How long will a biopesticide survive in the crop canopy when sprayed?

A biopesticide spray may not survive more than about 12 to 48 hours if it is exposed to the UV in sunlight in the canopy or very hot and dry conditions. However. If the spray comes into contact with the target pest and recognizes the host – it will germinate, penetrate and infect the inside of the pest, where it is immediately protected from the harmful effects of challenging environmental conditions.
If the spray is directed effectively to the under leaf surface on the lower part of the canopy the EPF can sometimes be seen growing on the pest cadaver (dead body). In the absence of the host, the EPF will not establish and grow on leaves.