---
product_id: 4355848
title: "Brand Caterpillar Killer II Concentrate Spray, 16 fl oz | Kills Caterpillars, Gypsy Moth Larvae, Worms & Cabbage Loopers, Organic Pest Control Spray, Outdoor Use in Plants & Gardens"
brand: "safer"
price: "$51.61"
currency: USD
in_stock: true
reviews_count: 8
category: "Safer"
url: https://www.desertcart.us/products/4355848-brand-caterpillar-killer-ii-concentrate-spray-16-fl-oz-kills
store_origin: US
region: United States of America
---

# Safe to use until harvest OMRI organic certified 98.35% Bt active toxin Brand Caterpillar Killer II Concentrate Spray, 16 fl oz | Kills Caterpillars, Gypsy Moth Larvae, Worms & Cabbage Loopers, Organic Pest Control Spray, Outdoor Use in Plants & Gardens

**Brand:** safer
**Price:** $51.61
**Availability:** ✅ In Stock

## Summary

> 🌱 Defend your garden like a pro—pests don’t stand a chance!

## Quick Answers

- **What is this?** Brand Caterpillar Killer II Concentrate Spray, 16 fl oz | Kills Caterpillars, Gypsy Moth Larvae, Worms & Cabbage Loopers, Organic Pest Control Spray, Outdoor Use in Plants & Gardens by safer
- **How much does it cost?** $51.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/4355848-brand-caterpillar-killer-ii-concentrate-spray-16-fl-oz-kills)

## Best For

- safer enthusiasts

## Why This Product

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

## Key Features

- • **Rapid Action:** Stops pest feeding immediately for fast garden recovery
- • **Eco-Friendly Formula:** Protects beneficial insects and the environment while eliminating pests
- • **Harvest-Ready Safety:** Use confidently up to the day of harvest without residue worries
- • **Precision Pest Control:** Targets caterpillars, moth larvae & worms with surgical accuracy
- • **Trusted Organic Compliance:** OMRI listed for certified organic gardening peace of mind

## Overview

Safer Brand Caterpillar Killer II Concentrate is a powerful, 16 fl oz organic pesticide featuring 98.35% Bacillus Thuringiensis var. Kurstaki. It effectively eliminates caterpillars, gypsy moth larvae, worms, and tomato hornworms without harming beneficial insects or the environment. OMRI listed and safe for use up to harvest day, it offers rapid pest control for thriving, healthy gardens.

## Description

Safer Brand 16 oz. Caterpillar Killer II Concentrate kills worms and caterpillar stage insects but has no effect on birds, earthworms, or beneficial insects when used as directed. The caterpillars and worms that are damaging your plants will stop feeding immediately after ingesting, which is known scientifically as Bacillus Thuringiensis var. Kurstaki (B.t. for short).Use in late afternoon or on cloudy days since the BT breaks down in sunlight. Controls tent caterpillars, gypsy moths, cabbage loopers, tomato horn worms and more. Safer Brand Caterpillar Killer is OMRI Listed and can be used up until the day of harvest.

Review: This product really works! - This product really works! Tobacco Budworms were eating all my petunias and after spraying with this solution twice, within 5 days I had full blossoms returning and no signs of any further damage.
Review: Seems to work! - Squash vine borers ate up all but two of my squash. I tried injecting this directly in the stems, and to my surprise it seems to have worked on my last two plants, fingers crossed.

## Features

- Kills caterpillars, gypsy moth larvae, worms and cabbage loopers
- Effective method of eliminating your garden or field of the tomato hornworm without environmental concerns or harm to beneficial insects
- Can be used up until day of harvest
- OMRI Listed and compliant for use in organic gardening
- Contains bacillus thuringiensis var Kurstaki 98.35 percent

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00GVKZG8E |
| Active Ingredients | Bacillus Thuringiensis subspecies Kurstaki strain SA-12 solids, spores, and Lepidopteran active toxins 98.35%, Other Ingredients 1.65% Active Ingredients Bacillus Thuringiensis subspecies Kurstaki strain SA-12 solids, spores, and Lepidopteran active toxins 98.35%, Other Ingredients 1.65% See more |
| Best Sellers Rank | #2,919 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #23 in Insect & Pest Repellent Spray Concentrates |
| Brand | Safer |
| Brand Name | Safer |
| Customer Reviews | 4.5 out of 5 stars 3,116 Reviews |
| Global Trade Identification Number | 00024654516304 |
| Included Components | Safer Caterpillar Killer Multiple Insects 16 Oz |
| Item Form | Liquid |
| Item Type Name | Safer Brand 5163 Caterpillar Killer II Concentrate, 16 oz |
| Item Weight | 1 pounds |
| Liquid Volume | 16 fluid ounces |
| Manufacturer | Safer |
| Model Number | 5163-6 |
| Part Number | 5163-6 |
| Target Species | Insects |
| UPC | 024654516304 |
| Unit Count | 16 Fluid Ounces |
| Warranty Description | Warranty |

