Efficacy of Dibrom((R)), Trumpet((R)), and Scourge((R)) against four mosquito species in Louisiana

Adult mortality of Anopheles quadrimaculatus, Culex quinquefasciatus, and t he Aedes spp. complex (Aedes sollicitans and Aedes taeniorhynchus) was obse rved after aerial ultra-low Volume (ULV) exposure to Dibrom(R), Trumpet(R), and Scourge(R). Dibrom was applied at 112 g active ingredient (AI)/ha, Tru mpet at 112 g AI/ha, and Scourge at 1.96 g AI/ha. At all time intervals, Di brom and Trumpet were significantly more effective against the Aedes spp. c omplex than against An. quadrimaculatus and Cx. quinquefasciatus. Scourge w as significantly more effective against An. quadrimaculatus and Cx. quinque fasciatus than Dibrom or Trumpet. Trumpet was evaluated at lower labeled ra tes (28, 56, and 84 g AI/ha) against Cx. quinquefasciatus and the Aedes spp . complex. Adult mortality with Trumpet increased significantly at 1 and 24 h against Cx, quinquefasciatus. With the Aedes spp. complex, mortality inc reased with rate at 1 h, but at 12 and 24 h, the medium and high dosages we re not significantly different from each other. Culex quinquefasciatus and the Aedes spp. complex were also subjected to ULV ground applications of Di brom, Trumpet, and Scourge. Dibrom was applied at 22.4 g AI/ha, Trumpet at 22.4 g AI/ha, and Scourge as a 1:6 mineral oil mixture at 1.96 g AI/ha. Rel ative to Dibrom and Trumpet, mortality from Scourge differed greatly with m osquito species. Against Cx. quinquefasciatus, Scourge was significantly mo re effective than Dibrom and Trumpet at all times and distances, but agains t the Aedes spp. complex Scourge was significantly less effective.