title: Evaluation of three microbial formulations against Culex pipiens pipiens larvae in irrigation fields in Wroclaw, Poland.
abstract: Two evaluations of microbial mosquito larvicides were conducted in irrigation fields located along the Odra River near the city of Wroclaw, Poland. In the first evaluation, 3 dosages each of Bacillus thuringiensis israelensis (Bti)--VectoBac water dispersible granule (WDG) and VectoBac aqueous suspension formulation (12AS)--and Bacillus sphaericus (Bs)--VectoLex WDG--were tested against larvae of Culex pipiens pipiens. There was little difference between formulations and rates of application between day 2 and 7 following the treatment. VectoBac WDG at 300 g/ha resulted in 100% mortality of Cx. p. pipiens. Between 0.5 and 1 liter of VectoBac 12AS caused sufficient mortality for up to 7 days. The effective shortterm application rate of VectoLex WDG was found to be 400 g/ha. The above doses can be recommended for up to 7-day control in this habitat. In the second evaluation, using VectoBac WDG at 800 g/ha, the residual efficacies of 2 ground application methods, a knapsack sprayer configured for large droplet application and a motorized backpack blower configured for small droplet application, were compared. The results indicated no significant difference between the 2 application methods, but a significant long-term effect of VectoBac WDG was observed at the rate of 800 g/ha.
authors: University of Wroclaw, Institute of Genetics and Microbiology, Department of Microbial Ecology and Environmental Protection, Przybyszewskiego str. 63, 51-148 Wroclaw, Poland.
authors: Katarzyna
authors: K
authors: Rydzanicz
authors: Elzbieta
authors: E
authors: Lonc
authors: Dorota
authors: D
authors: Kiewra
authors: Peter
authors: P
authors: Dechant
authors: Steven
authors: S
authors: Krause
authors: Norbert
authors: N
authors: Becker
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis; D003465:Culex / Q000382:microbiology*; D005618:Fresh Water / Q000469:parasitology*; D007306:Insecticides; D007814:Larva / Q000382:microbiology; D009032:Mosquito Control / Q000379:methods*; D011044:Poland
chemical_list: D007306:Insecticides