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

Model #: 5163-6

3 reviews
0 5 5

Reward Points with My Account


  • Kills caterpillars and worms.
  • Makes up to 32 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 II– 16oz Concentrate with B.t.– How It Works Safer® Brand Caterpillar Killer Concentrate uses a naturally occurring bacterium to kill and control caterpillars and other leaf-eating worms. The caterpillars and worms that are damaging your plants will stop feeding immediately after ingesting the bacterium, which is known scientifically as Bacillus Thuringiensis var. Kurstaki (B.t. for short). Plus, when Caterpillar Killer is used as directed, it has no effect on birds, earthworms, or beneficial insects such as honeybees and ladybugs.

This economical concentrate is easy to mix into a ready-to-use solution. And, because Caterpillar Killer is OMRI Listed® and compliant for use in organic gardening, you know that you’re controlling leaf-chomping caterpillars in a way that fits into your organic garden plan.

Caterpillar Killer
Best used for:
Organic Gardening
Organic Gardening
Kill Caterpillars and Worms
Killing Caterpillars & Worms
Stops Feeding Damage
Stops Feeding Damage
Spares Beneficial Bugs
Spares Beneficial Insects
Economical Concentrate
Economical Concentrate
Caterpillar Concentrate Closeup

Say Goodbye to Caterpillars and Leaf-Eating Worms Fruits, vegetables, shade trees and ornamentals are all susceptible to the damage from worms and caterpillars. These nuisance pests will eat their way through foliage and cause irreparable damage to plants extremely quickly. That’s why it’s important to stop these caterpillars and worms right away with Safer® Brand Caterpillar Killer!

Target These Pests Use Safer® Brand Caterpillar Killer Concentrate to target these problem insects:
  • Tent Caterpillars
  • Gypsy Moth Caterpillars
  • Tomato Hornworm
  • Cabbage Looper
  • Imported cabbage Worm.
  • Bagworm
  • Spring Cankerworm
  • Fall Cankerworm
  • Elm Spanworm
  • Fall Webworm
tobacco hornworm
tomato with wormhole
Identify Damage Eliminate a variety of caterpillar & worm species. Visible damage from each will be different. Tomato hornworms eat entire leaves, stems, and the fruit of the plant, causing it to look like someone took a bite. Other worms, like tent caterpillars & fall webworms, form webs on trees & shrubs resembling white bags made of spiderwebs. Below these “tents” are dozens of caterpillars eating the leaves.
tent caterpillars
Caterpillars on Cabbage

B.t. to the Rescue Bacillus thuringiensis var. kurstaki is a naturally occurring bacterium that kills certain leaf-eating worms and caterpillars. Simply spray Caterpillar Killer onto trees, shrubs and vegetables so that worms and caterpillars eat the treated vegetation.

The bacterium includes a toxin that stops them from feeding or causing more damage to your plants. Within a few days, effected caterpillars and worms will die of malnutrition. Safer® Brand Caterpillar Killer can be used until the day of harvest, so you can protect your plants through their entire growth cycle.

Won’t Harm Beneficial Insects When Used as Directed Safer® Brand Caterpillar Killer controls and eliminates a variety of destructive caterpillars and worms. When used as directed, this treatment won’t harm birds, earthworms and beneficial insects, such as honeybees and ladybugs. These beneficial organisms are important to our ecosystem, and their survival is vital to the continued production of nutrient rich soil and the natural pollination process of flowers, fruits and vegetables.
won't harm beneficial insects
How to Use

How To Use Caterpillar Killer Mix caterpillar killer as directed to achieve desired amount of solution. Once Caterpillar Killer is sprayed onto plants and the treated vegetation is ingested by caterpillars and worms, feeding and damage will stop immediately. Keep in mind that more caterpillar eggs may hatch, so it’s best to monitor the area for newly hatched pests even after treatment. If more caterpillars are noticed, you may need to repeat the treatment again after 5-7 days. It’s recommended to apply Caterpillar Killer late in the afternoon or on cloudy days as B.t. can breakdown in excessive sunlight.

