How do you control white fly on tomatoes?

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

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