Full Sun or Shade for a Crimson Queen Maple, Washington State University Clark County Extension: PNW Plants: Autumn Blaze Maple, Ohio State University Plant Facts: Acer x Freemanii - Freeman Maple, Penn State College of Agricultural Sciences: Leaf Identification, University of Illinois: UI Plants: Woody Ornamentals: Acer x Freemanii 'Autumn Blaze', University of Minnesota Extension: Verticillium Wilt of Trees and Shrubs, University of Illinois Extension: Hort Answers: Red Maple, University of Minnesota Department of Entomology: Leafhoppers. In a large tree, controlling scale chemically is not always practical. The leaf blade is between 2 and 4 inches long and has a red or green petiole where the leaf stalk is attached to the stem. Since little permanent damage results from woolly alder aphids, tolerating some damage is a good choice. This tree requires iron and magnesium for the formation of chlorophyll, the photosynthetic active green pigment that is found in the leaves of all green plants. Their feeding can weaken or kill branches. To help roots access iron, work 4 inches of compost into the top 12 inches of soil well beyond the outermost branches. The sooty mold fungus grows on the honeydew, resulting in unsightly, dark fungal growth. Let’s find the problems associated with this tree as well as the diseases that this tree is prone to, which is essential to know so that you may take better care of it. Would you like to write for us? This disease is more common in the forest, but may be seen in some landscape situations. Autumn Blaze Maple Problems. Use pesticides only according to the directions on the label. Read and follow all directions on the label. You can legally root a cutting of the nearly identical Freeman maple (Acer x freemanii), a hybrid of the red maple and silver maple that was developed in 1933. The spots are irregularly round and ¼ inch in diameter. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Some are flat and appear like scales stuck to a plant, while others appear like white cottony masses. Spray with permethrin when the scales first appear and repeat every 10 days. Avoid the use of spray pesticides (both insecticides and fungicides), as well as soil-applied, systemic insecticides unless absolutely necessary. Irrigate during periods of drought. They are small and immobile with no visible legs. Bacterial leaf scorch of maple (Xylella fastidiosa).John Hartman, Bugwood.org. These tar spots affect the upper surface of the leaves during the spring season and as a result, the tree tends to shed its leaves, before fall. Karen Clark has been writing professionally since 2001. Prevention & Treatment: Heavily infested plants should be removed. In late summer, raised, tarry spots form on the yellow spots, causing leaves to drop prematurely. Aphids: Aphids are soft-bodied insects that range from 1/16 to ⅜ inch long. Spraying three times at two-week intervals with a copper-based fungicide, mancozeb, chlorothalonil, or thiophanate methyl starting when the leaves begin to unfurl in spring will provide control (see Table 1 for specific products). Woolly alder aphid (Paraprociphilus tessellatus).Bob Lepak, Bugwood.org. Sign up to receive the latest and greatest articles from our site automatically each week (give or take)...right to your inbox. It is caused by dry weather, combined with wind and high temperatures. Verticillium wilt is not the only suspect if an autumn blaze maple shows a thin crown. Table 1. Homeowners confuse anthracnose with scorch, as both problems create brown, dry leaves and can defoliate a tree. Woolly alder aphid (Paraprociphilus tessellatus) is gray to black in color. The fungal disease anthracnose, most severe in wet weather, causes leaves to turn brown and kills twigs and branches.