Safer® Brand Caterpillar Killer II With B.T. Concentrate 16oz

Model #: 5163

23 reviews
0 5 4.8

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  • Kills caterpillars and worms.
  • Makes up to 16 gallons of solution from one 16 oz bottle.
  • OMRI Listed® and compliant for organic gardening use.
  • Contains B.t. Kurstaki.
  • Can be applied up to and on the day of harvest.

Safer® Brand Caterpillar Killer with B.t.

Safer® Brand Caterpillar Killer with B.t. (bacillus thuringiensis var. Kurstaki) is an effective organic solution for caterpillar and worm control. Caterpillar Killer kills worms and caterpillar stage insects, but has no effect on birds, earthworms, or beneficial insects, such as honeybees and ladybugs, when used as directed. Worms and caterpillars eat treated foliage then immediately stop feeding and damaging plants.

Effective for: Cabbage looper, imported cabbage worm, tomato hornworm, bagworm, spring cankerworm, fall cankerworm, gypsy moth, tent caterpillar, elm spanworm, fall webworm.

How it Works

When the B.t. is ingested by the worm, it works as a gut rot poison that makes the worm stop feeding. The caterpillar or worm will stop feeding immediately and die within days of malnutrition. This caterpillar killer will keep your lawn and organic garden, free from caterpillars all year long.

It is recommended that this product be applied late in the afternoon or on cloudy days since B.t. breaks down in the sunlight.

Carefully read and follow all directions on the product's label. B.t. is very specific and only works on caterpillars and leaf feeding worms. 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.

Application Rates:

Apply Safer® Brand Caterpillar Killer when pests are first noticed and repeat every 5-7 days or as necessary. Caterpillar egg hatching can occur over an extended period of time. Monitor treated areas for the presence of newly hatched pests and retreat if necessary. Thorough leaf coverage is necessary for effective control. After ingesting a treated portion of the leaf, caterpillars stop feeding in a few hours and death occurs in a few days.

Safer® Brand is the leader in alternative lawn and garden products. Safer® Brand recognizes the growing demand by consumers for these products, offering a wide variety of natural and organic solutions for lawn, garden, landscape, flowers, houseplants, insects and more!


Safer® Brand Caterpillar Killer with B.t. - Specs

Product Features:

  • Kills caterpillars, gypsy moth larvae, worms and cabbage loopers
  • OMRI Listed®
  • Contains B.t. - bacillus thuringiensis var Kurstaki -- 98.35%

What's in the Box:

  • (1) 16 fl oz concentrate bottle


  • Makes up to 16 gallons of solution

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
May 12, 2017
Ratio for mix? By Ellie

Safer with BT for leaf rollers. Sm. container of concentrate arrived. Didn't find any suggestion of concentrate to water spraying. And it would be more user friendly if the telephone number you show on the website is all numbers!!!

Response From Safer Brand®
Susan : Consumer Relations Representative

Hello Ellie,

The recommended ratio will vary depending on what type of plant it is being used for.  When using on fruits and vegetables, we suggest using 1.5 fluid ounces per 3 gallons water (1 tablespoon per gallon).  For shade trees and ornamentals, we recommend 2 fluid ounces per 3 gallons of water (4 teaspoons per gallon).

We hope this information is helpful.  Please feel free to contact our Consumer Relations Team at 1-855-7-ORGANIC (1-855-767-4264) with any additional questions.

