Étude de l’activité insecticide de l’extrait et l’huile essentielle de Mentha rotundifolia vis-à-vis des larves de Tuta absoluta

Abstract

The tomato leaf miner Tuta.absoluta is a major pest of tomatoes in Algeria. Since its propagation, chemical control was the main control method because of the drawbacks of its insecticides, this study aims to propose alternative solutions based on the use of natural products (Bio-insecticide) for the control of tomato leafminer. T absoluta (Meyrk). Which is considered a serious threat to tomato production in Algeria and around the world. To meet this objective we evaluated the toxicity of the hydroalcoholic extract and the essential oil of M_rotundifolia on larvae of different stages of T.absoluta (L1_L2_L3_L4) the biological tests were carried out in vitro in petri dishes of 9cm in diameter. The determination of the lethal doses 50 and 90 (LD50 and LD90) of the extract and the essential oil was carried out the values LD50 and LD 90 are respectively 4.13 % and 2.53% of hydroalcoholic extract and 5.86 % and 5.21 % of the essential oil, calculated after an exposure of 7 days confirm the degree of toxicity of the essential oil and the extract of M.rotundifolia against the larvae of T.absoluta. The role of essential oils and hydroalcoholic extracts in the fight against tomato leafminer and discussed