Monterey B.t. Caterpillar Killer Concentrate is an OMRI Listed® biological insecticide designed to control destructive caterpillars and worm pests naturally without harming beneficial insects, pollinators, birds, or earthworms. Powered by Bacillus thuringiensis (Bt), a naturally occurring soil bacterium, this highly effective organic caterpillar treatment targets the digestive systems of feeding larvae to stop damage quickly and efficiently.
Ideal for organic gardening, Monterey B.t. is trusted by home gardeners and growers to protect vegetables, fruiting plants, ornamentals, shrubs, flowers, and trees from leaf-chewing pests. Once ingested, caterpillars stop feeding and die shortly afterward, helping prevent severe crop and foliage damage while preserving beneficial garden insects.
This versatile concentrate can be safely applied to edible crops up to the day of harvest, making it an excellent choice for organic vegetable gardens, fruit gardens, and integrated pest management programs.
Key Features & Benefits
- OMRI Listed® for organic gardening
-
Biological insecticide powered by Bacillus thuringiensis (Bt)
- Targets destructive caterpillars and worm pests
- Safe for beneficial insects, pollinators, birds, and earthworms
- Can be used on vegetables, fruits, ornamentals, trees, and shrubs
- Safe to apply up to the day of harvest
- Easy-to-mix concentrate for flexible application
- Ideal for organic gardens and integrated pest management
Controls Common Garden Pests Including
- Tomato hornworms
- Cabbage loopers
- Tent caterpillars
- Bagworms
- Gypsy moth caterpillars
- Leaf-feeding worms and larvae
Great For Use On
- Tomatoes and vegetables
- Broccoli and leafy greens
- Melons and vine crops
- Fruit plants and edible gardens
- Shade trees and shrubs
- Flowers and ornamentals
How to Apply
Mix 1.5–2 fluid ounces of concentrate per 3 gallons of water to treat approximately 1,000 square feet. Thoroughly spray all foliage, including both the tops and undersides of leaves, where caterpillars actively feed.
For best results, apply during the late afternoon or early evening to reduce direct sunlight exposure and maximize feeding activity. Reapply every 5–7 days while pests are active or after heavy rainfall.
Always read and follow label directions before use. Keep out of reach of children.
