Vol. 6, Issue 4 (2018)
Evaluation insecticidal potential of methanolic extracts of Senna occidentalis Link (1829) and Tithonia diversifolia (Hemsl) A Gray (1883) on the termite Ancistrotermes
Author(s): Siapo Yao Martin, Tahiri Annick, Diby Yao Kan Séraphin, Ano Ehui Joachim
Abstract: By biological tests, this study has shown laboratory the insecticidal effects of methanolic extract of S. occidentalis and T. diversifolia in the fight against pests termites. It spring that both plant extracts significantly reduced termite survival compared to witnesses. Fifty percent (50%) of insect mortality is obtained after 48 hours. These extracts cause total mortality of termites between 96 and 120 hours. The persistence of efficacy of these extracts in laboratory is 72 to 96 hours. The T. diversifolia extract is the most toxic (LD50 = 29.76 mg/l against LD50 = 84.9 mg /l in S. occidentalis). Contact and inhalation are the two essential paths their effectiveness on Ancistrotermes. S. occidentalis and T. diversifolia extracts do not act by ingestion and seems to have an anti-appetent effect on termites. These promising results suggest this extracts could as an alternative to chemicals.