SR450 and Superhawk XP Applications of Bacillus Thuringiensis Israelensis Against Culex Quinquefasciatus
NAVY ENTOMOLOGY CENTER OF EXCELLENCE JACKSONVILLE NAS FL
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Sprayer comparisons and larval morality assays were conducted following SR450 backpack mist blower and Superhawk XP thermal fogger applications of Vectobacregistered trademark WDG Bacillus thuringiensis israelensis Bti against Culex quinquefasciatus. Bacillus thuringiensis israelensis was applied at maximum label rate in a 232.26-sq m field plot located in north-central Florida with containers placed at 2 heights ground level and 1.52 m above ground on stakes positioned 3.04, 6.09, 9.14, 12.19, and 15.24 m from the spray line. Results indicated that there was no significant P 0.05 difference in 24- and 48-h larval mortality between the 2 sprayers or between the 2 heights. There was significant difference P 0.05 among the 5 rows, with mortality continuously decreasing with increasing distance from sprayer. Both sprayers provided on average 70 larval mortality 3.04-9.14 m from the spray line, and 60 mortality at 12.19 and 15.24 m. The data suggest that the SR450 and Superhawk XP may be comparable sprayers for use with Bti to control mosquito larvae.