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Can Thuricide be used on edible crops?

Yes, it can and you can use it right up to the day before harvest. Use it on fruits, vegetables, ornamental & shade trees and shrubs. Thuricide can also be used in greenhouses and on lawns for webworms.

It comes with complete instructions on all it's uses and mixing ratios.

Thuricide Concentrate
Bacillus Thuringiensis Kurstaki
for Caterpillar control


Thuricide is used to control caterpillars as needed. It is easy to mix and apply. Apply by hose or pressurized sprayers, mist blowers, or aerial application, 1/2 tsp to 4 tsp per gal of water depending on extent of infestation. Even a little squirt bottle may be used. We recommend that you get an ID on the caterpillar you are treating for. We don't want to kill the caterpillars that will turn into beautiful butterflies. The easiest way to use it is to just spray the specific plants you want to protect like your tomatoes for tomato hornworms. If you have planted dill to feed the Swallowtail caterpillars or milkweed to feed the Monarch larva- don't use Thuricide on these plants.

  • Use the Garden Syringe for precise BTK applications in insect holes like squash vine borer, tree, shrub and plant borers.

Advantages of using Thuricide

  1. Thuricide, unlike certain chemical insecticides, may be used anytime a specific caterpillar appears. Treated crops may be picked, washed and consumed  the day after any Bt variety is applied.
  2. People and critters can return to the treated area immediately after the spray has dried.
  3. The active ingredient in Thuricide, Bacillus Thuringiensis v. Kurstaki has been proven commercially to selectively affect only leaf eating caterpillars.

BTK will not work against non-feeding stages of insect development. For example the egg, pupae and adult stages of their life cycle. It is best applied when the caterpillars are young and actively feeding. Cover the upper and lower surfaces of the leaves to increase effectiveness. At application time the leaves should be dry and no imminent rainfall is expected. Repeat application every 7 to 10 days. If egg hatching is occurring over an extended period of time then make a second spray application 3 to 5 days later. Pest stops feeding in a few minutes after ingesting enough BTK. Death occurs in 3 to 5 days. BTK does not harm people, animals, birds or fish. BTK can be applied with a hose end sprayer, pump up sprayer, backpack sprayer or a high pressure sprayer.

What insects can Thuricide be used to control?

Bagworms, Coddling Moth Larva, Gypsy Moth Larva (best when used on their 2nd or 3rd instars), Spring and fall cankerworms, bag worms, corn borers, tent worms, fall webworms, California's red-humped caterpillar, cabbage loopers, imported cabbage worm, Diamond back moth larva, tussock moth, Eastern and Western Spruce budworm, celery looper, hemlock looper, grape leaf folder, leaf folders, leaf miners, lea rollers, pine processionary moth, spruce budworm, jack pine budworm, tomato and tobacco hornworms and tomato fruit worms- to name a few.

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16 oz Liquid $ 18.99 ea.

16 ounces of concentrate
makes 24-96 gallons
of finished spray. Treats up
to 10,875 square feet.



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To find out more about the BT type pesticides and their safety click here to visit the Pesticide Management Education Program with Extonet's BT profile.

The Garden Syringe
is ideal for injecting
borer holes.



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