Use for the biological control of whitefly eggs and larvae. Easy to apply vermiculite can be sprinkled directly onto plants and release predators quickly to actively seek out or await passing prey. Each tube contains Amblyseius swirskii predators and can be used preventatively or at the first signs of pest’s presence. Whitefly killer can be used in combination with Encarsia formosa parasitic wasps to help further control whitefly pest populations. Only apply if temperatures in the growing environment are above 20 degrees Celsius and avoid placing sachets in direct sunlight.