American Linden Pest Control: Merit Soil Drench vs. Foliar Spray

Two 15-year-old American lindens get chewed from spring leaf-out through summer. One arborist recommends fall Merit soil drench; another suggests foliar spray. Suspected Japanese beetles—but don't they feed in summer, not spring?

Both Approaches Valid

Merit = imidacloprid (insecticide). Contact + ingestion action. Formulations: wettable powder, granule, water-soluble packet.

Merit Profile

• Controls: Japanese beetles, white grubs, billbugs, mole crickets, weevils
• Low human/environmental toxicity; breaks down via soil microbes
• 98% grub control when applied July 1–Aug 15; water in well
• Trade names: Merit, Merit 0.5G, Merit .3G

Japanese Beetle Timing

Adults emerge early summer, not spring. Spring damage likely from other pests (caterpillars, sawflies). Merit soil drench in fall provides systemic protection for next season's early feeders.