white flies


hi . my garden is totally infested with white flies far beyond the economic injury level in certain areas.
i have tried all sorts of pesticides but they just move to higher plants and then come back to infest the lower areas. now i would like to go for biological control.i 've heard that the lady bird beele is a predator on white flies. does anyone know the exact amt. to be released/ha and the manner in which it should be left also the appropiate season if any.
thanx
jayesh
 


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