---
product_id: 7426916
title: "Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions"
brand: "monterey"
price: "€ 43.87"
currency: EUR
in_stock: false
reviews_count: 8
url: https://www.desertcart.sk/products/7426916-monterey-b-t-biological-insecticide-for-organic-gardening-1-pint
store_origin: SK
region: Slovakia
---

# Safe for beneficial insects & plants Targets caterpillars & worms OMRI certified organic Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions

**Brand:** monterey
**Price:** € 43.87
**Availability:** ❌ Out of Stock

## Summary

> 🌱 Defend your garden organically — because your plants deserve the best!

## Quick Answers

- **What is this?** Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions by monterey
- **How much does it cost?** € 43.87 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/7426916-monterey-b-t-biological-insecticide-for-organic-gardening-1-pint)

## Best For

- monterey enthusiasts

## Why This Product

- Trusted monterey brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid Results:** Insects stop feeding immediately after contact, preserving your garden’s health and beauty.
- • **Effortless Application:** Instantly mixes with water and applies easily via sprayer for quick, targeted treatment.
- • **Precision Pest Control:** Effectively eliminates destructive caterpillars and worm pests without harming pollinators or birds.
- • **Versatile Plant Protection:** Use confidently on a wide range of vegetables, fruits, ornamentals, and shade trees.
- • **Organic Gardening Essential:** OMRI Listed and USDA compliant, perfect for eco-conscious gardeners who demand purity and safety.

## Overview

Monterey B.t. is a 1-pint concentrated biological insecticide designed to target caterpillars and worm-type pests while preserving beneficial insects like honeybees and ladybugs. OMRI Listed for organic gardening, it’s safe for a wide variety of plants including vegetables, fruits, and ornamentals. Easily mixed with water and applied via sprayer, it delivers fast-acting, eco-friendly pest control that supports sustainable, healthy gardens.

## Description

desertcart.com : Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions : Home Pest Repellents : Patio, Lawn & Garden

Review: Effective on western grapeleaf skeletonizers and horn worm caterpillars - Could not find this product locally despite a 3 year state-wide infestation of western grapeleaf (Harrisina metallica) skeletonizer caterpillars, the first destructive pest affecting Tecoma Stans including hybrids. The vitis arizonica grape was able to hold it's own but they destroying all new growth on my many Tecoma Stans and profoundly stunted them, the bushes actually got smaller each year than big-box purchase size because of the caterpillar damage. Western grapeleaf (Harrisina metallica) skeletonizers are colorul small yellowish-green fuzzy caterpillars that require gloves to prevent the spines from penetrating the skin like fine cactus spines. They skeletonize the leaves and cocoons are nearly impossible to get with spray insecticide because they curl the leaf around their cocoon. If the destroyed leaves aren't enough of a clue you need BT for effective treatment, the 1/2" shiny black moths that emerge can confirm. The base BT product is targeted to caterpillar/larva stages and is supposedly not harmful to birds, lizards, or pollinators, but additives can be harmful and this was reportedly a reliable safe product. I purchased a small 1 gallon sprayer to dedicate to this niche insecticide. BT was very effective and with one season of use, two applications over the summer about a month apart, the skeletonizer population came down to balance plant health and their part in the ecosystem. I did not notice any abnormal number of dead bees, may beetles, birds, or lizards, but I did discover that I had (very welcome) horn worm caterpillars that surprised me by migrating from my willows to my grape vines and Tecoma Stans when I sadly found their substantially sized dead bodies after the first BT spray application. A couple years later the skeletonizer population has largely lost their taste for my Tecoma Stans, and remains well managed with manual pruning of overladen grape leaves every few weeks during the summer.
Review: Most amazing product I have found - I grow much of our own food and try to do so as organically as possible. Earlier this year we were hit by a very nasty worm that was eating every single one of our broccoli and cauliflower plants. I was devastated. I had raised them from seed and to watch them being eaten a little more each day was tearing my heart straight out of my chest. A friend suggested I try this because she knew I don't use chemicals on my yard or in my garden. I have small grandchildren who like to visit and pull things straight off the bush or vine and eat them while we work in the garden together. I also have free range chickens and dogs and cats and bunnies who partake of goodies from our garden sometimes while it is still attached to the plant. I didn't want to risk the safety of those counting on me to keep them safe. So finding something that was human and pet friendly was difficult to say the least. I bought this thinking that it might work it might not but I was desperate for anything that might help. It not only helped it surpassed what I expected. I had used DE last year in our garden with a lot of success. DE kills anything with an exoskeleton pretty much and is used by our locals farmers as a micro wormer and duster for their lifestock. But caterpillars were a whole different animal all together. I mixed this with some neem oil concentrate I already had and sprayed my plants. My Broccoli, my cauliflower, my peppers, my tomatoes, my roses, and my berry bushes. It did far more than I ever would have thought possible. I have even sprayed it and the wind carried it back into the faces of my chickens with no ill effects. I am very impressed with this product and will be laying in a supply for future gardening use. I also learned that it treats the dreaded Japanese beetle in the larva stage. They burrow deep in the ground to lay their eggs and as they hatch the go towards the plants in your garden until the come out full grown and ready to consume anything in their path. I have treated my rose bushes which the beetles where feasting on with this product with the neem oil mixed in (this is a concentrate 1.5 ounces makes 3 gallons) along with dusting with my DE and my beetle problem is solved. I have to retreat after it rains because the rain washes it off the leaves but I am very happy with this product and the end result which is a pest free yard and safe environment for our my grandchildren and my pets. The woman who recommended this said she treated her tomatoes with it every year with great success. I have noticed my tomatoes are looking better than ever since I started using this product am not sure if it the organic nutrients in this product or the fact that are no longer attack from tomato worms but either way well worth the money spent. I give this product two thumbs up and I am a very picky consumer when it comes to my garden and the safety of my environment. A great organic choice well worth the money spent.

