Biological Insecticide
BT NOW is a water-based, biological insecticide that utilizes a novel strain of bacteria, Bacillus thuringiensis ssp. kurstaki (Btk), to offer targeted control of the caterpillars of certain moths and butterflies on a wide variety of crops. Ingestion of BT NOW paralyzes the insect’s digestive system within hours, halting further crop damage potential. The affected larvae die within 2-5 days.


What is BT NOW's mode of action?

The Bacillus thuringiensis ssp. kurstaki (Btk) bacteria found in BT NOW contains natural insecticidal endotoxins called “cry toxins”. When consumed by the larval stage of target lepidoptera pests, these toxins bind to specific receptors in the insect’s gut which immediately disrupts and paralyzes certain digestive functions. After the pest consumes Btk, plant tissue will be protected from further damage as the pest halts all feeding within hours. As the activated toxins disrupt membrane integrity in the caterpillar’s midgut, Btk spores enter the body, proliferate and kill the pest 2-5 days later.

Caterpillar Control in Fall Ornamentals

BT NOW and Trichogramma are two naturally occurring biological organisms that specifically target lepidopotera species and when used together create an effective caterpillar management program. This combination achieves excellent control of caterpillars without harmful residue and without disrupting beneficial insect populations.

How should BT NOW be used?

Bacillus thuringiensis ssp. kurstaki products have a long history of safe and effective use in agriculture, forestry, and ornamental pest management. When applied properly, Btk products control lepidoptera larvae as well as traditional synthetic chemistries while also preserving beneficial species.

BT NOW is most effective on young, actively feeding larvae. For optimal results, employ early scouting programs to identify target caterpillar infestations and apply at first signs of feeding or when scouting program identifies pest presence. Cover foliage thoroughly to ensure product is consumed by the pest. Repeat applications when necessary to maintain control.

  • Armyworm
  • Looper
  • Leafroller
  • Skipper
  • Moth
  • Caterpillar
  • Fruitworm
  • Cutworm
  • Hornworm
  • Budworm
  • Webworm
Labels & Certifications
OMRI Listed logoState of California outline

Not all uses and applications are approved in all states/provinces. Always consult a product’s label before use.

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