A Elangovan, G Veeraiyan, K Elumalai, M Prakash
larvicidal activity, plant oil formulation
A Elangovan, G Veeraiyan, K Elumalai, M Prakash. Larvicidal Activity Of Plant Oil Formulation Against Three Important Vector Mosquito Sp.. The Internet Journal of Veterinary Medicine. 2008 Volume 6 Number 1.
Over a last few decades, there has been increasing interest in isolating biological substances against various diseases. Of which mosquitoes plays a vital role in transmitting numerous diseases that are harmful to human being (malaria, filariasis and numerous viral diseases, such as dengue, Japanese encephalitis and yellow fever). Mosquitoes are also become increasingly resistant to traditional chemical pesticides and there is growing concern about the potential health and environmental risks surrounding these products. In order to overcome this, efforts have been taken to control the mosquito by using biological substances . In the present study plant oil formulation was used to control the mosquito larvae. The efficacy of different concentration of the plant oil formulation viz. 15.62, 31.25, 62.5, 125.0 and 250.0 ppm for their larvicidal activity against
Mosquitoes are important vectors of several tropical diseases, including malaria, filariasis, and numerous viral diseases, such as dengue, Japanese encephalitis and yellow fever. In countries with a temperate climate they are more important as nuisance pests than as vectors. (Jaswanth
One potential alternative approach to the use of chemical pesticides is the use plant secondary metabolites like active compounds and other volatile oils (Rihana, 1993). Recently natural products of plants are widely under investigation against insects due to their excellent properties like cheap availability and renewable nature, presence of an array of characters like insecticidal, antifeedant, ovicidal etc., and their environmental safety nature (Saxena and Thikku, 1988 and 1990). Earlier works of several authors revealed that botanicals can have strong larvicidal (Mwangi and Rembold (1988); Vasudevan
Materials And Methods
Larvicidal bioassay - Larvae of
Results And Discussion
The consequences of different concentrations of the POF viz. 15.62, 31.25, 62.5, 125.0 and 250.0 ppm on the larvicidal activity against
The effect of different concentration of the POF against
The efficacy of different concentrations of the POF viz. 15.62, 31.25, 62.5, 125.0 and 250.0 ppm on the larvicidal activity against
The results showed that the mortality of the larvae increased as the doses of the sample were increased. The same trend was observed among the three mosquito species. Further, it was observed that many larvae were failed to ecdyze to perfect pupae producing larval-pupal intermediate (Mwangi and Mukiama, 1988). These results are very promising in creating new effective and affordable approaches to the control of vector mosquitoes. It is interesting to note that, the following observations were made among the experimental larvae i.e., the sluggish movement and peculiar coiling of treated larvae seem to suggest some neutral or muscular disturbance by some active principle; which might be cause acute lethal effect these findings is in corroborate with the observation of Mwangi and Rembold (1988). The detail lethal effect of compound is more likely to be caused by a disturbance of the endocrine mechanism that regulate moulting and metamorphosis. This mechanism of action has been postulated previously for Neem Seed Kernel Extract (NSKE) by Zebitz (1986).