Bonide Thuricide Bt

Bonide Thuricide Bt is a liquid formulation of Bacillus thuringiensis bacteria, also known as Bt. Bt is a type of soil-borne bacteria that has been used since the 1950s for natural insect control. Bt produces proteins that are toxic when eaten by leaf-eating larval insects. These proteins are not toxic to humans, other mammals, fish, or birds. Because the toxic proteins must be eaten by larvae to be fatal, Bt doesn’t harm beneficial insects or earthworms. Bt can be used to control many leaf-eating worms like cabbage loopers, tomato hornworms, bagworms, cankerworms, gypsy moths, and tent caterpillars. It can safely be used on a wide variety of plants including almonds, apples, cherries, grapes, oranges, broccoli, cabbage, tomatoes, fruit and nut trees, shade trees, and ornamental plants like petunias.

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How to Use Pesticides Safely & Effectively
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How to Use & When to Apply:

This product is a concentrate. Shake bottle and dilute concentrate with water in a sprayer, adding concentrate to water in a jar or tank while shaking or stirring. Use up to 4 teaspoons of concentrate per gallon, depending on the crop and type of insect larvae targeted. Thoroughly spray all surfaces of affected plants. Use as soon as eggs or newly hatched larvae appear. Use diluted Bt within 12 hours to maintain usefulness. For increased effectiveness, use with Bonide Turbo Spreader Sticker to help distribution and adhesion of Bt.

It takes up to three days for Bt to kill caterpillars.This product can be reapplied weekly, or following heavy rains, as long as caterpillars persist. Thuricide Bt can be used on fruits and vegetables until the day of harvest. Wash harvested foods thoroughly. 

  • To control tomato hornworms, rindworm complex worms, omnivorous leaf rollers on tomato plants, eggplants, peppers, watermelons, or grapes, use 1 to 3 teaspoons of concentrate per gallon of water. To control grape leaf rollers, use 2 to 4 teaspoons.
  • For other fruit, berry, or vegetable plants, use 1 to 2 teaspoons of concentrate per gallon to control diamondback moths. Use 1 to 3 teaspoons to control imported cabbage worms or green cloverworms. Use 2 to 4 teaspoons to control cabbage loopers, roughskinned cutworms, and omnivorous leafrollers.
  • For citrus trees, use 1 to 2 teaspoons per gallon to control orange dog caterpillars. Use 2 to 4 teaspoons to control fruit tree leaf rollers or citrus cutworms. 
  • For other fruit and nut trees, use 2 to 4 teaspoons to control redbanded leafrollers, redhumped caterpillars, tent caterpillars, tufted apple budmoths, variegated leafrollers, fruit tree leafrollers, filbert leafrollers, omnivorous leafrollers, fall webworms, and gypsy moths. 
  • For shade trees and ornamental plants, use 4 teaspoons of concentrate per gallon to control bagworms, spring and fall cankerworms, tent caterpillars, elm spanworm, fall webworms, and gypsy moth caterpillars. For gypsy moth caterpillars, apply when caterpillars are small and repeat treatment after two weeks.

Pros to Using Bonide Thuricide Bt

  • Targets and kills all types of caterpillars
  • Lower environmental impact than other insecticides
  • The bacteria colonizes in leaves, but is harmless to plants

Cons to Using Bonide Thuricide Bt

  • Will not kill all insects, just leaf-eating larvae
  • Does not kill on contact and must be reapplied after rain
  • Takes a few days to start working

Available Sizes:

Bonide Thuricide Bt 16-ounce concentrate

The 16-ounce size is an economical choice for treating fruits, vegetables, and ornamentals. The concentrate lasts 3 to 5 years when stored in a cool, dry place, and only a small amount of concentrate is needed per application.


Helpful Link: How to Use Pesticides in Their Various Forms

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Hello and welcome! I'm Matt and I started Mid Atlantic Gardening to help gardeners in the Mid Atlantic (and beyond!) with their lawn and garden problems and issues.

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