| macroconditions of channel segments utilized by culex pipiens pallens immatures in saga city, southwest japan. | the relation between macroconditions of water channels and the breeding of culex pipiens pallens in saga city were examined, based on weekly census data over 3 years for ca. 2,000 channel segments. mosquito breeding activity was greatest in channel segments between building lots and field lots in the suburban area. the segments involved ranged from narrow roadside ditches (width < 1 m) to wide irrigation canals (width > 10 m), all of which were utilized by mosquitoes. there was a weak tendency f ... | 1995 | 8825506 |
| physical and biological attributes of water channels utilized by culex pipiens pallens immatures in saga city, southwest japan. | physical and biological attributes of water channels utilized by immatures of culex pipiens pallens were studied in saga city, japan. water in mosquito-productive segments generally was stagnant or slowly running (mean < 5 cm/sec), with low and fluctuating dissolved oxygen concentrations and high electric conductivity. water flow > 20 cm/sec was considered necessary for prevention of mosquito breeding. the aquatic fauna in mosquito-productive segments was composed of taxa tolerable to polluted w ... | 1996 | 8827594 |
| possible culex pipiens pallens control by improvement of flow rates in water channels of saga city, southwest japan. | water levels and flow rates (no. censuses with flow/no. censuses per year) were analyzed for 208 mosquito-productive and 422 mosquito-free channel segments during 1986-88 in saga city, southwest japan. mean water levels tended to be higher at mosquito-free segments than at mosquito-productive segments, but the differences were < 5 cm and usually not significant. flow rates exceeded 80% at 60-67% of mosquito-free segments. in contrast, flow rates were < 20% at 49-62% of mosquito-productive segmen ... | 1996 | 9046470 |