Safer® Brand Caterpillar Killer Concentrate 1gal

Model #: 5160GAL

6 reviews
0 5 4.9

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  • Kills caterpillars, gypsy moth larvae, worms, and more.
  • Contains B.t. Kurstaki (bacillus thuringiensis).
  • Makes up to 768 gallons of solution.
  • For use on trees, shrubs and vegetables.
  • Caterpillars die within days of ingesting this product.
Cannot Ship To: HI

Safer® Brand Caterpillar Killer, 1 gallon concentrate

Safer® Brand Caterpillar Killer Concentrate eliminates caterpillars and worms, including tent caterpillars, gypsy moth larvae, budworms, bagworms, cabbage loopers, tomato hornworms, webworms and many more.

This b.t. formula provides you with enough product to treat a row planting, making it ideal for large applications.

Safer® Brand Caterpillar Killer uses bacillius thuringiensis var. Kurstaki which, once ingested by the caterpillar or worm, kills them within a few days. Simply mix this concentrate with water and spray on infested plants to eliminate leaf-feeding caterpillars and worms. Safer® Brand Caterpillar Killer can be used up to the day of harvest.

It is recommended to apply in the afternoon or on cloudy days since b.t. breaks down rapidly in sunlight.

Directions for Use:

  1. Thoroughly mix 1 to 2 teaspoons of concentrate per 1 gallon of water. For high populations and larger larvae, use up to 4 teaspoons per gallon of water. (Specific recommended amounts of Caterpillar Killer found in full instructions)
  2. Spray infested plants to provide a thorough coverage of foliage.
  3. Treat when larvae are young before extensive feeding damage has occurred.
  4. Repeat application at 3 to 14 day intervals as needed up to the day of harvest.
  5. Store in tightly closed container between 20°F to 90°F.

Safer® Brand leads the alternative lawn and garden products industry, offering many solutions that are compliant with organic gardening standards. Safer® Brand recognizes this growing demand by consumers and offers a wide variety of products for lawns, gardens, landscapes, flowers, houseplants, insects and more!


Safer® Brand Caterpillar Killer - Specs

Product Features:

  • Kills caterpillars, gypsy moth larvae, cabbage loopers, and more
  • Contains b.T. (bacillus thuringiensis var. Kurstaki)
  • Can be used up to the day of harvest
  • For use on trees, shrubs and vegetables

What's in the Box:

  • 1 gallon (128oz) concentrate


  • Makes up to 768 gallons of solution

Note: Do NOT store mixed solution. Only mix amount that will be used fully at each application or dispose of mixed solution that is remaining. Mixed solution will not be stable over time in storage.


Disclaimer: Safer® Brand does not endorse any information contained in product reviews. Please follow all label instructions for your specific use.

