Monterey Ready to Use B.t.
Best organic solution for gardeners managing caterpillar and worm infestations.
Protect your garden naturally with Monterey Ready to Use B.t. This powerful, ready-to-use spray harnesses the natural bacterium Bacillus thuringiensis (Bt) to effectively target and eliminate worms and caterpillars. It's a safe and eco-friendly choice, protecting your vegetables without harmful chemical residues. Apply when pests are young for best results, and enjoy peace of mind knowing it's safe for beneficial insects, birds, and earthworms. You can even use it right up to harvest day, ensuring your produce is safe to eat.
$16.99
Owner Satisfaction
4.6
/ 5
Category Rank
305
/ 1717
#305 in Pesticides
Price vs Category Average
-62%
Below average
Formulation
Ready to Use
/ Ready to Use
Who it's for
- Gardeners protecting beneficial pollinators and ladybugs
- Organic growers harvesting edible crops frequently
- Busy gardeners needing fast, mess-free spot treatments
Who should skip it
- Gardeners unable to commit to thorough, direct foliage coverage
- Gardeners battling aphids, mites, or adult beetles
- People seeking a low-maintenance, set-it-and-forget-it pest solution
Performance breakdown
Target Specificity
Highly selective formula spares beneficial pollinators and garden wildlife.
Application Convenience
Ready-to-use spray format eliminates mixing and measuring hassles.
Harvest Safety
Zero-day pre-harvest interval allows for worry-free vegetable consumption.
Pest Control Speed
Stops caterpillar feeding damage almost immediately upon ingestion.
Environmental Impact
Biological active agent breaks down naturally without leaving chemical residues.
Treatment Versatility
Specialized for caterpillars, but ineffective against broader garden pest infestations.
Key Specs
Formulation
Ready to Use
Active Agent
Bacillus thuringiensis (Bt)
Container Size
1 Quart
Pest Target
Worms and Caterpillars
Application Method
Spray foliage
Pre-Harvest Interval (PHI)
Up to the day of harvest
Features
- Targets worms and caterpillars effectively.
- Uses natural biological control (Bt).
- Safe for beneficial insects and birds.
- Ready-to-use liquid spray formula.
- Safe for edible plants up to harvest.
- Pests stop feeding immediately.
- Non-toxic garden pest solution.
- Eco-friendly alternative to chemicals.
What customers say
Gardeners consistently praise Monterey B.t. for its reliable effectiveness, noting rapid control of destructive caterpillars like loopers and hornworms. The ready to use formulation is a major highlight, eliminating mixing hassles and ensuring immediate application. Consumers appreciate that this powerful solution is also safe for pollinators and pets, offering peace of mind. This combination of targeted results and simple convenience drives high satisfaction, making it a trusted staple for organic pest management.
Know before you buy
This product is specifically formulated to target caterpillars and worm-like larvae, such as tomato hornworms, cabbage loopers, and bagworms. It is not designed to control aphids, beetles, or other non-caterpillar garden pests.
Yes. Because it uses a natural bacterium rather than synthetic chemicals, it is safe for use on edible plants. You can apply it to your vegetables right up until the day of harvest.
No, Monterey B.t. is selective. It is safe for beneficial insects like bees and ladybugs, as well as birds and earthworms, because it only affects specific caterpillars that ingest the treated foliage.
While the pests may not die immediately, they will stop feeding on your plants almost instantly after ingesting the treated leaves. They typically perish within a few days.
No, this is a ready-to-use formula. It comes in a spray bottle, so you can apply it directly to the foliage of your plants without any additional preparation.
For the best results, apply the spray when the pests are young and actively feeding. Since the product must be ingested to work, ensure you thoroughly coat the leaves where the caterpillars are present.
Still have a question?
Ask Hayley anything about this product before you decide.
Ready to buy?
$17