Curling boxwood leaves with off-color foliage (but no yellowing) point to boxwood psyllid (Cacopsylla buxi)—a tiny sap-sucking insect that attacks tender new growth in spring. Feeding stunts shoots and causes leaves to cup, curl, and eventually yellow. White, waxy filaments often appear around affected leaves.
Fortunately, psyllids rarely cause serious long-term harm to established boxwoods. The damage is primarily aesthetic, affecting the current season's growth.
Kathy recommends Bayer Advanced Protect & Feed Granules—a dual-action product combining systemic insecticide with fertilizer. Applied to soil around the shrub and watered in, roots absorb the insecticide and translocate it to foliage. When psyllids feed, they're eliminated.
Check local nurseries for availability. The product link: Bayer Advanced Tree & Shrub Protect & Feed.
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