Evaluation de l'effet insecticide et l'allocation des biomarqueurs énergétique de la chenille processionnaire du pin (Thaumetopoea pityocampa Schiff) sous l'effet de trois huiles essentielles formulées

Abstract

Evaluation of Insecticidal effect and energy allocation of energy biomarkers of the pine processionary moth (Thaumetopoea pityocampa) Schiff. under the effect of three essential oils formulated (Thymus pallescens Noé., Artemisia herba alba Asso and Pinus halepensis Mill.) The pine processionary moth, (Thaumetopoea pityocampa Schiff.) the most important defoliator of pines in the Mediterranean region. Chemical pesticides are considered as effective solutions but the problems of the resistance of insects and their adaptive capabilities cause by the massive use of this chemical pesticides, which necessity to find new alternative product natural of plant origin against this insect’s attacks. Essential oils are the most products currently tested. This study showed on one hand the toxicity of three essential oils extracted of Thymus pallescens Noé., Artemisia herba alba Asso and Pinus halepensis Mill. on the L2 and L3 larvae of the processionary caterpillar Aleppo pine (Thaumetopoea pityocampa Schiff.) In order to search for new bioactive natural products, on the other hand we realize a dosage series of energy reserves in order to know the response of the processionary Caterpillar against this stress condition cause by those essential oils. The results obtained showed Differentiated efficacy of the three essential oils on both L2 and L3, cette efficiency is estimated by the mortality of their invidious in addition, this mortality Increase proportionally with the rise of the Dose and exposure time. The results revealed that essential oils of thyme is the most efficacies effective against oil all of the population of both L2 and L3. The study on energy reserves has showed the prevalence of the fats as a biomarker, because is considering as the most responsive biological parameters, to use it for the reproduction process.