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Tomato Hornworm Prevention: Row Covers and Sprays

Row covers before moth flight (dusk) can block egg-laying. Remove for pollination.

Integrated Approach

Cover at night, uncover day (or use insect netting).
Spray Bt (Bacillus thuringiensis) weekly—organic, caterpillar-specific.
Hand-pick at night with UV flashlight (they glow).
Till soil in fall to destroy pupae.

Bt + night scouting = best control without broad insecticides.

Growing Vegetables: Mystery Giant Caterpillars on Sidewalk Near Trees; Tomato Seedling Cold Tolerance and Fertilization Strategy; Tomato Fruit Set in Extreme Heat: Why Green Tomatoes Persist; What Is Bt (Bacillus thuringiensis) and How Does It Control Caterpillars?; Best Tomato Variety for Home Gardeners: 'Celebrity'; Tomato Leaf Problems: Overwatering, Nitrogen Excess, and Disease Diagnosis; Turnip Worms & Leaf‑Eating Bugs in Washington State; Organic Control of Tobacco Hornworms on Tomato Plants; Transplanting Mature Tomato Plants: Moving 'Better Boy' from South Carolina to Florida; Identifying Small Brown Worms in Pond Filters: Harmless or Harmful?

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