M030 ACakeToRemember. Is this a different form of powdery mildew? Possible replacements for lilac can be found in the Plant Elements of Design plant database. White spots on leaves usually start to develop in mid-summer and enlarge as the summer progresses. 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? Gisele Lamontagne. Phytoplasmas: Prune affected branches. Hi Jay- We have a lilac bush which in the past has bloomed beautifully. Is there anything I can spray on the tree to save it? Q: My Lilac Bushes have black mold on them, what is it and is it harmful? Silicone flower mold, lilac mold for gumpaste lilacs. Diseases caused by Bacteria: Bacterial blight, Pseudomonas syringae. Anonymous Guest. The white substance is all over the bark of the Bush almost as if someone has painted all of the branches White. The insects excrete a sticky substance called honeydew, that unless washed off by the rain, sticky to the leaves. The gray mold fruiting stage is usually found on affected parts. OK, that was a bit flippant, but … that’s pretty much what you should do! Remove severely infected plants. powdery.mildew.lilacH.jpg. Have you noticed that many lilac leaves at this time of year are more white than green? Blighting of new shoots is black in color, starting as spots on leaves and branches which rapidly involve the entire shoot. What is this stuff and what can I do about it? Lilac leaves coated with powdery mildew. Powdery mildew is a common lilac disease indicated by a grayish-white coating on the leaves. 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. If biotic: Look for signs of insect infestation (sawdust, sap, frass) and damage like exit holes on the branches. The best way to avoid green mold growing on trees is to take of the trees’ health. This type of mold is associated with aphids, scales, and other sucking insects. The white "powder" is composed of fungal structures (mycelium and spores). Answer: Wear green-tinted sunglasses! Source: glimpsesofglory-karen.blogspot.com. Replied June 29, 2016, 8:31 AM EDT. Water and soil management, together with appropriate fertilization can enhance a healthy and thick canopy. Leaves may be distorted, small, and yellow. This year, not as nice. From shop ACakeToRemember. (George Weigel) Q: I have a lilac … For cake decorating, gumpaste flowers, or polymer clay flowers. A change in weather will clear up the trouble. It covers the branches and eventually kills them. Pruning off damaged branches could prevent further damage. By late summer or fall entire leaves may appear white. 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