Evaluation of Bacillus sphaericus against Mansonia dyari larvae in phosphate lakes in Polk County, Florida.

Effective Mansonia larval control is difficult to achieve in Polk County, Florida, because the larvae attach to the root and stem mass of water lettuce (Pistia stratiotes) and water hyacinth (Eichhornia crassipes). This study evaluated 2 Bacillus sphaericus larvicides as possible control products in 3 phosphate lakes in 2 areas maintained by Polk County Mosquito Control. VectoLex WDG was applied at 56 kg/km2 and 170 kg/km2 and VectoLex CG at 560 kg/km2 and 1,100 kg/km2.

Evaluation of temephos formulations against Aedes taeniorhynchus larvae.

Four commercially available temephos formulations (Abate 4E, Clarke 1% Skeeter Abate [1% SA], Abate 2-BG, and Abate 5-BG) were evaluated against 3rd instars of Aedes taeniorhynchus in laboratory beaker tests and small field test plots. Abate 4E liquid formulation was effective in both the laboratory and plot tests. 1% SA and Abate 5-BG were more effective in the small field test plots than Abate 2-BG.

Operational studies with Valent VectoLex WDG, Bacillus sphaericus, in three Florida Mosquito Control Districts.

VectoLex WDG, Bacillus sphaericus (Valent BioSciences Corporation), was evaluated in 3 Florida Mosquito Control Districts under operational conditions. Application rates were 0.5 and 1.