Aref Mohammed Ahmed Ali Al-hasani ^*(1)

(1) Department of Biology, College of Education Radfan, University of Aden, Khormaksar, Yemen.
(*Corresponding author: Dr. Aref Al-hasani. E-Mail: aref19402@gmail.com)

Received:9/10/2021             Accepted:23/1/2022

Abstract:

The study was conducted in the Department of Biology laboratory,Faculty of Education-Radfan – University of Aden, 2021 in order to test the aqueous extract (stalks) of the tobacco plant N. tabacuma at concentrations of 0.0, 0.1, 0.2, 0.4 and 1.0% with four replicates for each as a larvicide; For Cu. Pipiens L. The death rates calculated as %, after (2, 4, 8 and 24) hours, the results indicated that the used plant extract had good properties as a larvicide, and the results indicated significant differences at the 5% in the average killing rates for the first and fourth tested larvae, about 67.69% and 36.50%, respectively, the concentration of 1.0% achieved the highest values of 97.82% compared to 29.85% for the concentration of 0.1%. The results also showed that the average death rates % increase with increasing exposure time, reaching 69.50% over 24 hours and 36.63% over two hours. No death rates were recorded in the treatment of the witness control.
Keywords: Nicotiana tabacum L., powder, Culex pipiens L., aqueous extract

Full paper in Arabic: pdf