Twigs forming the brooms are abnormally upright and often retain green leaves too long in the autumn and die back in winter. By late summer or fall entire leaves may appear white. OK, that was a bit flippant, but … that’s pretty much what you should do! Source: glimpsesofglory-karen.blogspot.com. The best way to avoid green mold growing on trees is to take of the trees’ health. Blighting of new shoots is black in color, starting as spots on leaves and branches which rapidly involve the entire shoot. Hi Jay- We have a lilac bush which in the past has bloomed beautifully. The white "powder" is composed of fungal structures (mycelium and spores). (George Weigel) Q: I have a lilac … Is there anything I can spray on the tree to save it? M030 ACakeToRemember. Remove severely infected plants. This year, not as nice. Possible replacements for lilac can be found in the Plant Elements of Design plant database. Powdery mildew is a common lilac disease indicated by a grayish-white coating on the leaves. Water and soil management, together with appropriate fertilization can enhance a healthy and thick canopy. The insects excrete a sticky substance called honeydew, that unless washed off by the rain, sticky to the leaves. From shop ACakeToRemember. The other day I went to trim it a little and noticed that some of the bark has a powdery mold, some of the areas of branches are dying. Leaves may be distorted, small, and yellow. Pruning off damaged branches could prevent further damage. Cheryl A: Cheryl, It sounds like sooty mold. Diseases caused by Bacteria: Bacterial blight, Pseudomonas syringae. The white substance is all over the bark of the Bush almost as if someone has painted all of the branches White. This type of mold is associated with aphids, scales, and other sucking insects. 5 out of 5 stars (5,028) 5,028 reviews $ 10.00. Answer: Wear green-tinted sunglasses! White spots on leaves usually start to develop in mid-summer and enlarge as the summer progresses. If biotic: Look for signs of insect infestation (sawdust, sap, frass) and damage like exit holes on the branches. Phytoplasmas: Prune affected branches. The whitish appearance is caused by the powdery mildew fungus. Gisele Lamontagne. Lilac leaves coated with powdery mildew. Replied June 29, 2016, 8:31 AM EDT. It covers the branches and eventually kills them. The gray mold fruiting stage is usually found on affected parts. There's some kind of green-blue scaly looking mold attacking the red maples and lilac bushes in my yard. powdery.mildew.lilacH.jpg. I was at my parents house last night and looked at the Lilac bush and I did not see the white substance on the leaves. What is this stuff and what can I do about it? Question: I have lilacs and every year at the end of the summer leaves are coated with a whitish powder.What can I do to stop this? Is this a different form of powdery mildew? 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