Most Recent Customer Reviews

Review Rate
Review posted on
March 28, 2014
Amazon Review By
put Bt in your watering can to kill gnats thriving in the soil. It does not damage houseplants or garden plants. I've been using it for gnat control for over a decade. Safer is my favorite brand, but I wish it came in larger bottles.
Review Rate
Review posted on
December 8, 2013
Amazon Review, works like a champ! By
this stuff is great for caterpillars eating your harvest. i had zero budrot damage from caterpillars this year thanks to this stuff!
Review Rate
Review posted on
November 20, 2013
Amazon Review By
This seems to be doing the job of the late fall worm attack on our greens. I have had to use it only twice. Don't let the small size of the bottle fool you as it takes so little per qt. Will also use this during the heat of summer to get those nasty horn worms!
Review Rate
Review posted on
September 2, 2013
Amazon Review By
The bottle is very small and you will need to have a spray bottle in which to pour this concentrate, but so far, it has worked!
Review Rate
Review posted on
June 28, 2011
Review Posted on By
I've had a huge problem with cabbage worms and other caterpillars destroying my herbs. While traditional chemical pesticides worked fairly well, I never felt all that comfortable eating my herbs after spraying them with those chemicals. When I read about BT (Bacillus thuringiensis), I thought it sounded too good to be true...a bacterium that kills caterpillars but is absolutely harmless to humans, pets, and bees. I'm so glad I tried Safer® Brand Caterpillar Killer with BT! I sprayed my sad, moth-eaten herbs with BT a couple times a week for 2 to 3 weeks and I'm happy to say that there are no signs of caterpillars and my plants have really come back to life! The spray smells awful but the smell dissipates quickly and it works so I don't really care about the transient odor. I definitely recommend this product!
Review Rate
Review posted on
May 21, 2011
Review Posted on By
I've used various Safer products for over a decade, generally with success, and this product is one of my favorites.I like this spray because BT (bacillus thuringiensis) works. It kills caterpillars and doesn't wreak havoc on the environment. This is because the active mechanism -- the bacillus -- is found naturally in the great outdoors, and Safer only concentrates it.The way it works is that caterpillars eat the bacillus, and this causes them to lose their appetite. Within a day or so they die. I've always begun spraying a day or so before I expected my usual outbreaks of, let's say, tomato hornworms. My plan was to be ready to 'poison' the small guys so that they'd never get to be the destructive big guys. Worked exceedingly well.THE SKINNY:::Safer® Brand Caterpillar spray works great. It acts to stop the caterpillars from feeding and it doesn't harm beneficials, like bees!Though safer than most gardening products, do READ the instructions.One of the things you want to consider is that Bt breaks down in sunlight. I therefore, always shook or sprayed in the evenings. (I think the caterpillars are night owls.)Do give this a try.
Read All Reviews (6) Write a Review
Q.How long is the application good for and does the residue wash off with fog?

We recommend reapplying this spray every 5-7 days as new eggs may hatch. This product will breakdown in excessive sunlight so it is best applied int he afternoon or in cloudy days.

This effects of this product has not been tested with fog.

Q.When stored properly, how long does this product last? Does the concentrate (not mixed solution) expire?

When stored in relatively cool temperatures, out of direct sunlight, the bottle of concentrate can last several years.

Q.Can I put Safer Caterpillar killer concentrate in the ground to kill termite larvae in their nest? And if so what is the ratio of water to concentrate?

This product is not recommended for use as a soil drench or to kill termite larvae.

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All About

All About Caterpillars in Your Garden

By learning about the many caterpillars that inhabit your vegetable & fruit gardens, you will find methods of controlling them so you can have a bountiful harvest.

Learn More About These Caterpillars:

Control Options

Control Options for Caterpillars in Your Garden


B.t. and pyrethrins are chemicals that can be used to help control the tomato hornworm, cabbage loopers and cabbageworms. B.t. (Bacillus thuringiensis) eliminates your garden or field of tomato hornworm and other leaf feeding caterpillars.

Insecticides containing pyrethrins can also be an effective method of controlling these caterpillars.


B.t. kills hornworm larvae, cabbage loopers and cabbageworms thereby preventing further damage. When the worm ingests the B.t., it works as a gut rot poison that makes the worm stop feeding. The tomato hornworm, cabbage looper or cabbageworm will stop feeding immediately and die within days of malnutrition.

B.t. usually comes in a dust or concentrate and kills a variety of caterpillars and worms.

Sprays with pyrethrins paralyze the insects and result in their death.


It is recommended with any pesticide to test plants for sensitivity to the product. Spray a small section of the plant in an inconspicuous area and wait 24 hours before full coverage.


B.t. is generally applied when it is a cooler time of day, preferably later in the afternoon or early in the evening since the product breaks down in sunlight and heat. Carefully read and follow all directions on the product's label.

When applying pyrethrins to infected plants, carefully read and follow all directions on the product labeling for safe and effective application. Do not spray plants in the peak of the day or when temperatures exceed 90°F


Worm & Caterpillar Predators


Tomato Hornworms

The parasitic wasp and green lacewings are two beneficial insects that help to control tomato hornworm problems. They can be attracted naturally to your cornfield or garden area where your corn is planted, and there are some companies that breed these insects and sell them to consumers.

Cabbage Loopers

Predators of the cabbage looper include lady beetles, spiders, pirate bugs, wasps, birds and small mammals.


A natural control method would be to entice parasitic wasps to your garden so these beneficial pests can help control the cabbageworm.


Tomato Hornworm

The parasitic wasp lays its eggs inside the tomato hornworm's egg. These have shown success rates of over 50% and higher. Upon hatching, the green lacewing larvae will eat the larvae of the tomato hornworm.

