Efficacy Evaluation of insecticide spraying to control of Aedesaegypti of Local Administration

Abstract

This study aimed to evaluate an effectiveness of spraying mosquitoes control chemicals in three components, as Sprayer, spraying machines and chemicals, which operated by local government organizations in responsible area of Disease Prevention and Control 6 Khon Kaen province. One from all nine Provinces was selected purposively. Then, thirty five from All sixty seven local government organizations in sample province were randomized by simple random method.  For collection data, a regularly performance sprayer in each organization was interviewed with questionnaire and closely observed demonstration step of spraying activities, such as mixing chemicals and spraying. A performance of available sprayer machines were measured temperature values at nozzle, chemical liquid flow rate, and volume median diameter (VMD), according to guideline of the World Health Organization. Also, quality chemicals for spraying to control adult mosquitoes was tested Bioassay test precisely guidelines of the World Health Organization. Results were analyzed with descriptive statistics

          The study found that in case of performance of sprayer, All 42 sprayers are male, majority of them are temporary employee (69%)and nearly three in four have never been trained on how to use machines and chemicals(71.43%). A preparation and selection material skill, techniques and skills to mixing chemicals before spraying chemicals, ability to calculate properly a volume rate of fuel and chemicals of them were medium level. Mostly containers to mix the chemicals were fuel gallons (78.6%)and through a cone filter before filling the tank sprayers (88.1%).They correctly used personal protection equipment during spraying (85.7%) and demonstrated step of spraying activities (81.00%).Subsequently, performance of sprayer machines. All of the 79 machines were the rmalfrogging type. The Igebabr and was used mostly (63.3%). Others are the Best foger and the Swing fog percent (20.2% and 16.5% respectively). Nearly four in five of them had the temperature values at nozzle with the standard (600-800 c). However, there are only three in five getting the standard (10-30 microns) of volume median diameter (VMD) and also the standard of chemical liquid flow rate (21 liter/hour) as 60.76% and 60.76%). quality of chemicals, chemicals 12 brands were collected from 12 settings, those were synthetic pyrethroids and classified namely, six brands as Deltamethrin, five brand as Cypermethrin and one as Cyfluthrin. Testing quality of the compound according to the ratio specified in the label found to be effective to eliminate mosquitoeshighly. As well as, the mosquito mortality rate was 98% to 100%.

In conclusion, sprayers were temporary employee who has not been trained on the use of chemicals, spraying machines, spraying techniques, and also basic repairing machines. Moreover, they lack of related skills in practice. However, majority machines meet the standards based on guideline of the World Health Organization, namely temperature values at nozzle, insecticide flow rate, and volume median diameter (VMD). But a few sprayer and spraying machines of local government organizations did not stand up to standard. Chemicals were effective to control mosquitoes if making mixed appropriately following instruction yet. Otherwise, It occurs resistant to used chemicals in case of diseases control in area. Thus, In this area all sprayers should be trained particularly by related organization, such as the Department of Diseases Control, to provide related knowledge and skills for controlling mosquitos that be carriers’ diseases effectively. Also, spraying machines could be assessed standard following guideline regularly.