Review Rate
Review posted on
August 27, 2016
Easy process By Lynn44
I ordered the caterpillar killer a few weeks ago. The process could not have been easier and it arrived quickly. I'm very pleased.
Review Rate
Review posted on
June 30, 2016
Evergreen happiness By Green Linda
We have several lovely evergreens, in fact so many that a child thought maybe Santa lived here. Well, those lovely white moths fluttering like decorations on the bushes left nasty caterpillars. They wiggle no more! One application and Santa's trees are safe again...even in HOT Texas!
Review Rate
Review posted on
May 9, 2016
easy application By Pattip1012
I love BT. gets ride of the cabbage worms and flea beetles (that get on eggplant leaves)
Review Rate
Review posted on
April 26, 2016
Excellent RESULTS Everytime.
Review Rate
Review posted on
April 7, 2016
It works! By Sunny
Cankerworms have been a serious problem in the Charlotte, NC region for the past 30 years, and a plague for the past 7-8 springs. Even banding 47 trees barely puts a dent in the problem. We received the "Caterpillar Killer" about 3 days after the 2016 munching began. The leaves we were able to reach (with a 12 ft. ladder and a high spray arc) have some 'nibbles', but they're doing great. The leaves we could not reach are mostly leaf ribs. We're spraying every 5 days. BTW, a 12 oz bottle of the concentrate goes a long way.
Review Rate
Review posted on
March 20, 2016
Safer® Brand - Safer® Brand Caterpillar Killer II By cholula
I'm so happy whit this product.
Review Rate
Review posted on
June 15, 2015
Awesome product! Thank you! By
Living in Florida our squash and watermellon crops were being taken over my the cucumber moth caterpillar (Diaphania indica). Looking for a safe, organic solution. I could not believe how well this worked. One spray and two days later no caterpillars!!!
Review Rate
Review posted on
April 25, 2014
Amazon Review By
I have tried several products to kill hornworms on my royal princess tree. This product stops hornworms caterpillars in their tracks. I have been losing plants for two years now until I found Safer. It does not leave any noticeable residue on leaves like other products. A great product. Thank you
Review Rate
Review posted on
April 7, 2014
Amazon Review By
using this product as advertised,i found no problem with leaf eating insects..follow the directions on application rates and when to works well...!!!
Read All Reviews (23) Write a Review
Q.If the solution is applied before it rains, will it still be effective? If not, how long does it need to sit before getting wet?

We recommend waiting 12 hours to water. It would also need to be reapplied after a heavy rain.

Q.You previously stated not to use pressure washers to apply the solution.   I am assuming that the high pressure is detrimental and ag equipment in the 600psi range is ok as what you describe as a 'sprayer'.?

We would recommend only to use a hand sprayer or hose-end sprayer for application.

Q.Is it safe for dogs and cats?

We recommend that children and pets be kept out of the area until the product has dried.

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All About

All About Caterpillars in Your Garden

By learning about the many caterpillars that inhabit your veggie & fruit garden, you will find safe, effective methods of controlling them so you can have a healthy harvest without adding toxins to our environment.

Learn More:

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) is an effective method of eliminating your garden or field of the tomato hornworm without environmental concerns or harm to birds and beneficial insects.

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. It will not harm beneficial insects, birds, or earthworms when used as directed.

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

Safer® Brand offers a variety of control products for tomato hornworms, cabbage loopers and cabbageworms to help control and eliminate these garden pests and revive your plants. Please check out our tomato hornworm, cabbage looper and cabbageworm control products for more details about how they work and how, when, and where they should be applied.

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 day or when temperatures exceed 90°F


Natural 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 grow 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 raises 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.


Expert Tips for a Beautiful Garden!

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

Learn More:


FAQs About Insects in Your Tomato Garden


Q: My plant leaves look chewed! Do you know what type of insect might do that?

A: Insects that have the ability to chew plants must have special cutters in their mouths for this purpose. Such insects may include caterpillars, beetles, and grasshoppers, for example.


Q: If I use a floating row cover, how will bees and pollinating insects reach the plants?

A: They won’t be able to so you will need to pollinate them yourself by hand. Check with your local garden center or farm supply store to find out how to hand pollinate them. You may want to remove the row covers during times of insect pollination.


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.


Q: I have really big larvae in my garden, and my neighbor says they are Tomato Hornworms. They are attacking my tomatoes, peppers, and eggplants. How do I get rid of them?

A: B.t. (Bacillus Thuringiensis) is an excellent way to get rid of them without harming beneficial bugs. It actually works on most caterpillars. When the worm ingests the B.t., it works as a gut rot poison that makes the worm stop feeding. The tomato hornworm will stop feeding immediately and die within days.

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