Potted Thuja (2m) got white gooey balls at tips (scale/lice). Garden center poison worked temporarily; after vacation, tree covered, top brown. Expert: likely scale insects—hard to kill with contact sprays. Use Bayer Advanced Tree & Shrub Insecticide soil drench: mixes with water, poured at base, systemic uptake, kills in ~1 week, protects up to a year. Identical neighboring tree unaffected.
Contact sprays fail on scale; systemic wins.
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