According to the Collins book of Pests, Diseases & Disorders of Garden plants "Encarsia formosa gives good results in daytime temperatures above 21C and is widely used in commercial horticulture". It's a parasite that lays eggs in whitefly scales.
The book also says you can use a hand held battery operated vacuum cleaner to get rid of the flies.
If you use the yellow sticky things, disturb the plant foliage regularly to maKe the flies fly upwards onto the traps (hang it above the plant).
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The book also says you can use a hand held battery operated vacuum cleaner to get rid of the flies.
If you use the yellow sticky things, disturb the plant foliage regularly to maKe the flies fly upwards onto the traps (hang it above the plant).
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