## Product Details

- **Brand:** Safer
- **Item Form:** Liquid
- **Item Weight:** 1 Pounds
- **Liquid Volume:** 16 Fluid Ounces

## Images

![Brand Caterpillar Killer II Concentrate Spray, 16 fl oz | Kills Caterpillars, Gypsy Moth Larvae, Worms & Cabbage Loopers, Organic Pest Control Spray, Outdoor Use in Plants & Gardens - Image 1](https://m.media-amazon.com/images/I/81OGpyaqiRL.jpg)

## Questions & Answers

**Q: How well does this work on fungus gnats?  I have to water every day and the yellow sticky flags can't keep up.  Thank you**
A: There are different subspecies of Bacillus thuringiensis, and they each kill different things. Bt is very specific. This product contains Btk, which is Bacillus thuringiensis var. kurstaki. It kills caterpillars, i.e., the larvae of butterflies and moths. It won't kill fungus gnats. You want Bti, Bacillus thuringiensis var israelensis. Bti kills the maggots of a certain subfamily of flies that includes mosquitoes, black flies, and fungus gnats. Some products that contain Bti are Gnatrol, which is a powder, and Mosquito Dunks/Mosquito Bits, which come carried on chunks of stuff made of corn. The specificity of Bt is what makes it excellent for people who have concerns about the environment and don't want to kill bees, worms, and other beneficial creatures, but it also limits its use. You can't spray it and expect it to kill all the bugs it makes contact with the way that many synthetic chemical pesticides do. You need to know what you want to kill and get the right formula for it.

**Q: Will this product harm our medicinal herbs? I don't want to spray if all of my flowers will die..we'd rather be stuck plucking the little %$&#ers....**
A: The description here on Amazon says it’s safe..  But the directions on the bottle say it’s poison.  It says harmful to people and animals, and to wash hands thoroughly after any contact.  Now I’m wondering is I can spray my tomatoes.

**Q: How long will a bottle last and retain it's effect last if stored correctly?**
A: This bottle of BT is a concentrate, so you'll need to mix the appropriate amount from the bottle in another sprayer-type applicator (the amount of BT to use depends on the capacity of your sprayer).  During the active growing period, the label recommends application once per week or after rain for best caterpillar control.  I personally have used this product before, and it lasted a long time when capped and stored out of extreme heat/cold.  The amount you'll use will depend also on the size of your garden.  This stuff will keep the common cabbage loopers and tomato hornworms OUT of your produce, along with other common lepidoptera larvae.

**Q: How much per gallon?**
A: We recommend mixing 1 tablespoon of concentrate per gallon of water.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This product really works!
*by J***1 on July 15, 2026*

This product really works! Tobacco Budworms were eating all my petunias and after spraying with this solution twice, within 5 days I had full blossoms returning and no signs of any further damage.

### ⭐⭐⭐⭐⭐ Seems to work!
*by A***S on July 20, 2026*

Squash vine borers ate up all but two of my squash. I tried injecting this directly in the stems, and to my surprise it seems to have worked on my last two plants, fingers crossed.

### ⭐⭐⭐⭐ Great for protecting fruit trees
*by L***M on June 12, 2017*

If you want an organic way to prevent caterpillars from eating leaves on your trees, especially fruit trees & ornamentals, this is a great way to go. Totally organic bacterial prevention that makes the caterpillars ill when they start to eat. I can spray this all over my weeping cherry tree, peach tree, and any oak & maple branches I can reach with my hand pump sprayer, and the tent caterpillars & inchworms that have plagued those trees for the past couple years are very effectively eliminated. The only drawback is that it must be reapplied about weekly or after heavy rains. As long as you're only dealing with a few trees, this is manageable. And it's really nice to spray this without worrying about the kids & pets & beneficial insects & birds getting harmed. I've tried non-organic stuff in the past and it absolutely kills the caterpillars more quickly and often with a single application, but I like that I can use the BT and still let the kids & pets walk around the yard without worry. I'm using it in a 2-gallon hand-pump sprayer and have applied it once every 1-2 weeks and can say it has very effectively prevented caterpillars from damaging my trees, while neighboring trees have leaves that look like swiss cheese.

## Frequently Bought Together

- Safer Brand 5163 Caterpillar Killer II Concentrate, 16 Oz For Insects
- Chapin 20000 Made in USA 1 -Gallon Lawn and Garden Pump Pressured Sprayer, for Spraying Plants, Garden Watering, Weeds and Pests, Polypropylene, Translucent White
- Safer 5118-6 Insect Killing Soap Concentrate - Insecticidal Soap for Plants - Kills Aphids, Whiteflies, Thrips, Spider Mites, and More - OMRI Listed for Organic Use

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-08-06*