A deep watering every 10 to 14 days should be sufficient (just check to see you’re not in a water ban during drought season). Rarely does periodic summer drought cause drop of the leaves at the top of the tree or tips of the branches. Trees most commonly impacted by chlorosis include white oak, red maple, pin oak, river birch and white pine. The tips of branches often curl into a shepherd's crook. Another issue known as “transplant shock” can lead to wilted and brown leaves. The reasons can be fairly natural and simple, so don’t panic – just get out the hose! Cause Some leaves go brown from natural causes â evergreen leaves, for example, are long-lived, but are replaced every few years. Dealing with Stressed Out Plants and Early Leaf Color Change However, natural replacement is usually confined to lower and older leaves, and those within the foliage or canopy. This can be aggravated by problems such as lack of water, too much fertilizer, damage to roots, and exposure to strong wind, all of which can stress the tree and leave it vulnerable to the sun. In summer, extremes of high heat followed by cooler temperatures cause nutrient imbalances. While I know this is normal in the fall, the neighborhood trees planted at the same time are still green. Maybe 25% of the tree turns yellow (as early as June) and then the leaves drop to the ground. The probable reasons for this are lack of water, drainage issues, quality of soil, diseases, and pest infestation. Don't assume you need to water a tree more just because it has brown leaves when its foliage would normally be green. Brown leaves on the inner part of Emerald cedars are normal during fall and spring, but leaves turning brown at the outer tips of branches can indicate serious problems. Leaves that are not photosynthesizing are not aiding in the tree's process of growth; this failure to photosynthesize stops the production of nutrients and energy for growing fruit, which leads to weak or emaciated apples. In winter months, arborvitae tree leaves can turn brown due to freeze injury and winter burn. Don’t be too alarmed about the situation. If you notice oak tree leaves turning brown and falling off, it is high time to correct the root cause of this problem. Young trees are especially susceptible to sun overexposure, so it's advisable to plant them in the spring or fall when UV rays are less intense. Many trees need a significant amount of watering, especially if they're young or newly transplanted. This is caused by drought conditions forcing the tree to use its water stores faster than it can absorb more from the soil. One of the best parts of spring and summer is watching your tree go from a dormant state into lush greenery. Over-fertilizing can burn your tree's roots or foliage, and in some extreme cases, the tree may die. If a tree is planted in compacted soil or clay, the lack of space for the roots to expand makes it difficult for the tree to thrive. Deciduous trees will see the leaves eventually curling and turning crunchy, but don’t think they’re the only ones susceptible to leaf scorch – any coniferous trees on your property can suffer in their needles, too. In some cases, cheesecloth can be applied to the tree's branches to add a layer of protection. insect pests; animal pests; bacteria; fungi; Abiotic factors are external events or conditions that affect a tree, such as mineral deficiency, drought, and temperature.. Insects, Pests & Diseases That Cause Leaf Yellowing In the case of leaves turning brown, curling up, and falling off, leaf scorch may be the likely culprit.