An Economical, Easy-to-Mix Solution This 16 oz bottle contains a concentrated solution that creates over 250 times that amount in usable caterpillar-killing solution. Simply mix a small amount of concentrate with water as directed until you reach the desired amount of solution. Store any unmixed concentrate in a cool place for later use. One 16 oz bottle of concentrate makes up to 32 gallons of solution and protects over 10,000 square feet of plantings.
Economical Concentrate
Omri Listed
Compliant For Use In Organic Gardening Safer® Brand Caterpillar Killer Concentrate has been third-party reviewed for use in organic gardening by Organic Materials Review Institute. It carries the OMRI Listed® seal, and it has been deemed compliant for use in organic gardening by the USDA’s National Organic Program. With Safer® Brand, you have an economical solution to get rid of caterpillar and worm pests in your garden while staying true to the organic gardening regimen that you, your family and your plants love.
Five Stars "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 from Anonymous)  Read More Reviews »
Safer® Brand Caterpillar Killer Product Details Do you want to know more helpful details about Caterpillar Killer? Take a closer look at the in-depth specifications for this product. Complete Product Details »
Safer® Brand Caterpillar Killer Product Details
Model # 5163-6
Size 16 fl oz
Makes Up to 32 Gallons of solution
Active Ingredients B.t. - bacillus thuringiensis var Kurstaki 98.35%
Eliminates Caterpillars and worms
For Use On Trees, shrubs and vegetables
Learn More About Insect Pests Safer® Brand Caterpillar Killer eliminates leaf-feeding caterpillars and worms that eat and destroy the leaves and fruit of many trees, shrubs and vegetables. Check out some of our great resources to learn more about the destructive caterpillars that Caterpillar Killer eliminates.
About SAFER® BRAND 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! More About SAFER® BRAND »
Safer® Brand Caterpillar Killer Concentrate
Model # 5163-6
Size 16 fl oz
Makes Up to 16 gallons of solution
Active Ingredients B.t. - bacillus thuringiensis var Kurstaki 98.35%
  • Bagworms
  • Cabbage Looper
  • Elm Spanworms
  • Fall Cankerworms
  • Fall Webworms
  • Gypsy Moth Caterpillars
  • Imported Cabbage Worms
  • Spring Cankerworms
  • Tent Caterpillars
  • Tomato Hornworms
For Use On
  • Broccoli
  • Cabbage
  • Cauliflower
  • Celery
  • Collards
  • Kale
  • Lettuce
  • Melons
  • Mustard Greens
  • Ornamentals
  • Shade Trees
  • Tomatoes
  • Turnip Greens
Usage Notes
  • OMRI Listed® and compliant for organic production.
  • Apply at first sign of infestation.
  • Apply up to the day of harvest.
  • Spray leaf surfaces thoroughly & on top and bottom of leaves.
  • Follow individual application instructions.

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 19, 2018
does the job By Pete

since I have been using Safer caterpillar killer I have had no problem with caterpillars eating my plants

Review Rate
Review posted on
September 27, 2017
Great product By Deboy

Had tried everything to get rid of the oleander caterpillars prior to using your caterpillar killer.....safer truly works!!!!!

Review Rate
Review posted on
August 2, 2017
best catipiller killer on the market By AL

When ever I have a catipiller problem I always use safer brand to get rid of the problem. It works perfect ever time

Read All Reviews (3) Write a Review
Q.What color should the Safer Caterpillar killer concentrate with BT be? Mine is brown. Has it gone bad? Thsnks

This product should be tan in color. long does sprayed bush need to dry before it rains in order to retain effectiveness

We do not have a specific recommended dry time for this product. The B.T. will begin to breakdown quickly once in sunlight. We recommend reapplying after a heavy rain.

Q.can you mix caterpillar and insect soap together ?

While we doi not recommend mixing these two products, they may be used one after another. The Safer® Brand Caterpillar Killer II with B.T. Concentrate must be ingested. The Safer® Brand Insect Killing Soap is topical and will cover the Caterpillar Killer in Insect Killing Soap, and the insects will not eat it. We recommend spraying the soap first to kill what’s there, wait a couple days for it to dry/wash off, and then spray the Caterpillar Killer to prevent further damage.

Ask Your Own Question
  • Yes, sign me up for an eNewsletter subscription so that I can receive information about products, enhanced services, exclusive sales and other special offers.

  • Reload captcha