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Yellow leaf japanese maple12/28/2023 ![]() The Number of Lobes on Some Different Japanese Maple TreesĪcer palmatum leaves are palmately 5 – 7-lobed and are typically divided about to the middle, but they could be divided as much as ¾ of the way to the base.Īcer palmatum ‘atropurpureum’ cultivars are known for their leaves that resemble the type species but are always in vibrant reds, burgundy, or purple that retain their color throughout the growing season. Therefore, large teeth in a palmately lobed leaf will also never have a main midvein running to its tip. Large teeth are on the sides of the lobes because a lobe tip is never defined as a tooth. ![]() If it cuts less than ¼ of the distance to the midvein, then it is a large tooth. ![]() If the distance it cuts is more than ¼ of the distance to the midvein, it is a lobule. The distinction between a large tooth and a lobule follows the 25% or ¼ rule. In palmately lobed leaves, a lobe typically has a main vein running to it, while a lobule typically does not. So how do you know it is a lobe and not a lobule or large tooth?Ī lobule is a projection from a lobe rather than a stand-alone feature of its own. Often, the lowermost lobes are quite small, and it can be difficult to differentiate between a lobe and a lobule or a large tooth. What is the Difference Between a Lobe and a Lobule? You can use the number of lobes a leaf has and how deeply cut (also called incised or dissected) those lobes are to the leaf base to help identify the different types of Japanese Maples. ![]() Overwintering in fallen leaves, the removal of leaf debris from the garden each fall will help to remove infected plant matter and encourage the overall health of the trees.Identifying Japanese Maples by The Number of Lobes on Their Leaves Most notably, proper garden sanitation will help reduce the spread of tar spot. However, there are some ways in which growers can work to prevent infection over several years. Some factors, such as weather, may be beyond the gardener’s control. A variety of factors contribute to the spread and recurrence of this fungal infection. Due to this, treatment for a Japanese maple with tar spot is generally not required. Beyond the cosmetic appearance, most incidences of leaf spot will not cause permanent damage to the tree. The presence of tar spots on Japanese maple trees is frustrating for growers due to their appearance, but the actual disease does not usually pose a significant threat to the trees. While the color and appearance of these spots is generally uniform, the size may vary slightly depending upon which fungi has caused the infection. As the growing season progresses, these spots become larger and begin to darken. Initial signs of tar spot manifest as small, pin-sized, yellow dots on the surface of the tree’s leaves. Tar spot of maples is fairly common and, like many other foliar issues in trees, spots on Japanese maple leaves are most often caused by various types of fungus. Luckily, many foliar issues such as Japanese maple tar spots, can be easily identified and managed. The sudden appearance of spots or other lesions may leave gardeners wondering what could possibly be wrong with their plants. Known for their beautiful, color-changing foliage, growers may be understandably alarmed by the sudden change in appearance of the leaves of their maple trees.
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