INSECT CONTROL—MODE OF ACTION The lepidopteran larvicidal properties of Leap are due to the well-known biorational control agent Bacillus thuringiensis subsp. kurstaki (Btk) strain ABTS-351. Leap contains the same strain of Btk found in DiPel , the most used Bt insecticide in the world. Btk strain ABTS-351 produces Bt spores and four different insecticidal proteins (Cry toxins) that form a crystalline matrix in the Bt bacteria. When sprayed on a plant and ingested by susceptible Lepidoptera larvae, these crystals dissolve in the caterpillar stomach, releasing the Cry toxins, which bind to insect-specific receptors in the gut walls. The toxin proteins break down midgut cell walls causing a massive physiological imbalance, which results in localized cell death. Cell disruption allows viable Bt spores to invade and colonize the insect body. Minutes after consuming Leap , insects stop feeding and ultimately die. Leap ’s fast-acting insecticide mode of action helps lessen disease incidence by reducing leaf damage from caterpillar feeding, thereby limiting potential entry points for pathogens. LEAP VS. INDUSTRY STANDARD
In addition to its proven disease management, Leap is as effective as DiPel ES to control beet armyworm ( Spodoptera exiguars ). *All applications 1 qt/A Yuma, AZ. Two applications: first at 2-leaf stage, second application at 4–5 leaf stage.
6
4
2
0
DiPel ES
Leap
Untreated
30
Leap is also as effective as DiPel ES in the control of tomato hornworm ( Manduca quinquemaculata ).
20
Leap and DiPel ES* applied every other week, for a total of four applications. *Note: 1 quart of DiPel ES is equivalent to 1 lb of DiPel DF.
10
0
44 Days After Treatment
51 Days After Treatment
DiPel ES 1 qt/A
DiPel ES 2 qt/A
Leap 1 qt/A
Leap 2 qt/A
Untreated
70
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