Cabbage Loopers

The predators and parasites of cabbage loopers attack both larvae and eggs, killing them for food as well as paralyzing them and depositing eggs in the larva or egg. When the parasitic egg has hatched, it will feed on the cabbage looper larva or egg.


The parasitic wasp lays its eggs inside the cabbageworm's egg. You can attract parasitic wasps by planting nectar and pollen producing plants in the garden or near crops.

If trying to attract these natural predators doesn't work, they can also be purchased from companies who raise them.


Plant the pollen or nectar producing flora as soon as possible according to the temperature of your area. Most local greenhouses and garden centers can help you determine the right planting time.

Contact a company that breeds beneficial insects to find out when they should be purchased and released for maximum hornworm control.


Environmental Controls


Removing crop remnants, tilling the soil, and handpicking larvae are all methods that will help control these caterpillars. Using covers on rows of plantings of the cabbage family will not only help to keep out the cabbageworm but will also keep out the cabbage looper and other pests.


Handpick then destroy the caterpillars when you have found them. Remember not to disturb any caterpillars having white cocoons on their bodies. These are the pupae of the parasitic wasp. Place covers on rows of plantings according to the accompanying instructions or seek direction from your local home and garden center.


As soon as you find any of these caterpillars, just pick them off the foliage and destroy them, again taking care not to remove those with white cocoons on their backs. Use covers on rows of plantings of the cabbage family before the pest appear.

Why Organic

Why Organic?

The benefits of choosing organic gardening methods in your lawn and garden are exponential! In addition to helping improve the environment and decreasing the chances of accelerated disease in your family, living an organic lifestyle can provide mental and physical benefits, long-term money-savings, and increased vitamin and mineral content in your soil, among other things.

Learn more:

Benefits of Going Organic

Organic gardening provides for intense, realistic flavors in your food, and higher vitamin and mineral content than in conventionally produced foods. Organic Gardening: It's good for the environment and healthier for you and your family!

Organic vs. Natural - How to Read Labels

In the world of pesticides and repellents the words "organic" and "natural" are often mistakenly used to replace one another. Understanding product labels and certifications can help clear up the confusion.


Expert Tips for a Beautiful Organic Garden!

Gardening can be a very rewarding and healthy undertaking. By using products and methods that comply with organic gardening standards, plants grow better, insect pests can be controlled, plant diseases can be eliminated, and lush harvests can be enjoyed!

Learn More About Organic Gardening:


Plant Disease Control FAQs


Q: How do I know if my plant is being attacked by an insect or a disease?

A: If it’s an insect, the plant may have holes in its leaves. Turn the leaves over and you may see the insects themselves clustered on the underside of the leaves. You may also see and feel a sticky substance if it’s an insect because the insect will leave a secretion on the plant. More»


Q: My pumpkins' leaves have white powder on them. What is it? How do I get rid of it?

A: It sounds like you are talking about powdery mildew. There are fungicides, such as Safer® Brand Garden Fungicide, on the market that can work effectively in controlling powdery mildew. More»


Q: How do I get rid of anthracnose on my dogwood tree?

A: The best way to control anthracnose includes several measures. Starting with varieties that are resistant to disease, especially anthracnose. Be sure to prune the tree during the dormant season by removing dead branches. More»

More FAQs»


FAQs About Insects in Your Garden


Q: Is a spider mite an insect or is it actually a spider?

A: Spider mites belong to a class called arachnids, to which spiders also belong. They are not actually insects. They do cause plenty of problems for plants, however, unlike their larger relatives. More»


Q: My cabbage and broccoli plants are being eaten by bugs that look like they have a colorful shield on their backs. What are they and how do I get rid of them?

A: These pests are known as harlequin bugs. Products containing Insecticidal Soap (potassium salts of fatty acids) and Pyrethrin are very effective on these nasty pests. More»


Q: My neighbor told me I have scales on some of my ornamental plants. What are scale and how do I get rid of them?

A: Scale are tiny insects that attack many plants, sucking the sap or juices from the plants and plant leaves. Insecticidal sprays and Neem Oil products are effective in controlling these pests. More»

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