Epidemio-entomological Surveys in Vector Mosquitoes of Japanese Encephalitis in Kyongbuk, Korea*
- Alternative Author(s)
- Joo, Chong Yoon
- Publication Year
- Culex tritaeniorhynchus; Horizontal life table; Japanese
encephalitis; Kyongbuk Province; Light trap; Population
dynamics; Seasonal prevalence; Vector mosquito
- The seasonal prevalence and population dynamic of Culex
tritaeniorhynchus (Cx. tritaeniorhynchus) in relation to the epidemic of Japanese
encephalitis, and the epidemio-entomological surveys of this vector mosquito in
Kyongbuk Province, Korea were made during the period of 15 years spanruing
from 1984 to 1998. As in the general patterns of seasonal prevalence, Cx.
tritaeniorhynchus was first collected between early and late June, and peaks in
the population densities of Cx. tritaeniorhynchus, occurred during the period from
late July in 1987 and 1994, early- to late-August in 1984-1986, 1990-1993 and
1995, and early- and mid-September in 1988, 1989 and 1996-1998. they showed
a simple sharply pointed one-peak curve. There was a gradual decrease from mid-
September, accompanied by with a very small number of them collected until late
October or early November in every year, except 1990.
Cx. tritaeniorhynchus with nocturnal biting habits had two peaks in their daily
activities, one soon after the sunset and the other during a few hours' period from
2-3 o'clock, although the relative numbers collected varied and the highest peak
collection occurred at different time in a night. The total number of larval Cx.
tritaeniorhynchus in rice fields was the highest in mid-August, and its number
progressively decreased in early September due to insecticides sprays. After late
September, the larvae was rarely found until rice plants were harvested. The
larval Cx. tritaeniorhynchus showed high resistance against five organophosphorus
compounds. In the adult horizontal life table characteristics of Kyongsan colonies
of Cx. tritaeniorhynchus under insectary conditions, life expectancy was 28.3 days
for males and 59.8 days for females. The net reproductive rate was 7.8 days, and
generation time was 25.6 days.
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