## Features

- INSECT KILLER - Designed for use on caterpillars and worm type insects, such as cabbage looper, bagworm, gypsy moth, fall cankerworm, elm spanworm, and more. Has no effect on birds, earthworms, or beneficial insects such as honeybees or ladybugs.
- FOLIAGE PROTECTOR - Designed for use on a variety of plants, including broccoli, celery, cabbage, turnip greens, mustard greens, cauliflower, melons, lettuce, tomatoes, shade trees, ornamentals, and many more.
- FOR ORGANIC GARDENING - OMRI Listed for Organic Gardening. Organic Material Review Institute reviews products to ensure a product complies with all organic standards under the USDA’s National Organic Program (NOP).
- EASY TO APPLY - Product instantly mixes with water and should be applied using either a trigger spray bottle or pressure tank sprayer. Carefully read and use according to label directions.
- QUICK ACTION - Insects eat treated foliage, then immediately stop feeding and damaging plants.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00ANT611U |
| Best Sellers Rank | #15,354 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #55 in Insect & Pest Repellent Spray Concentrates |
| Brand | Monterey |
| Customer Reviews | 4.6 4.6 out of 5 stars (7,272) |
| Department | All Ages |
| Global Trade Identification Number | 00022179103900 |
| Is Discontinued By Manufacturer | No |
| Item Form | Spray |
| Item Weight | 1 pounds |
| Item model number | LG6332 |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Sunlight Supply Inc. |
| Product Dimensions | 2 x 4 x 7 inches |
| Specification Met | USDA |
| Target Species | Insects |
| UPC | 022179103900 |

## Product Details

- **Brand:** Monterey
- **Item Form:** Spray
- **Item Weight:** 16 Ounces
- **Liquid Volume:** 16 Fluid Ounces
- **Specification Met:** USDA

## Images

![Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions - Image 1](https://m.media-amazon.com/images/I/414ajYRR7tL.jpg)
![Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions - Image 2](https://m.media-amazon.com/images/I/41DQfUXC+DL.jpg)
![Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions - Image 3](https://m.media-amazon.com/images/I/41HSo1nI-qL.jpg)
![Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions - Image 4](https://m.media-amazon.com/images/I/51SpU65j-kL.jpg)
![Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Pint Concentrate - Apply Using a Sprayer Following Mix Instructions - Image 5](https://m.media-amazon.com/images/I/51XF1z9+rzL.jpg)

## Questions & Answers

**Q: What is the shelf life of the undiluted product in the original container?**
A: My experience is that by the next year it is not very effective.  I would say shelf life is probably the season in which you purchase it.

**Q: How is this mixed and administered? Thanks.**
A: Most of the answers here are WRONG. According to the instructions on the label, mix 4 TEASPOONS BT with 1 GALLON WATER. That would be 1 1/3 TABLESPOONS BT (or 1 TABLESPOON plus 1 TEASPOON BT, since 1 tablespoon = 3 teaspoons). ALWAYS read instructions for products! Official product instructions go through multiple checks before being printed or published. No one proofreads these answers. Some of the responders here may be confusing tablespoons, teaspoons, and fluid ounces. (1 fluid ounce = 2 Tablespoons)  BT is considered safe, but it won't be effective at the wrong concentration. Other products might be very dangerous if mixed incorrectly.

**Q: Can this be injected into vine stems to kill the squash vine borer?**
A: Yes. At the very first signs of hole (usually evident by sawdust like droppings around the entry hole, inject BT above and below the openings to eliminate the borers.

