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Worm vs. Caterpillar: Clearing Up the Confusion

"Worm" is simply a colloquial name for caterpillar. BT products labeled for "worms" and those labeled for "caterpillars" contain the same active ingredient (Bacillus thuringiensis) and target the same pests. There is no practical difference.

About Gardening: Large Green Caterpillar on Shed: Luna Moth Larva; Black Fuzzy Caterpillar with Red Rings: Giant Leopard Moth Larva; Tomato Hornworm Identification & Organic Control; Bagworms on Pine: Identification and Control; Identifying Large White Grubs at the Base of a Tree; Worm Tea: How to Brew and Use Liquid Vermicompost Fertilizer; Horsehair Worm in Water Lily Pot: Harmless Curiosity; Skiff Moth Caterpillar: Harmless Slug-Like Larva; Attracting Catalpa Worms for Fishing Bait; Daphne Dieback from Phytophthora: Replant in a Pot, Not the Same Soil

Garden Articles

Preventing Fern Caterpillars on Boston Ferns

Leopard Moth Caterpillar: Harmless and Beautiful

Puss Caterpillar: Identification, Sting Severity, and Safe Removal

Walnut Caterpillar: Gregarious Feeder on Walnut and Cherry

Woolly Bear Caterpillars: Folklore vs. Science

Can You Tell a Caterpillar’s Sex? Not Until It’s a Butterfly

Managing Tent Caterpillars in Trees

Plants

Controlling Oleander Caterpillars: Life Cycle and Treatments

Wood-Boring Insects in Lilac: Understanding "Wood Worm" Concerns

Dead Tree Removal: Pull, Don't Dig Roots

Catalpa Worm Control: Using Bt for Caterpillar Management

Luna Moth Caterpillar: A Harmless Beauty

Oak Moth Outbreak Defoliating Trees: Temporary and Cyclical

Swallowtail Caterpillars on Parsley: Friend or Foe?