8560 SE 172nd Ave It is about 5/8-inch long at maturity. The first symptoms that appear in the spring are spots on the leaves and flower bracts. Always try less toxic alternative sprays first for the control of insect pests and diseases. While dogwood trees are generally very low maintenance and drought resistant, saplings will usually need to be watered and the soil surrounding trees may need to be mulched regularly. It is resistant to anthracnose, powdery mildew, and other diseases, as well as having some drought resistance. For example, sprays with insecticidal soap, horticultural oil, neem oil extract, spinosad, Bacillus thuringiensis (B.t. Commonly occurring insect pests of dogwood include the dogwood borer, dogwood club-gall midge, and scales. When infection is severe, these spots can cause flower bracts and leaves to become wrinkled and distorted. During the spring and summer, caterpillars use the tree as shelter, meaning that eventually, butterflies will emerge. If spraying is required, always spray late in the evening to reduce the direct impact on pollinating insects. Crawler activity often coincides with the flush of new plant growth in the spring. Septoria leaf spots on dogwood (Cornus florida).Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, www.ipmimages.org. Prevention & Treatment: Planting resistant species and cultivars is an excellent option for managing this disease in the landscape. Like the other dogwood trees featured in this article, the kousa dogwood is known for its toughness. An early symptom of a club-gall midge presence is a wilted, deformed leaf. Similar Plants to Cornus florida 'Cherokee Princess', Cornus florida Cherokee Princess #15 6-8' (white). On severely stressed trees, drying and browning of the areas between the veins and leaf drop can occur. They most commonly occur during the wet summer months, and may become so numerous that they cover the leaves by the end of summer. Use pesticides only according to the directions on the label. Do not leave dead leaves attached to the tree. Dogwood Club-Gall Midge: The dogwood club-gall midge (Resseliella clavula) is a small fly, about 1/16-inch long. Bark sloughs off around holes on the trunk or branches. The flowering dogwood (Cornus florida) cultivars ‘Appalachian Joy’, ‘Appalachian Blush ‘, ‘Appalachian Snow’, and ‘Appalachian Mist’ are very resistant to powdery mildew. They are small and immobile, with no visible legs. The kousa dogwood grows relatively slowly, gaining approximately 12 to 24 inches in any given year until it reaches its maximum height. Caution: Pollinating insects, such as honey bees and bumblebees, can be adversely affected by the use of pesticides. Susceptible to Beetle Borers and Scales, Anthracnose, Phytophthora and Root Rot. Stellar pink dogwood is great for attracting butterflies and other beneficial insects. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. If the cambium is destroyed, branches or the entire tree will die. Proper tree care can go a long way toward keeping your dogwood tree safe from disease; however, in the Northwest, you will certainly start at a disadvantage. Since dogwood borer adults may be present from late April through July, several applications may be needed for good control. If disease is severe enough to warrant the use of fungicides, be sure that the dogwood is a valuable specimen and the spray equipment can provide good coverage. The borer is off-white in color with a reddish-brown head.
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