Answer: Lilacs can be attacked by scale insects, but these are visible all year around. Without knowing specifically what the pest is, it's hard to make a recommendation for control. How about taking a sample of the problem to your local Cooperative Extension office or Master Gardener Clinic for positive identification and some control options? Contact WSU Cooperative Extension at 206-296-3900 for a list of Master Gardener Clinic locations.
Q&A Library Searching Tips