Insecticidal Properties and Chemical Composition of Conyza Aegyptiaca (L.) Oil: Studies on Two Dipterous Insect Pests

Abstract

Abstract:The herb, Conyza aegyptiaca L., was subjected to hydrodistillation process to extract the essential oil from the whole dry plant material. Larvae and adult stages of the mosquito, Anopheles pharoensis, and the housefly, Musca domestica, were used as test model organisms representing two dipterous insect pests of medical importance. Under standard bioassay test methods, the LC50 of the oil accounted to 37.8 ppm and 0.087 mg/cm 2 against larvae and adults of An. pharoensis, respectively. These toxicity parameters were found to be 71.8 ppm as LC50 and 0.125 µg/insect as LD50 against larvae and adults of M. domestica, respectively. Using GC/MS analysis, we identified 19 compounds constituting ca. 97% of phytochemicals present in the oil, such as monoterpenes, sesquiterpenes and esters. Limonene constituted about 50% of the plant oil (48.79%), followed by (E) -β-Ocimene (8.66%), Germacrene D (7.54%) and β-pinene (6.91%). The occurrence of the other constituents ranged between 0.27% and 5.29%. It was concluded that the potency of C. aegyptiaca oil refers mainly to the presence of limonene. The findings of this study may encourage more research aiming at investigation of eco-friendly biopesticides based on botanical resources.

Musca domestica laboratory susceptibility to three ethnobotanical culinary plants

“…Larvicidal bioassay was done in accordance to Mansour and Mohamed (2013) using 20 larvae in the presence of 100 g of semisynthetic diet (described above) with 50 ml water containing the tested concentrations of the extracts (0.5, 1, 2, 3 g/ L). Mortality was recorded at 24, 48, and 72 h after treatment during which any change in mobility and appearance of larvae was noted down.…”

Neuroprotective activity of Conyza aegyptiaca hydroethanolic extract against ethanol-induced neurodegeneration in adolescent Wistar rats brain

“…In Togo, a large part of the population continues to use plants remedies for their primary healthcare (Kpodar et al, 2016), including the management of central nervous system disorders (Kantati et al, 2016). Conyza aegyptiaca is one of these medicinal plants of Togolese flora, whose scientific studies have revealed its antioxidant potential through its antimicrobial (Anani et al, 2000), antihypertensive and cardioprotective (Kpegba et al, 2011), antimalarials and insecticides (Mansour and Mohamed, 2013), and antihyperglycemic's properties (Akakpo et al, 2016(Akakpo et al, , 2017. However, none of these scientific studies have focused on its neuroactive potential.…”

The Toxic Spectrum of Ricinus Communisand Zingiber Officinalis Essential Oils against Musca Domestica L.

“…Many studies revealed satisfactory results from the use of several essential oils for the house fly M. domestica management (Abdel Halim and Morsy, 2005;Sinthusiri and Soonwera, 2013;Pinto et al, 2015). In addition, the synergistic action of essential oils with conventional chemical pesticide previously studied (Mansour and Mohamed, 2013).…”