature dropping as well. Many of the nut trees, such as the hickories and walnuts, have compound leaves with a large number of narrow leaflets attached to a central stem known as a rachis. Older spots will turn gray and concentric circles will form within the spot. The rest of the tree is beautiful and blooming. We have many pecan and other trees on the property (we're not growers). A pecan with brown spots on leaves may be suffering from this fungus, but it also could be cultural, chemical or even pest related. Growers take care of their trees with fertilizer and zinc and not only do the trees put on a heavy crop of leaves but also a good nut crop. The leaves have been turning yellow and brown and moving down the tree at least another twelve to fourteen inches. Second, I’ve seen lots of pecan trees that lose leaves and also limbs when they don’t get enough water. The yard appears not to have been cared for. The pecan (Carya illinoiensis) is susceptible to leaf browning for the same reasons as any other tree: disease, insufficient water and improper growing environment. If the disease is not controlled the tree will lose its leaves. Or if you're seeing tree leaves lose leaves early in the fall, click here! Early pecan scab infection of young nuts will cause nuts to drop and is a major cause of pecan crop failure. As the nuts begin to fill in August, it is simply too much for the limb to carry and the branches come tumbling down. Maybe they did rake all the leaves up, but the evidence is not there. Hello, two pecan trees around our house just started dropping leaves with black blotches on them. The huge trees on our acreage date from the 1950's. The areas where pecan trees are grown are warm and humid, two conditions that favor the development of fungal diseases. Depending upon the variety and climate, harvesting pecan trees takes place from late September through November. do walnut and pecan trees lose their leaves in the fall? If it is a young tree and you want to check for damage, use your fingernail to scratch the bark off of a small section of one of the younger twigs and see if the underlying wood has a yellow or green appearance. I had a rubber mat around the tree to keep weeds under control and when I lifted it there were ants and a huge amount of eggs under it. The leaf fall is most likely a result of the current drought following on the heels of ample spring rains. We spent the winter cleaning up all the leaves under the trees. Pecan cercospora is a common fungus that causes defoliation, loss of tree vigor and may affect the nut crop. Pecan trees are normally cold hardy in most places in Georgia. Before the nuts begin to drop, they look nothing like the finished product – light brown, dark-striped nuts. We outline why oak, maple and ash trees lose leaves in summer. I see little evidence that there was a heavy leaf falling from previous years in the back yard of this house. Trees that produce nuts and lose their leaves in winter include the black walnut, bitternut hickory, shagbark hickory, pignut hickory, pecan, hazelnut and butternut trees. We are just north of Pearland, TX. I’m seeing lots of area trees shedding leaves as the drought goes on here. However, pecan leaves are too thick and rigid to wilt, so leaves will start yellowing, followed by drop. It is most likely ok and normal seasonal leaf drop. Statuesque and stately pecan trees begin to shed their nuts in the fall, prior to leaf drop. After the leaves are lost, producers may not be able to see further damage until death occurs, which may take two to five years. Leaves Signs/Symptoms. 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