EVALUATION OF AERIAL SPRAY TECHNOLOGIES FOR ADULT MOSQUITO CONTROL APPLICATIONS

摘要

Spray droplet size has long been recognized as an important variable that applicators of vector control sprays must be aware of to make the most effective spray applications. Researchers and applicators have several different techniques available to assess spray droplet size from spray nozzles. The objective of this study was to compare the droplet size spectrum produced by three nozzles commonly used in vector control in a high-speed wind tunnel, when characterized using three different laser-baseddroplet size measurement systems.Three droplet sizing systems: Malvern Spraytcc laser diffraction, Sympatec HELOS laser diffraction, and TS1 Phase Doppler Particle Analyzer (PDPA), were simultaneously operated, but under different operating conditions, to measure the spray droplet size-spectra for three spray nozzles. The three atomizers: a Teejetr 8001E even flat fan nozzle, a BETEr PJ high pressure fog nozzles, and a Micro-nairr AU5000 rotary atomizer were evaluated in a high speed wind tunnel at airspeeds of 53 and 62 m/s (120 and 140 mph). Based on the results of this work, only the BETEr PJ high pressure fog nozzles met the label requirements for both Fyfanonr and Anvilr. While the other nozzle might met the Dv()5 (VMD - volume median diameter) requirement for Fyfanonr, the resulting D_(v0.9) values exceeded labeled size restrictions. When applying Anvil with the BETE PJ high pressure fog nozzles, it is important to use the smaller two orifice sizes. The larger sizes tended to result in D_(v0.9) values that exceeded label recommendations.