The county offices have been receiving lots of slug calls with the consistently wet weather we've had. Another option is to place a barrier of sand around desirable plants. Slugs do not like to crawl over a rough surface. Crawlers are beginning to settle at the base of needles and begin feeding. They are now vulnerable to insecticides.
Merit works well as a foliar spray.
Soil applications of Merit now will not start working until late summer. Soap or oil work well if you get thorough coverage. European fruit lecanium scale crawlers have been found on the undersides of honey locust leaves. Beneficials usually control this scale, but if infestations are high, use a foliar oil spray. Heavily infested trees may experience stunted growth, yellowing leaves and dieback.