author(s)
Mohamadou Sali Baïnang, Kouninki Habiba, and Nukenine Nchiwan Elias

abstract
The use of chemical insecticides in the fight against pests is a real threat to the environment and human health. Thus, insecticidal plants are therefore a serious alternative to cure this issue. In fact, the extracts (hexane, acetone, methanol) of Lippia rugosa were tested on the adults of Tribolium castaneum to evaluate their insecticidal potential. Toxicity and repellence test were made. These extracts induce mortality of adults of Tribolium castaneum varied significantly with doses and duration (P <0.001). After 72h of exposure only the hexane extract caused 100% mortality at the maximum dose. The mortality recorded by the acetone and methanol extract are respectively 87.50 ± 3.22% and 96.25 ± 2.39% at the highest dose. The repellence test revealed that all the extracts are repellent toward Tribolium castaneum with the repellency index of 50.62 ± 6.43% for acetone; 77.55 ± 4.26% for methanol and 90 ± 4.92% for hexane. The LD₅₀ values ​​at 72 hours were 1.63 g (acetone); 1.04 g (methanol) and 1.12 g (hexane). In general, the hexane extract of Lippia rugosa was more effective for both toxicity and repellency against the adult of Tribolium castaneum.