Experience with Combinations of Fatty Oil and Essential Oil Mixtures against Trialeurodes vaporariorum Westw. in the Peter the Great Botanical Garden

Greenhouse whitefly Trialeurodes vaporariorum Westw. (Hemiptera, Aleyrodidae) are becoming a very grave risk and have shown resistance to many synthetic insecticides. In recent years, a number of researchers have identified the repellent and insecticidal effects of plant fatty and essential oils. In this sense, the fatty oil of Azadirachta indica A. Juss. (Neem or nim from family Meliaceae) was topically applied to plants for protecting them against insects and bacterial diseases. In addition, essential oils produced from many plant species have a wide abiotic effect. In the course of our experimental work, the insecticidal and repellent properties of essential oils combined with A. indica fatty oil against greenhouse whitefly were revealed. using a mixture of different oils to protect plants from whitefly, taking into account recommendations for their dosage, showed the effectiveness of this were conducted to determine the potential of a mixture of A. indica fatty oil combined with the essential oils of the following species: Litsea cubeba (Lour.) Pers., Cinnamomum verum J. Presl, Tagetes minuta L., Juniperus communis L., Cymbopogon citratus (DC.) Stapf against whitefly infestation. It was established that the combined action of oils had a repellent and toxic (insecticidal) effect on the phytophage, and also reduced whitefly fertility (two-three times). A mixture of oils (fatty and essential) provided protection for a collection plant with minimal impact on the ecosystem, preventing the settlement and development of the pest population. In the experiments, no manifestations of pest resistance to the treatment of plants with a mixture of oils and their phytotoxicity were observed. Interestingly, after treatment of plants with mixtures of oils, the duration of the protective effect after treatment of plants with mixtures of oils was ranged between 28 and 35 days. Essential oils with a pleasant smell mask the unpleasant smell of Azadirachta indica vegetable oil. The prospects of using in enclosed spaces a mixture of different oils that are not toxic to humans to protect plants from whiteflies are shown.