title: Control of snow pool mosquitoes with Bacillus thuringiensis serotype H-14 in mountain environments in California and Oregon.
abstract: Studies were conducted in mountainous areas of California and Oregon to test the effectiveness of Bacillus thuringiensis serotype H-14 in controlling larvae of snow pool Aedes mosquitoes, and also the effect of such larval control on the density of adult mosquitoes. California and Oregon studies showed that a wettable powder formulation of B.t.i. was effective in controlling mosquito larvae. In Oregon, treatment was effective even at water temperatures as low as 5 degrees C. Sampling of adult mosquitoes at campgrounds where intensive larval control was done failed to demonstrate a lowering of adult mosquito density in comparison with untreated control areas. Flight range studies showed that snow pool Aedes species can fly distances of up to 2 km, suggesting that infiltration from outside the treated area was one cause of failure. Inadequate seasonal timing appeared to be an additional factor. Using a simple computer model, we estimated that larval mosquito control with B.t.i. could be done for about $5,000 per season for a 500 ha area similar to our test area, a cost of $10 per ha ($4 per acre).
mesh_terms: D000330:Aedes; D000818:Animals; D001413:Bacillus thuringiensis / Q000472:pathogenicity*; D002140:California; D003198:Computer Simulation; D003365:Costs and Cost Analysis; D005069:Evaluation Studies as Topic; D005260:Female; D005426:Flight, Animal; D007814:Larva; D009922:Oregon; D010572:Pest Control, Biological / Q000379:methods*; D012703:Serotyping; D014867:Water
chemical_list: D014867:Water