LARVICIDAL POTENTIAL AND MOSQUITO REPELLENT ACTIVITY OF CASSIA MIMOSOIDES EXTRACTS.

Area of Science:

• Ethnobotany
• Medical Entomology
• Natural Product Chemistry

Background:

• Malaria remains a significant global health threat, necessitating novel vector control strategies.
• The need for eco-friendly alternatives to synthetic pesticides in mosquito control is growing.
• Cassia mimosoides is traditionally used, prompting investigation into its insecticidal properties.

Purpose of the Study:

• To assess the larvicidal efficacy of Cassia mimosoides extracts against Anopheles gambiae larvae.
• To evaluate the repellent activity of a Cassia mimosoides extract formulation against adult Anopheles gambiae.
• To determine the phytochemical profile of Cassia mimosoides extracts.

Main Methods:

• Larvicidal assays were performed using petroleum spirit, ethanol, water, and dichloromethane extracts against Anopheles gambiae larvae.
• A petroleum ether extract was formulated into an aqueous cream base for repellency testing.
• Repellency was assessed using N-N-diethyl-m-toluamide (DEET) as a positive control.

Main Results:

• Petroleum ether and dichloromethane extracts achieved 100% larval mortality at 2 mg/ml.
• Larvicidal activity followed the order: petroleum ether > dichloromethane > ethanol > water.
• The cream formulation exhibited 100% repellency against mosquitoes, with activity correlating to extract concentration.

Conclusions:

• Crude extracts of Cassia mimosoides possess significant larvicidal and repellent properties against Anopheles gambiae.
• Cassia mimosoides holds potential for development into environmentally friendly larvicides and mosquito repellents.
• Further research into the specific bioactive compounds within Cassia mimosoides is warranted.