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Thaumetopoea wilkinsoni  Tams. is the most important pine defoliator in the Mediterranean Basin and can cause serious growth losses on trees. At this point, the purpose of this study was to investigate the larvicidal effects of eight plant essential oils as biological control agents for the pine processionary moth. For this purpose,  Artemisia vulgaris  L.,  Juniperus drupacea  Labill.,  Melissa officinalis  L.,  Ocimum basilicum  L.,  Origanum majorana  L.,  Rosmarinus officinalis  L.,  Sideritis leptoclada  O. Schwarz &amp; P.H. Davis and  Vitex agnus-castus  L. essential oils were tested on the fourth/fifth larval periods of  T. wilkinsoni . The essential oils from the eight plants were obtained by hydrodistillation and analysed by GC/MS. The most abundant compounds from each studied species were as follows: 1,8-cineole (20.68%) for  R. officinalis , β-pinene (26.73%) for  S. leptoclada , linalool (38.67%) for  O. majorana ,  p -mentha-1,5-dien-8-ol (36.44%) for  M. officinalis , eugenol acetate (38.78%) for  O. basilicum , 1,8-cineole (22.10%) for  V. agnus-castus , d-limonene (45.21%) for  J. drupacea  and  trans -β-caryophyllene (21.22%) for  A. vulgaris . The results show that all eight essential oils exhibited promising efficacy in a dose-dependent manner on  T. wilkinsoni  larvae after 24 hours. The highest larvicidal effect was obtained from  J. drupacea , followed by  O. basilicum , with LC 50  values of 73.55 and 95.04 ppm, respectively. The data obtained from this study clearly indicate that  J. drupacea  and  O. basilicum  essential oils have the potential to have larvicidal effects and these findings point to the possibility of using the essential oil of the current species to control  T. wilkinsoni .

journal of essential oil bearing plants

Screening of larvicidal activities of eight plant essential oils against  Thaumetopoea wilkinsoni  Tams. (Lepidoptera: Thaumetopoeidae), a main pine defoliator in the Mediterranean