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  1. Home
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  4. Caterpillars & Moths
  5. Monterey Bt Liquid Concentrate
Monterey Bt Liquid Concentrate

Monterey Bt Liquid Concentrate

OMRI Listed. A fast-acting microbial insecticide spray for controlling caterpillar infestations.
5 star rating
Write a Review
  • Concentrate - 8 oz NEW SIZE!
    SKU: 1201209
  • $13.49
  • Concentrate - Pint
    SKU: 1201210
  • $14.99
  • Concentrate - Quart
    SKU: 1201211
  • $22.99
  • Concentrate - Gallon
    SKU: 1201212
  • $81.99

Description

OMRI Listed Monterey Bt Liquid Concentrate is a biological insecticide whose active ingredient is the beneficial bacteria Bacillus thuringiensis subspecies kurstaki strain SA-12 (Btk). This biopesticide works by introducing bacterial spores and toxins into the body of the insect larvae as it feeds on foliage. These toxins quickly disrupt, and soon completely stop, normal digestive functions of the pest insect. The infected larvae will cease eating within minutes and fully succumb to the effects of the BTK and die within 2-5 days.

Btk only affects the larval (caterpillar) stage of the the Lepidoptera order of insects. The Lepidoptera order includes gypsy moths, cabbage loopers, tomato hornworms and grape leaf skeletonizers. When used as directed it has no effect on birds, earthworms, or beneficial insects such as honeybees and ladybugs

  • Btk is not an effective control for corn earworm or squash vine borer.
  • Use only in a home garden setting.
  • Can be used on edible plants up to the day of harvest.
  • For best results, use at the beginning of the pest's life cycle (1st and 2nd instars)
  • Can be used on fruit and shade trees, vegetables, ornamentals and many other plants.
  • OMRI listed for use in organic gardening.

Shop all Monterey products here

This Product Controls These Pests or Diseases: Bagworms, Cabbage loopers, Elm Spanworm, Fall Cankerworm, Fall Webworm, Spongy Moth, Imported Cabbage Worm, Spring Cankerworm, Tent caterpillars, Tomato Hornworm and more.

Instructions

GENERAL USE INSTRUCTIONS:

  • Apply when worms or caterpillars are first noticed, then repeat at five (5) to seven (7) day intervals while they are active.
  • Apply more frequently to control heavy infestations.
  • Can be applied up to and on the day of harvest.

HOW TO MIX AND APPLY:

  • Can be applied with a hand sprayer or a hose-end sprayer.
  • Always shake or stir thoroughly before use.
  • Partially fill sprayer with water before adding the application rate amount of product, then mix in product thoroughly and add remaining amount of water.
  • Spray leaf surfaces thoroughly, top and bottom, for complete control. Reapply after heavy rains.
  • Agitate regularly while spraying.
  • Use all of spray mixture within 24 hours.

FRUITS & VEGETABLES:

  • Mix 2 fl oz per 3 gallons of water (4 tsp per gallon) for a hand sprayer and apply to all plant foliage to cover an area of 1,000 square feet.
  • Apply at first sign of infestation and repeat at weekly intervals when needed to maintain control.

SHADE TREES & ORNAMENTALS:

  • Mix 2 fl oz per 3 gallons of water (4 tsp per gallon) for a hand sprayer.
  • Apply at first sign of infestation and repeat at weekly intervals when needed to maintain control.
  • Apply to thoroughly cover all foliage surfaces of shade trees and ornamentals for control.

TO CONTROL GYPSY MOTHS:

  • Apply when buds swell, but before leaves are fully open.
  • If eggs hatch over a long period of time or if reinfestation occurs, spray about 14 days after first appearance.

For more detailed information, including the use on specific crops and pests, please refer to the manufacturer's label under the DOCS tab.


Environment:

To protect the environment, do not allow pesticide to enter or run off into storm drains, drainage ditches, gutters or surface waters. Applying this product in calm weather when rain is not predicted for the next 24 hours will help to ensure that wind or rain does not blow or wash pesticide off the treatment area. Rinsing application equipment over the treated area will help avoid run off to water bodies or drainage systems.

Storage: Store in a cool place. Activity may be impaired by storage at temperatures above 90ºF.

Technical

Warning & Toxicities:

KEEP OUT OF REACH OF CHILDREN. CAUTION: Causes moderate eye irritation. Avoid contact with eyes or clothing. Avoid breathing vapors or spray mist. Wash thoroughly with soap and water after handling.

Active Ingredients/Guaranteed Analysis:

B. thuringiensis kurstaki strain SA-12 solids, spores and Lepidopteran active toxins,

(At least 6M viable spores per mg)* .................98.35%

Other Ingredients: .......................................... 1.65%

Total: .............................................................. 100.00%

Docs

Product Label

SDS

Reviews

Reviews

Write a review

Awesome stuff
Jul 23, 2021  |  By Aaron Appleton
Works as advertised


Monterey B
Aug 31, 2020  |  By Jane G Alix
It killed the worms that was destroying my petunias. It definitely worked.


Tomato hornworm
Aug 24, 2020  |  By Haidrun Muschick
Excellent, got rid of my tomato hornworm in just one application and haven't been back since.


new customer
Aug 23, 2020  |  By Candace Woodbury
We received our product and got to right to work with it on the trees (BT substance for controlling web worms in trees - v prevalent here this late summer...) It has worked very nicely.....Thank you very much! Candy Woodbury


Wonderful product
May 6, 2020  |  By Archana dasi
Bought the BT for our tomato plants. It has helped a lot. Was promptly delivered. Thank you

SUGGESTED PRODUCTS:

  • DiPel® PRO DF
    DiPel® PRO DF
    $22.50
  • BT NOW®
    BT NOW®
    $79.99–$170.00
  • BONIDE® Captain Jack's™ Neem Max
    BONIDE® Captain Jack's™ Neem Max
    $13.99–$20.99
  • Fertilome® Dipel® Dust
    Fertilome® Dipel® Dust
    $7.99–$8.99
  • Monterey Bt Liquid
    Monterey Bt Liquid
    $14.49–$25.49
  • BONIDE® Thuricide - 16 oz Concentrate
    BONIDE® Thuricide - 16 oz Concentrate
    $16.99
  • BT NOW®
    BT NOW®
    $79.99–$170.00
  • DiPel® PRO DF
    DiPel® PRO DF
    $22.50
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Arbico Organics, Pest Control Supplies & Equipment, Oro Valley, AZ

Sales and Customer Service:
800-827-2847
or (520) 825-9785

Retail Store & Corporate Office
10831 N. Mavinee Drive, Suite 185
Oro Valley, AZ 85737-9531

©2025 ARBICO Organics. All Rights Reserved.

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