Dogwood Tree Leaves Turning White
If you see the white coating and cupped leaves on your tree fungicides cannot cure the disease which is already established.
Dogwood tree leaves turning white. When a dogwood tree does not receive adequate water the leaves of the tree. Kousa dogwood trees cornus kousa are superstars in the home garden with visually lush purple to red fall foliage showy creamy white flowers and resistance to a variety of destructive diseases. On dogwood trees mycrosphaeria pulchra is the causal pathogen for powdery mildew. When leaves are falling off dogwood in summer it could mean a serious illness improper siting or cultivation problems.
The whiteflies are tiny sap sucking pests that fly off the plant when the dogwood is disturbed. During wet spring weather falling dogwood petals bracts develop mold as in the tan spots with pink haloes pictured on the left. Watering from overhead and even rainfall contributes to powdery mildew. As the disease progresses the leaves may cup or curl upward.
It is usually only cosmetic. Dogwood cornus spp is a harbinger of spring for many its large white to pink flowers smothering the plant with delicate petals even before its foliage has unfolded. There are any number of diseases and pests that can stress your dogwood and cause dogwood leaf drop. Curling deformed leaves are another sign of powdery mildew.
Powdery mildew if your dogwood s leaves were covered in a white powdery substance before they began to fade to light green or yellow and cup powdery mildew is likely the cause of your dogwood. Botrytis blight or gray mold gray mold is a common fungal disease on fading flowers. Use a water hose to spray the. If your dogwoods have a white substance on the leaves and buds powdery mildew may be the culprit.
Dogwood leaf scorch leaf scorch is a common problem in dogwood tress and a sign that your tree is under water stress. This white powdery growth is common on dogwood leaves and twig tips. Powdery mildew is a fungal disease that thrives in wet humid conditions.