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with the biological control Steinernema carpcapse.With heavy infestations, use an insecticide based on pyrethrum (only use once a season on crops).brassicas and nasturtiumsearly spring to autumnCommon problems when growing vegetables

are your best allies. Ladybirds can be bought as a biological control, and you can also buy ladybird houses to encourage these helpful creatures to take up residence in your garden. They need time to tackle the problem, so don't expect them to hoover up

lookout after dark. In the greenhouse or conservatory, you could use the biological control Trichogramma brassicae, which is a tiny wasp that targets caterpillar eggs.The moment you find signs of caterpillars, spray the plants with pyrethrum.just about

plant debris. Wrap copper tape around the rims of vulnerable pot plants. From early spring to late-autumn, consider using a biological control, such as Nemaslug.There's a wide range of brands, with those containing aluminium sulphate being less toxic

above 10 celsius in the greenhouse you can use a biological control, such as the parasitic wasp, Encarsia formosa, which attacks the juvenile forms of whitefly.Sprays with products containing imidacloprid and thiacloprid, which are absorbed by the plants