500 Encarsia Formosa

I did a lot of research, about timing, proper temps to use these, time of day to put out (evening) adding moisture by spraying the grapes prior, and misting again daily, but Not on the cards, because they do like moisture and we have little humidity here in the high altitude southwest. Google these for more specifics.But they worked, the white flies that covered our grapes almost went away completely in about 5 days.Will use again when temps are right in spring, as they do not survive frost. AND, we have had 2 years of white flies in an organic type garden. Yellow glue traps were not for me, as they would trap predators as well, and we have lots of predators due to our extremely low use of chemicals.

I bought these to use on whitefly infestation. As far as I can tell, not one single egg hatched from any of the cards. Gave up on them and bought ladybugs from another source.