However, the River birch develops chlorosis in alkaline soils with a pH higher than 6.5. add interesting architectural form to your garden landscape. Other disturbances in the soil cause chlorosis as well. Spraying the birch with iron folate will solve the immediate problem, but you should test your soil to ensure the long-term issue is addressed to avoid future yellowing of the birch's leaves. The leaves are ovoid and the flowers are yellow. This is most likely the reason for yellowing leaves in river birch trees. According to the Forest Service of the United States Department of Agriculture, most birch trees grow better in acidic, or low alkaline, soil. Birch trees (Betula spp.) Lady Bird Johnson Wildflower Center: Betula Nigra, Missouri Botanical Garden: Iron Chlorosis, University of Wisconsin Extension: Birch Tree Care, University of Alaska Fairbanks Cooperative Extension Service: Transplanting Trees Successfully. But it derives its common name not from the color of its foliage, but rather from the color of its peeling bark. Clay soil is particularly problematic with regard to drainage; the soil either repels water with a hardpan created by the baking sun or creates pools where water stands around the base of the tree. If it's still summer and your birch tree leaves are turning yellow, the tree is telling you it has a problem. To make the soil less alkaline, spread 2 to 4 inches of compost. If your birch isn't receiving sufficient iron, the leaves of your birch tree will emerge as yellow and may be stunted or contorted. I'm attaching some pictures of the overall appearance of the tree and the leaves to help with the diagnosis of my tree's problem. River birch, or red birch, trees (Betula nigra) require planting in part shade. Another of the attractive non-white birch trees is the yellow birch (Betula alleghaniensis). At first it was just near the bottom of the tree, but now it seems to have spread further to the top. Birch trees require iron to grow and produce leaves. Why Do Leaves Turn Yellow on Cottonwood Trees? Will 5G Impact Our Cell Phone Plans (or Our Health?! Leaf rust, leaf spot and anthracnose are viruses that cause yellow blotches and spots that eventually cover leaves. Iron chlorosis is common in river birch trees. For instance, birch trees do not like compacted soil because they have shallow root systems. Compacted soil damages the root system, which prevents the tree from absorbing nutrients and turns the leaves yellow. Carolyn Williams began writing and editing professionally over 20 years ago. Run down the checklist below to help diagnose your tree. Ideally, the pH of the soil should be between five to 6.5. According to the University of Illinois, chlorosis occurs because of an iron deficiency, poor drainage, damaged roots, high soil alkalinity, compacted roots and nutrient deficiencies. The confusing part is that your soil may contain sufficient iron: Iron chlorosis occurs if the iron isn't available in a form that the birch's root system absorbs. Some birch trees turn yellow when exposed to excessive heat. If it's established and shade trees near it have recently been removed, build a shade structure or plant a fast-growing tree near it to protect the birch from excessive sun conditions. Work compost into the soil near the roots and check your watering to ensure you're not providing too much and creating a puddle around your birch. If your birch was planted just a few months ago and you're seeing yellow leaves occur, prune the top quarter to third of the tree. Minimizing requirements helps the birch recover and maximizes its potential to survive the transplant. Birch leaf miner and bronze birch borer are the main insect pests affecting birch trees. Birch tree leaves often turn yellow because of chlorosis, which occurs for several reasons. Yellowing leaves on your birch tree in summer suggest that the soil isn't draining properly. According to the University of Illinois, chlorosis occurs because of an iron deficiency, poor drainage, damaged roots, high soil alkalinity, compacted roots and nutrient deficiencies. Early stages of leaf miner and birch borer attacks may show up as spotty yellow blotches. Alternately, inject the birch's trunk with iron cholate or iron sulfate. They allow their leaves to turn color and drop as a protective measure. Bronze birch borers (Agrilus anxius) are pests that may lead to yellowed leaves on birch trees. Thus, if a pool of water remains around the tree after watering, poor drainage and wet soil is the cause of the chlorosis and yellowing leaves. My birch tree has had patches of leaves turn yellow and drop since the beginning of July. ), The Secret Science of Solving Crossword Puzzles, Racist Phrases to Remove From Your Mental Lexicon. According to the Forest Service, birch trees prefer moist soil that is not overly wet. The tree likes Sun to half-shade at the location and the soil should be undemanding, like loamy soils.
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