Plant extracts as biopesticides against pests

Two locally available and well-known plants, such as common tansy Tanacetum vulgare L. and wormwood Artemisia absinthum L. were tested for insecticidal activity. They were found to produce a variety of effects against the white large cabbage butterfly Pieris brassicae l., the Colorado potato beetle Leptinotarsa decemlineata Say and the greenhouse whitefly Trialeurodes vaporariorum Westw. These plants affected the feeding activity, behavioural pat-terns, the development and induces mortality in the insects