Open AccessLARVICIDAL ACTIVITY OF LEAF EXTRACTS OF AGERATUM CONYZOIDES AND HYPTIS SUAVEOLENS AGAINST AEDES AEGYPTI
Author(s) -
Chude C.F,
Okorie C.J,
Ayegbunam E.S,
Aghalu U.C
Publication year - 2020
Publication title -
international journal of engineering applied science and technology
Language(s) - English
Resource type - Journals
ISSN - 2455-2143
DOI - 10.33564/ijeast.2020.v04i10.056
Subject(s) - ageratum conyzoides , traditional medicine , aedes aegypti , biology , medicinal plants , botany , medicine , weed , larva
Mosquito-borne diseases are the most significant public health risks globally. The potency of ethanolic leaf extracts of Goat weed (Ageratum conyzoides) and Pignut weed (Hyptis suaveolens) as mosquito larvicides under laboratory conditions were investigated. The leaf extracts of test plants were obtained using Soxhlet apparatus. Different test concentrations of 10, 8, 6, 4, 2, and 0 mg/ml (control) were prepared from stock solution. Twenty larvae of Aedes aegypti were exposed to various concentrations and observations were made for the period of 24 hour. The result indicates that the mean larval mortality of A. aegypti was recorded highest at concentration of 10 mg/ml (4.92±3.605) and (3.25±2.598) followed by 8 mg/ml (4.50±2.747) and (2.58±2.065) for leaf extracts of A. conyzoides and H. suaveolens respectively; hence, no mortality was recorded in the control. There was significant difference (p <0.05) between mortality caused by concentrations and control for both plant extracts. The mean larval mortality rate of A. aegypti was recorded highest at 3 hours (4.33±3.597) and (3.11±2.698) on exposure to A. conyzoides and H. suaveolens leaf extracts respectively. There was also significant difference (p <0.05) between the mortality recorded at various time of exposure. The percentage mortality was higher in leaf extracts of Ageratum conyzoides than Hyptis suaveolens but there was no significant difference (p >0.05) between the mean mortality of the two plants extracts. However, the LC50 value for A. conyzoides and H. suaveolens were found to be 4.30 mg/ml and 1.81 mg/ml respectively for acute 24 hours test. It was recommended that leaf extracts of both plants can be used as larvicides against these insect vectors of public health importance.