BIOLOGICAL ACTIVITY OF THE PRODUCT PIRETRO NATURA EC TOWARDS THE PESTS IN VEGERTABLE CROPS GROWN IN GREENHOUSES

Abstract

Botanical insecticides are a small fraction of the total volume of pesticides. Nevertheless, they are of importance in the control of the pests in vegetable crops. Sometimes the phytopesticides provide the most effectiveness control on pests that have become resistant to other insecticides. Most of these insecticides are with short period of disintegration in the environment and pose a relatively low risk both for non-target organisms and beneficial species. They are naturally occurring or derived products and they are accepted into organic and integrated production systems. The product Piretro Natura EC (a. s. pyrethrins) has been tested under greenhouse conditions to determine its biological activity against cotton leaf aphid (Aphis gossypii Glov.), peach aphid (Myzus persicae Sulz.) and greenhouse whitefly (Trialeurodes vaporariorum Westw.). Very good aphicidal activity of the tested product was found at a dose of 75 ml/da on the 3rd-5th day after treatment. A good effectiveness (79,74%) of the Piretro Natura EC was observed at a dose of 75 ml/da, towards the greenhouse whitefly adults on the 5th day after treatment. The effectiveness of this product towards the larvae of the greenhouse whitefly was satisfactory – 60,68%.