4-5 willows in Michigan with first-time willow leaf beetles; too tall to spray; asking if they'll go away or return yearly, and if untreated will kill trees.
Bayer Advanced Tree and Shrub Insect Control soil drench—systemic, 12-month protection, no spraying. Takes weeks to reach canopy depending on water. One application protects all season.
Won't kill trees but repeated defoliation weakens growth. 2-4 generations/year. Beetles disappear after cycle but return next generation. Bayer protects against subsequent generations.
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