**Q: can you apply with a end of hose sprayer? what dilution rate?**
A: There is a guide on the bottle for concentration. I believe it is about 1 ounce per gallon. Technically, you can use end of hose sprayer. I am always concerned about how far it will spray and how quickly 16 gallons of water will pass through. Our trees are very tall, so, I make a solution in a large container and use a power washer to get the extra height. Product works well. Caterpillars start dropping in minutes. This year, though, I tried sprinkling pesticide and letting it soak into roots of trees. It takes longer to work, but has been effective so far.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Effective on western grapeleaf skeletonizers and horn worm caterpillars
*by A***S on December 26, 2025*

Could not find this product locally despite a 3 year state-wide infestation of western grapeleaf (Harrisina metallica) skeletonizer caterpillars, the first destructive pest affecting Tecoma Stans including hybrids. The vitis arizonica grape was able to hold it's own but they destroying all new growth on my many Tecoma Stans and profoundly stunted them, the bushes actually got smaller each year than big-box purchase size because of the caterpillar damage. Western grapeleaf (Harrisina metallica) skeletonizers are colorul small yellowish-green fuzzy caterpillars that require gloves to prevent the spines from penetrating the skin like fine cactus spines. They skeletonize the leaves and cocoons are nearly impossible to get with spray insecticide because they curl the leaf around their cocoon. If the destroyed leaves aren't enough of a clue you need BT for effective treatment, the 1/2" shiny black moths that emerge can confirm. The base BT product is targeted to caterpillar/larva stages and is supposedly not harmful to birds, lizards, or pollinators, but additives can be harmful and this was reportedly a reliable safe product. I purchased a small 1 gallon sprayer to dedicate to this niche insecticide. BT was very effective and with one season of use, two applications over the summer about a month apart, the skeletonizer population came down to balance plant health and their part in the ecosystem. I did not notice any abnormal number of dead bees, may beetles, birds, or lizards, but I did discover that I had (very welcome) horn worm caterpillars that surprised me by migrating from my willows to my grape vines and Tecoma Stans when I sadly found their substantially sized dead bodies after the first BT spray application. A couple years later the skeletonizer population has largely lost their taste for my Tecoma Stans, and remains well managed with manual pruning of overladen grape leaves every few weeks during the summer.

### ⭐⭐⭐⭐⭐ Most amazing product I have found
*by J***S on June 18, 2013*

I grow much of our own food and try to do so as organically as possible. Earlier this year we were hit by a very nasty worm that was eating every single one of our broccoli and cauliflower plants. I was devastated. I had raised them from seed and to watch them being eaten a little more each day was tearing my heart straight out of my chest. A friend suggested I try this because she knew I don't use chemicals on my yard or in my garden. I have small grandchildren who like to visit and pull things straight off the bush or vine and eat them while we work in the garden together. I also have free range chickens and dogs and cats and bunnies who partake of goodies from our garden sometimes while it is still attached to the plant. I didn't want to risk the safety of those counting on me to keep them safe. So finding something that was human and pet friendly was difficult to say the least. I bought this thinking that it might work it might not but I was desperate for anything that might help. It not only helped it surpassed what I expected. I had used DE last year in our garden with a lot of success. DE kills anything with an exoskeleton pretty much and is used by our locals farmers as a micro wormer and duster for their lifestock. But caterpillars were a whole different animal all together. I mixed this with some neem oil concentrate I already had and sprayed my plants. My Broccoli, my cauliflower, my peppers, my tomatoes, my roses, and my berry bushes. It did far more than I ever would have thought possible. I have even sprayed it and the wind carried it back into the faces of my chickens with no ill effects. I am very impressed with this product and will be laying in a supply for future gardening use. I also learned that it treats the dreaded Japanese beetle in the larva stage. They burrow deep in the ground to lay their eggs and as they hatch the go towards the plants in your garden until the come out full grown and ready to consume anything in their path. I have treated my rose bushes which the beetles where feasting on with this product with the neem oil mixed in (this is a concentrate 1.5 ounces makes 3 gallons) along with dusting with my DE and my beetle problem is solved. I have to retreat after it rains because the rain washes it off the leaves but I am very happy with this product and the end result which is a pest free yard and safe environment for our my grandchildren and my pets. The woman who recommended this said she treated her tomatoes with it every year with great success. I have noticed my tomatoes are looking better than ever since I started using this product am not sure if it the organic nutrients in this product or the fact that are no longer attack from tomato worms but either way well worth the money spent. I give this product two thumbs up and I am a very picky consumer when it comes to my garden and the safety of my environment. A great organic choice well worth the money spent.

### ⭐⭐⭐⭐⭐ Works great !!
*by A***R on December 9, 2025*

Took care of the worms wonderfully but I did not learn about this product until late in the season. Next year, the worms are in so much trouble 🫨

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---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-02-08*