Met52® EC Bioinsecticide is composed of spores of the insect pathogenic fungus Metarhizium anisopliae strain F52. Once the product is sprayed onto the foliage or applied as a soil drench, insects that come into contact with the fungus will become infected. The spores of Metarhizium anisopliae attach to the surface of the insect, germinate and begin to grow. It will penetrate the exoskeleton of the insect and grow inside the insect, causing the insect to die. Under moderate temperatures it usually takes 3 to 7 days, once the insect is exposed, for death to occur.