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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

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