Lesson 01 · Natural Pest Defense and Disease Prevention
Organic Sprays: Horticultural Oils, Bacillus Thuringiensis, and Potassium Bicarbonate
Bacillus Thuringiensis (Bt) for Leaf-Chewing Caterpillars Bacillus thuringiensis subspecies kurstaki (Bt-k) is a naturally occurring soil bacterium that produces crystal proteins toxic specifically to the larvae of moths and butterflies. When a caterpillar ingests foliage coated with Bt, the alkaline environment of its digestive tract activates the endotoxin, paralyzing the gut within hours and causing death within two to three days.

