10 Best bt sprays of 2026

Explore top picks

Best Choice

1

Bonide
Bonide Captain Jack's Thuricide BT, 128 oz Ready-to-Use with Sprayer, Kills Worms and Caterpillars in Home Garden, For Organic Gardening
Main highlights

Key Features
Fast-acting, organic spray controls harmful insects within 2-3 days without harming beneficial ones. Safe for edible plants up to harvest day.

Ideal Use Cases
Perfect for gardeners battling cabbage loopers, hornworms, and tent caterpillars on fruits, vegetables, trees, and ornamentals.

Customer Reviews Highlight
Users praise its effectiveness in organic gardening and its ease of use with the ready-to-use trigger sprayer.
9.8

Exceptional

Our Rating

8.7
Simple to use

8.0
worth the money

8.0
Aroma
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Value for Money

2

Monterey

Monterey BT - Ready to Spray Bacillus Thuringiensis for Organic Worm and Caterpillar Control - 31oz
9.7

Exceptional

Our Rating
3

Bonide
Bonide 8066 Captain Jack's Bacillus Thuringiensis BT Organic Worm & Caterpillar Control, 32 oz. Ready-to-Us - Quantity 1
Main highlights

Key Features and Benefits
Controls various worms and caterpillars on fruits and vegetables, safe for beneficial insects, and approved for organic gardening.

Ideal Use Cases
Perfect for broccoli, tomatoes, and ornamentals when first signs of caterpillars or worms appear, ensuring a bountiful, damage-free harvest.

Customer Praise
Highly praised for its effectiveness, ease of use with the ready-to-use sprayer, and environmental safety, particularly around beneficial insects.
9.6

Exceptional

Our Rating

9.5
Simple to use

8.7
worth the money

8.0
Aroma
4

Southern Ag

Southern Ag Thuricide BT Caterpillar Control, 16oz - Pint
9.4

Excellent

Our Rating

9.7
Simple to use

9.3
worth the money

8.4
Aroma
5

Bonide
Bonide Thuricide BT Concentrate, 16 oz Ready-to-Mix Solution for Caterpillar, Worm and Moth Control in Home Garden
Main highlights

Key Features
Eco-friendly insecticide for fruits, vegetables, and ornamentals. Kills worms and caterpillars without harming beneficial insects, approved for organic gardening.

Ideal Use Cases
Best for cabbage, broccoli, kale, tomatoes, and more. Perfect for controlling cabbage loopers, hornworms, and tent caterpillars on edible and ornamental plants.

Customer Praise
Highly praised for its effectiveness in stopping worm damage quickly, with noticeable results in 2-3 days, and for being safe around beneficial insects.
Key specs
- duration:2-3 days
- target species:Worms, caterpillars
- active ingredients:Bacillus thuringiensis
- formulation:Concentrate
- scent:N/A
9.3

Excellent

Our Rating

9.1
Simple to use

8.9
worth the money

8.0
Aroma
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6

Monterey

Monterey B.t. Bundled with Measuring Spoon - Caterpillar & Worm Killer Organic Gardening - Apply with Sprayer - 8 oz
9.2

Excellent

Our Rating
7

Monterey

Monterey B.t. Bundled with Measuring Spoon - Caterpillar & Worm Killer Organic Gardening - Apply with Sprayer - 32 oz
8.9

Very Good

Our Rating
8

Monterey

Monterey BT - Bacillus Thuringiensis for Organic Worm and Caterpillar Control Bundled with Measuring Spoon - Concentrate for BT Spray - 16 oz
8.8

Very Good

Our Rating
9

Monterey

Monterey - B.t. Bacillus Thuringiensis Bundled with Garden Measuring Spoon - Ready to Spray Worm & Caterpillar Killer Insecticide, OMRI Listed - 32 oz
8.7

Very Good

Our Rating
10

Monterey
Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Quart Concentrate - Apply Using a Sprayer Following Mix Instructions
Main highlights

Key Features
Targets caterpillars and worms, safe for bees/earthworms, OMRI Listed for organic gardening, easy water mix application.

Ideal Use Cases
Perfect for protecting vegetables like broccoli and tomatoes, and ornamentals from damaging worms without harming beneficial insects.

Customer Praise
Most reviews highlight its effectiveness against a variety of pests while being safe for the garden ecosystem and beneficial insects.
8.6

Very Good

Our Rating

9.9
lasts a long time

9.9
Easy to use

9.7
Simple to use

10 Best bt sprays of 2026

1

Bonide Captain Jack's Thuricide BT, 128 oz Ready-to-Use with Sprayer, Kills Worms and Caterpillars in Home Garden, For Organic Gardening

8.7

8.0

8.0

How do we rank?

How do we rank?

Analyzing top stores

2

Monterey BT - Ready to Spray Bacillus Thuringiensis for Organic Worm and Caterpillar Control - 31oz

3

Bonide 8066 Captain Jack's Bacillus Thuringiensis BT Organic Worm & Caterpillar Control, 32 oz. Ready-to-Us - Quantity 1

9.5

8.7

8.0

4

Southern Ag Thuricide BT Caterpillar Control, 16oz - Pint

9.7

9.3

8.4

5

Bonide Thuricide BT Concentrate, 16 oz Ready-to-Mix Solution for Caterpillar, Worm and Moth Control in Home Garden

9.1

8.9

8.0

6

Monterey B.t. Bundled with Measuring Spoon - Caterpillar & Worm Killer Organic Gardening - Apply with Sprayer - 8 oz

7

Monterey B.t. Bundled with Measuring Spoon - Caterpillar & Worm Killer Organic Gardening - Apply with Sprayer - 32 oz

8

Monterey BT - Bacillus Thuringiensis for Organic Worm and Caterpillar Control Bundled with Measuring Spoon - Concentrate for BT Spray - 16 oz

9

Monterey - B.t. Bacillus Thuringiensis Bundled with Garden Measuring Spoon - Ready to Spray Worm & Caterpillar Killer Insecticide, OMRI Listed - 32 oz

10

Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Quart Concentrate - Apply Using a Sprayer Following Mix Instructions

9.9

9.9

9.7

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