For the last few years I have had a whitefly problem on brassicas. In June I was invaded suddenly by greenfly too but I decided to allow nature to help. Within a few weeks all the greenfly were gone and the whitefly never got a real hold (yet!). Is it co-incidence that I have a large wasps nest in a small outbuilding on the veg garden? It's about the size of a football cut in half and looks magnificent. As it was out of the way of the family I left the wasps alone. Co incidence perhaps but are the wasps actually keeping other pests at bay?
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I believe wasps eat huge quantities of insects early in the year. They don't come looking for your jam sandwiches until midsummer and autumn.