Here's some good news: greenfly and their hundreds of sap-sucking relatives aren't as big a headache for gardeners as they once were.
They've stopped making the RHS's list of top 10 problems and I hardly ever get cries for help from readers. I'd be surprised if the total aphid population has dropped much but suspect there are more predators in gardens controlling greenfly and blackfly numbers. When you don't use pesticides, you let lacewing and hoverfly populations grow. Tiny parasitoid wasps, spiders and ladybirds adeptly hoover up the pests, without you even noticing.
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