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Korean J Parasitol > Volume 30(4):1992 > Article

Original Article
Korean J Parasitol. 1992 Dec;30(4):329-340. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1992.30.4.329
Copyright © 1992 by The Korean Society for Parasitology
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)

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