What is Btk (Bacillus thuringiensis subspecies kurstaki)?
• Bacillus thuringiensis subspecies kurstaki or Btk is a naturally occurring bacterium in soil. • In Canada, Btk has been used as a biological pesticide for over 30 years to control pests, such as the gypsy moth, that infest our forests and agricultural lands. • It is also used on organically-grown produce.