Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81
Warning: fopen(upload/ip_log/ip_log_2024-11.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83
Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84 Epidemio-entomological survey on malarial vector mosquitoes in Kyongbuk, Korea
Epidemio-entomological survey on malarial vector mosquitoes in Kyongbuk, Korea
C Y Joo and G T Kang
Department of Parasitology, School of Medicine, Keimyung University, Taegu 700-310, Korea.
Abstract
In order to determine population dynamics of Anopheles sinensis, a survey based on average number of female mosquitoes per trap-night was carried out during the period of 5 years from 1987 to 1991. A. sinensis first appeared between the 2nd and 20th April, and were trapped in large number between the 5th and 12th July. The number of trapped mosquitoes began to decrease from mid-August, and a few were collected until mid-November, each year. The average number of A. sinensis in July was 542.6 per trap-night in 1987, but in 1989 increased abruptly to 1,331.4, and then decreased to considerably lower levels, 271.9 in 1990 and 372.1 in 1991. The nocturnal activity of A. sinensis to attack humans was found to become active in the early night, and it was gradually decreasing at mid-night, however, then slightly increasing toward dawn. The immature stage of A. sinensis in the rice paddies was first found in the correlation pattern with peak adult densities in early July. The highest larval density of A. sinensis in the study area was 21,226 × 103 in early July 1990. The larval A. sinensis showed high resistance level and resistance ratios against 3 kinds of organo-phosphorous compounds, diazinon, malathion, and fenitrothion, but low resistance against fenthion. The present results indicated that the population density of A. sinensis in Kyongbuk area is decreasing over the five-year from 1987 to 1991.
Figures
Fig. 1 Surveyed areas (O) in Kyongbuk Province, Korea.
Fig. 2 Annual prevalence of Anopheles sinensis as shown in MPI calculated from the data of posquito collection at 3 stations.
Tables
Table 1 Five Years' observations of the earliest dates Anopheles sinensis begin to appear in Kyungsan-gum Kyongbuk Province, Korea, together with meteorological data
Table 2 Dates of peak population of Anopheles sinensis and meteorological data at that time
Table 3 Dates of disappearance of Anopheles sinensis and meteorological data
Table 4 Seasonal prevalence of Anopheles sinensis by the average number collected each traps during 5 years
Table 5 Relative abundance of Anopheles sinensis population in successive years after 1987
Table 6 Comparison of total and engorged number of Anopheles sinensis collected by light traps at piggery A, cow-stall B, and house-dwelling C during five years, 1987~1991
Table 7 Monthly fluctuation of total and engorged number of Anopheles sinensis collected by light trap(1987-1991)
Table 8 The results of overnight Anopheles sinensis collection by light trap in a pigsty and on human baits(1990)
Table 9 Age composition of Anopheles sinensis collected in 1990 as determined by the number of follicular relics
Table 10 Age structure of immature stages of Anopheles sinensis in the study area (1989-1991)
Table 11 Resistance levels and resistance ratio of larval Anopheles sinensis for tested insecticides(1990)
References
1.
Baik DH, Joo CY. Epidemio-entomological survey of Japanese encephalitis in Korea. Korean J Parasitol 1991;29(1):67–85.
2.
Chandler JA, Highton RB. Breeding of Anopheles gambiae Giles (Diptera: Culicidae) in rice fields in the Kisumu area of Kenya. J Med Entomol 1976;13(2):211–215.
3.
Ham KS. Korean J Publ Hlth 1970;7:553–563.
4.
Joo CY, Wada Y. Seasonal prevalence of the vector mosquitoes of Japanese encephalitis virus in Kyungpook Province, Korea. Korean J Parasitol 1985;23(1):139–150.
5.
Kobayashi H. Mansen no Ikai 1929;94:31–41.
6.
Lee DY, et al. Korean J Int Med 1988;34:660–665.
7.
Lee HI, Choi DW, Baik DH, Joo CY. Epidemiological studies on malayan filariasis in an inland area in Kyungpook, Korea 3. Ecological survey of vector mosquitoes of Brugia malayi. Korean J Parasitol 1986;24(1):15–24.
8.
Lee JG, et al. Korean J Rural Med 1990;15:130–133.
9.
Lee KW. [Insecticide tests for resistance on adults of Anopheles sinensis and Culex tritaeniorhynchus in Korea]. Korean J Parasitol 1969;7(1):29–31.
10.
Maeda O, et al. Jap J Med Sci Biol 1978;31:27–37.
11.
Otsuru M. Nissin Igaku 1949;38:339–347.
12.
Paik YH, et al. New Med J 1963;6:189–195.
13.
Ree HI, Hong HK, Paik YH. [Study on natural infection of Plasmodium vivax in Anopheles sinensis in Korea]. Korean J Parasitol 1967;5(1):3–4.
14.
Ree HI, et al. Rep NIH Korea 1979;16:311–316.
15.
Self LS, et al. Trop Med 1973;15:177–188.
16.
Seo BS, et al. Theses Collection Seoul Nat Univ 1959;8:213–220.
17.
Service MW. Mortalities of the immature stages of species B of the Anopheles gambiae complex in Kenya: comparison between rice fields and temporary pools, identification of predators, and effects of insecticidal spraying. J Med Entomol 1977;13(4-5):535–545.
18.
Sho CT, et al. Yonsei Rep Trop Med 1985;16:11–18.
19.
Wada Y, et al. Trop Med 1974;16:35–40.
20.
Whang CH. Yonsei Med J 1962;3:39–50.
21.
Whang CH. Yonsei Med J 1963;4:51–57.
22.
Yanada M. Keijo J Med 1936;7:191–210.
23.
Yasutomi K, et al. Jap J Sanit Zoo 1986;37:357–362.
24.
Yasutomi K, Takahashi M. Insecticidal resistance of Culex tritaeniorhynchus (Diptera: Culicidae) in Japan: a country-wide survey of resistance to insecticides. J Med Entomol 1987;24(6):604–608.
PDF Links
Full text via DOI
Download Citation 
