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Whitefly in a greenhouse can be controlled using a biological control method.
You can buy a parasitic wasp called Encarsia formosa. The females of the wasp lay their eggs on the whitefly. The wasp larvae hatch out and eat the whitefly, changing their appearance from white to black, so you can see the progress of the control.
Encarsia is killed by insecticides so don't combine this with spraying.
For more information see:
http://www.ext.colostate.edu/pubs/insect/05587.html
http://www.rhs.org.uk/advice/profiles0500/whitefly.asp
http://www.ipm.ucdavis.edu/PMG/r783301211.html
personaly i doubt you can manage to truly control whitefly at a garden level using biological control, i'd try netting or insecticides
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoim not sure about green fly but i had these tiny black fly's in my plants about to years ago i put a drop of washing up liquid in the water yes washing up liquid worked wonders killed them all in 2 days spray on leaves of the plant at night as well as when you water them once the fly's are gone stop adding the washing up liquid or you may get funny tasting tomato's
if you don't like the idea i'm sure there are products you can buy at a garden centre to help
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