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Tomato Hornworm Frass: A Sign to Start Bt Sprays

Droppings on tomato leaves mean a hornworm is feeding. They're voracious and well-camouflaged. Natural enemies: braconid wasps (white cocoons on caterpillar) and paper wasps. Preventively spray Bt (Bacillus thuringiensis) weekly from early May.

About Gardening: Tomato Hornworm in Wilmington, NC: Identification and Control; Identifying Mysterious Droppings in Stored Clothing; Tomato Seeds Do Not Need Freezing: Simple Germination; Growing Tomatoes from Store-Bought Fruit: Hybrid vs. Heirloom; Growing Tomatoes: America's Favorite Garden Vegetable; Pruning Indeterminate Tomatoes: Pinching for Manageable Height and Better Fruit Protection; Identifying Heirloom Tomato Varieties; Tomato Fruitworm: Also Eats Leaves; Tomato Hornworm Parasitized by Braconid Wasps: Nature's Pest Control; Why Tomato Flowers Drop and Fruit Looks Deformed: Pollination Solutions

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