---
product_id: 26840963
title: "Monterey B.t."
brand: "monterey"
price: "$89.83"
currency: USD
in_stock: null
reviews_count: 5
url: https://www.desertcart.us/products/26840963-monterey-b-t
store_origin: US
region: United States of America
---

# Safe for beneficial insects & earthworms Targets caterpillars & worms OMRI certified organic Monterey B.t.

**Brand:** monterey
**Price:** $89.83
**Availability:** ❌ Out of Stock

## Summary

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

## Quick Answers

- **What is this?** Monterey B.t. by monterey
- **How much does it cost?** $89.83 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/26840963-monterey-b-t)

## 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

- • **Organic Certified:** OMRI Listed and USDA compliant, ensuring your garden stays 100% organic and chemical-free.
- • **Eco-Friendly Formula:** Protects your garden’s ecosystem by sparing bees, birds, and earthworms—because balance matters.
- • **Effortless Application:** Concentrated formula mixes instantly with water for easy spray application, saving you time and hassle.
- • **Precision Pest Control:** Specialized action against destructive caterpillars like cabbage looper & gypsy moths for healthier plants.
- • **Versatile Plant Protection:** Effective on a wide range of edibles and ornamentals—from tomatoes to shade trees—keeping your entire garden thriving.

## Overview

Monterey B.t. is a 1-quart concentrated biological insecticide formulated with Bacillus thuringiensis, targeting caterpillar and worm pests while being safe for beneficial insects and earthworms. OMRI listed for organic gardening, it protects a wide variety of plants and is easy to apply via sprayer, making it a trusted choice for eco-conscious gardeners seeking effective, chemical-free pest control.

## Description

desertcart.com : Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Quart Concentrate - Apply Using a Sprayer Following Mix Instructions : 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 - This pest control is designed for use on caterpillars and worm type insects, such as cabbage looper, bagworm, gypsy moth, fall cankerworm, elm spanworm and many more.
- FOLIAGE PROTECTOR - This insecticide is 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.
- SAFE FOR EARTHWORMS & BEES - When used as directed, Monterey B.t. has no effect on birds, earthworms, or beneficial insects such as honeybees or ladybugs.
- 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00FGIGKXW |
| Active Ingredients | Bacillus thuringiensis |
| Best Sellers Rank | #5,896 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #28 in Insect & Pest Repellent Spray Concentrates |
| Brand Name | Monterey |
| Customer Reviews | 4.6 4.6 out of 5 stars (6,975) |
| Global Trade Identification Number | 00022179103917 |
| Included Components | Label Mix Instructions |
| Item Form | Spray |
| Item Type Name | Insecticide/Pesticide Treatment Concentrate |
| Item Weight | 32 Ounces |
| Liquid Volume | 32 Fluid Ounces |
| Manufacturer | Monterey |
| Model Number | LG 6336 |
| Part Number | LG 6336 |
| Specification Met | USDA |
| Target Species | Insects |
| UPC | 022179103917 |
| Unit Count | 32.0 Fluid Ounces |

## Product Details

- **Active Ingredients:** Bacillus thuringiensis
- **Brand:** Monterey
- **Item Form:** Spray
- **Item Weight:** 32 Ounces
- **Liquid Volume:** 32 Fluid Ounces

## Images

![Monterey B.t. - Image 1](https://m.media-amazon.com/images/I/71W4Gl14J6L.jpg)

## Available Options

This product comes in different **Size, Style** options.

## 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.

### ⭐⭐⭐⭐⭐ Safe mosquito killer
*by M***A on October 3, 2025*

If you hate mosquitos...then look no further. This product is great at controlling mosquito larva in bodies of water. Good value, lasts a long time if kept cool, and does its job. It is totally safe for pets too. I've been using BT for many years and it works great...just use it before the mosquitos beat you to the water. Highly recommeded for those that don't like harmful chemicles and deet. Thanks so much for offering this product on Amazon!!

## Frequently Bought Together

- Monterey B.t. - Biological Insecticide for Organic Gardening - 1 Quart Concentrate - Apply Using a Sprayer Following Mix Instructions
- Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White
- Neem Bliss (16 Fl Oz) - Pure Neem Oil Concentrate - 100% Cold Pressed Neem Oil - All-Natural Neem Oil Concentrate - Pure Neem Oil Extract - Unrefined Neem Oil for Hair - Neem Seed Oil Concentrate

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.us/products/26840963-monterey-b-t](https://www.desertcart.us/products/26840963-monterey-b-t)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-31*