Botanic Garden >> Gardening > >> Question and Answer >> Pests

Webbing and Worms on Rosemary: Likely Funnel Weaver, Treat with BT

Webbing "spider web" killing rosemary in AZ with worm-like bugs = likely funnel weevil (small web-building insect). Treat with BT (Bacillus thuringiensis, Dipel/MVP)—organic dust for caterpillars/worms. Also effective: pyrethrum, rotenone. Sources: Planet Natural, Gardens Alive.

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