Maintaining healthy dogwood trees by following the recommended cultural practices is the first line of defense in reducing any of these problems. These sucking insects can include aphids and scale insects and sooty mold may occur on any tree but is most commonly seen on boxelder, elm, linden, and especially maple trees. Having black spots pop up on your prized plants is alarming, especially when those plants are garden centerpieces such as hydrangeas (Hydrangea spp.). The list below shows common and important tree problems. borers, ash yellows; Beech. Botrytis blight or gray mold Gray mold is a common fungal disease on fading flowers. When choosing dogwood for landscaping, be sure the trees are healthy. Its leaves look brown every year and it has not yet flowered. Let’s look at what lichen on tree bark means and what the treatment for tree lichen is. Prevention of Dogwood Tree Bark Disease. Tree Disease and Insect Guide for Hardwoods. Trees that are already stressed due to improper growing conditions … Powdery mildew is a common fungal disease of trees and shrubs in Minnesota. I thought it was drought stressed, so this season I really kept on top of watering it with a soaker hose. When they do, rake and remove them from the landscape. The black spots on the oak leaves sounds like a fungal disease. They tend to be considered either a fortunate blessing or a frustrating pest. Lichens on Trees. Ash. Tree lichens appear on many trees. The affected leaves will fall off the tree. White to gray, powdery spots, blotches or felt-like mats form on leaves, stems and buds of infected plants. Disease is often most severe on young leaves and green shoots. It is usually only cosmetic. Airborne sooty mold spores landing on and consuming the honeydew form layers of greasy, black fungus. It's a sad fact but a lot of Dogwood trees in America are getting sick and in many cases dying from Dogwood Anthracnose, a disease that mainly infects flowering and Pacific Dogwood (Cornus florida and C. nuttallii). This white, powdery growth is common on dogwood leaves and twig tips. It was planted about three years ago in what I now realize is a very hot afternoon sun location (probably not ideal). Bark-Feeding Bugs Lichens are commonly found on trees and are frequently misinterpreted as being a sign of decay within the tree. However, this is a sad story that seems to have a happy ending, as I'll explain in a moment. beech bark disease, beech blight aphid; Cherry. Trees are susceptible to a variety of different pathogens like blight, rust, scab, leaf spot, black spot and mildews. If any trees are contaminated, they will infect other trees and plants in the landscape. A white coating on the leaves of your dogwood is probably powdery mildew. Be sure to select a good site in the yard. Sooty mold doesn't penetrate leaf or stem tissue, but it may block enough sunlight to interfere with photosynthesis and weaken the plants. Lichens on trees are unique and harmless but some may consider them unsightly. If the weather is not quite so wet next spring, the new leaves should be healthy. Pests or conditions that affect many host species are listed only under the most common host(s). Fungal spores spread easily from splashing water, insects, animals and garden debris. The best site promotes rapid drying of foliage and has good-draining soil. Dogwoods are dying. During wet spring weather, falling dogwood petals (bracts) develop mold, as … The pathogens are dark fungi growing either on the "honeydew" excreted by sucking insects or on exuded sap material coming from leaves of certain trees. 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