Determination of Mortality Effect of some Biological Larvicites on the Mosquito Culex sp.

HIGHLIGHTS

• Bacillus thrungiensis var. israilensis.causes mortality of Culex sp. larvae.

• Spinosad causes mortality of Culex sp. larvae.

• Bio-larvicides were an effective controlling tool for mosquitoes in Kahramanmars.

Abstract

The use of biocidal larvicides in the control against mosquitoes is important in reducing the adverse effects on non-target organisms and the environment. In this study, it was aimed to determine the most effective concentrations and durations of Bacillus thrungiensis var. israilensis and spinosad larvicides for controlling of the Culex sp. larvae collected from Kahramanmaraş region. For this pupose, Culex sp. larvae were exposed to Bacillus thrungiensis var. israilensis at the concentrations of 0, 0.025, 0.05, 0.1, 0.2, 0.5, 1.0, ve 2.0 µL/200 cm² and exposed to spinosad at the concentrations of 0, 0.0075, 0.015, 0.03, 0.06, 0.15, 0.3, ve 0.6 µL /200 cm² along 5 different times (3, 6, 12, 18 and 24 hours). According to the results of the variance and probit analysis, over 90% of mosquito larvae were observed to have died in almost all of the trial periods, but more than 90% of the larvae were found to have died considerably even1/10(For Bti:1 µL/200cm², For Spinosad:0.3 µL/ 200cm²) concentration after 24 hours which is recommended concentration. The results of the study showed that both bio-larvicides used gave similar results and were an effective controlling tool for mosquitoes. For this reason, it is important to use any of the two larvicides in consideration of local conditions and non-target organisms. For the observation of environmental health and mosquito resistance, making such studies at certain intervals is extremely important in terms of effective control with mosquitoes.

Keywords:
Biological larvicide; Culex sp; Mortality