Dogwood Tree Disease Powdery Mildew

The shoots are also killed in this disease.

Dogwood tree disease powdery mildew. Powdery mildew is a common fungal disease of trees and shrubs in minnesota. Sadly many dogwoods are susceptible to a fungal disease called powdery mildew. The infection is manifested in the form of leaf spots and stem cankers. In the southeast powdery mildew on dogwood is known to be caused by two different fungi microsphaera and phyllactinia.

Prune out dead limbs. The initial symptoms appear as medium to large purple bordered leaf spots and scorched tan blotches. How to get rid of powdery mildew on dogwood. 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.

We are recommending that you spray at least 6 hours prior to a rain. Most of us enjoy the spring blooming of the white to pink flowers of dogwood trees. Powdery mildew usually attacks dogwood from mid to late may until frost in tennessee. The canker slowly girdles the tree.

Variations in powdery mildew disease susceptibility occur within cornus species hybrids and cultivars. Florida flowering dogwood is highly susceptible to powdery mildew with the exception of cultivars jean s appalachian snow key s appalachia mist karen s appalachian. Sericea is very susceptible to powdery mildew. Water no later than mid morning to reduce the humidity immediately around the dogwood.

Powdery mildew is a powdery white to light gray colored fungus that will grow on succulent stems leaves buds and flowers. For fungicides to be effective they must be applied as soon as symptoms are noticed. During this time the tree flowers and fruits profusely but eventually dies. Deprive powdery mildew of excess succulent dogwood growth to feed on by avoiding fertilizers with high nitrogen content.

These are systemic fungicides as are bayleton and cleary s. Remove the infected tree and do not replace it with another woody ornamental until the soil has been fumigated and aerated. One of the very common diseases of dogwood trees is the dogwood anthracnose which is caused by the fungus discula sp. Apply a fungicide to protect plants.

Mulch the tree. 2 disease management powdery mildew on dogwoods can be managed easily with a variety of options. There are many powdery mildew diseases on many of the different plants that we grow but they don t go back and forth across the different species. It can cover the leaves and infect young buds shoots and flowers dwarfing developing leaves and blooms and causing distortion and even death.

Young plants and new growth are usually more severely damaged than older plants leaves or branches. White to gray powdery spots blotches or felt like mats form on leaves stems and buds of infected plants. Banner maxx rubigan and eagle have provided better control over previously recommended fungicides.