I've got the sticky cassette for them but there are so plentiful in the greenhouse that they are full inwardly a week.
Answers:
Provado Pest Free
Simply mix & water on last for up to six month
Have you tried Neem oil? I used it on several plants--it worked on most, but a few did not rework.
You need a predatory wasp call Encarsia, they eat white fly and are considered life. They are available from several suppliers in UK. Just type contained by Biological Control into your search engine.
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