Always try less toxic alternative sprays first for the control of insect pests and diseases. Insecticides labeled for use by homeowners against scale crawlers on dogwood include bifenthrin,  cyfluthrin, permethrin, lambda cyhalothrin, and malathion (see Table 1 for specific products). Fungicides for spot anthracnose will also help to control dogwood anthracnose. The dogwood tree is commonly grown for ornamental purposes, often as a standalone tree. It is popular for its exotic, bright-colored flowers. Small trees are often killed. Foliage: This is true with a host of fungal and bacterial diseases of dogwood or tiny insects that may infect or infest your dogwood tree. The newly hatched larvae, or maggots, work their way into the developing twig. To monitor for this pest, look for tiny (1/8 inch long), oystershell shaped, and brown to gray scale covers on the bark of wilting or dead branches. Caution: Pollinating insects, such as honey bees and bumblebees, can be adversely affected by the use of pesticides. The cottony maple scale is easiest to find in May and June. Thoroughly spray the trunk, major branches and any wounds on the bark. Jul 3, 2013 - Explore Rod Wilson's board "Dogwood trees", followed by 392 people on Pinterest. Monitor the crawler emergence with sticky cards, double-faced tape wrapped around a branch, or by putting an infested shoot or leaf into a baggie and watching for crawler movement. It most frequently attacks trees that are stressed or injured. The fruits are a popular food for songbirds. The flowering dogwood (Cornus florida) cultivars ‘Appalachian Joy’, ‘Appalachian Blush ‘, ‘Appalachian Snow’, and ‘Appalachian Mist’ are very resistant to powdery mildew. Most insect damage occurs on the trunk and branches of dogwoods. Septoria leaf spots are a dark brown purple in color, later developing light brown or gray centers with dark borders. Heavy infestations of this scale may cause yellowing, wilting and eventually branch dieback. Practice cultural techniques to prevent or reduce the incidence of plant diseases, including pre-plant soil improvement, proper plant spacing, crop rotation, applying mulch, applying lime and fertilizer based on soil test results, and avoiding over-head irrigation and frequent watering of established plants. There is one generation each year and immatures overwinter on the twigs. This is an armored scale and, unlike the cottony maple and calico scales, it does not produce honeydew. An early symptom of a club-gall midge presence is a wilted, deformed leaf. However, this is a sad story that seems to have a happy ending, as I'll explain in a moment. They touch other bushes (Arctic Fire Redtwig dogwood) that also appear to now have spots. Spraying during the dormant season also lessens the impact on beneficial insects that are present during the spring and summer. Leaves of dogwoods infested with the dogwood borer will often turn red and drop early. After transplanting, be sure to water as needed during the first summer and fall to avoid leaf scorch. The tree also makes a visual contribution year-round. Apply all chemicals according to directions on the label. Cankers can girdle and kill individual branches or twigs. They feed on sap by piercing the leaf or stem with their mouthparts and sucking. Anthracnose Disease. The adult is an elongate (5/8 inch long) beetle with long antennae. Begin treatment in early May and repeat four times at three-week intervals. To monitor for this pest, look for tiny (1/8 inch long), oystershell shaped, and brown to gray scale covers on the bark of wilting or dead branches. On dogwood, it can be a serious problem on young trees that are planted too deeply and on stressed, older trees. Calico scale and cottony maple scale are both soft scales and produce honeydew (a clear, sticky substance). As they grow, they will eat all of the leaf except the midrib. Even in winter, the eye-catching bark and form of the Kousa bring a unique beauty to your landscape. The wing covers have wavy, light-colored indentations. During hot, dry summer weather, prune and dispose of all dead or cankered twigs and limbs. Protect trees from drought stress, winter injury, and dogwood borer attack. If the tree is planted in full sun with limited water or under other stress, the damage can be serious. White springtime blooms and red berries last for months, followed by striking red and purple hues just in time for the autumn season. They are loved by all due to the beautiful flowers that they bear. Keywords: Trees--Diseases and pests, Master gardeners, Cornus florida. Tatarian dogwood is used as a border, mass, screen or specimen plant in landscapes. Cornelian Cherry (Cornus mas) The cornelian cherry (also known as European cornel) is a large … Small trees or individual branches can be girdled and killed in one to two seasons. A tree planted this year will reach full-size in about a decade. The use of the horticultural oil is a safer alternative to insecticides for spraying upward into a large tree (see Table 1 for specific products). When the dogwood borer moth emerges, the brown pupal skin is frequently left behind in the exit hole, indicating the presence of this pest. Winter brings showy bright red fruit for a final splash of color. Infection that begins early in the season can be devastating, and the use of fungicides may be warranted. A number of factors other than insects or diseases can contribute to the decline of dogwoods in the landscape, especially mower injury, over-fertilization, and poor growing conditions. 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