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Korean J Parasitol > Volume 34(1):1996 > Article

Original Article
Korean J Parasitol. 1996 Mar;34(1):27-33. Korean.
Published online Mar 20, 1996.  http://dx.doi.org/10.3347/kjp.1996.34.1.27
Copyright © 1996 by The Korean Society for Parasitology
Population density of chigger mites, the vector of tsutsugamushi disease in Chollanam-do, Korea
Hyun-Jae Song,1Kai-Hoan Kim,1Soon-Chun Kim,1Sug-Soon Hong,1 and Han-Il Ree*2
1Division of Microbiology, Health and Environment Institute of Chollanam-do, Kwang-ju 502-201, Korea.
2Department of Parasitology, Yonsei University College of Medicine, Seoul 120-752, Korea.
Received October 12, 1995; Accepted January 13, 1996.

Abstract

The geographical distribution and population density of rodents and chigger mites at six localities of Chollanam-do were investigated from October to December in 1993. Among total 142 field rodents collected by the modified Chemla wooden traps, 131 rodents were Apodemus agrarius (92.3%) and 11 were Crocidura lasiura (7.7%). Out of 142 field rodents, 92 were parasitized by chiggers, showing 69.0% of the infestation rate and 74.2 of the chigger index. Infestation rate and chigger index of A. agrarius and C. lasiura were 73.3%, 80.4 and 18.2%, 0.5, respectively. From the trapped field rodents, 10,532 chiggers were collected and identified with 11 species of 4 genera. Leptotrombidium pallidum, the vector species of tsutsugamushi disease, was the dominant species, showing 8,038 chiggers (76.3%). L. scutellare was the second dominant species showing 1,359 chiggers (12.9%). The distribution of chigger mites was clearly localized by the species, showing the different dominant species according to localities. The predominant species was L. scutellare (100%) in Changhung-gun, L. scutellare (41.5%) in Posong- gun, L. pallidum (88.8%) in Hwasun-gun, L. pallidum (59.2%) in Koksong- gun, L. zetum (77.3%) in Hampyong-gun, and L. palpale (63.4%) in Tamyang-gun. Regarding to the geographical distribution of chigger population density, the infestation rate and chigger index was most high in Hwasun-gun as 62.4% and 216.2 respectively, and next high in Koksong-gun as 22.4% and 77.7% respectively.

Figures


Fig. 1
Relative abundance to chigger mite species collected at six localities of Chollanam-do during October through December in 1993. Locality* 1, Changhung, Changhung-gun; 2, Boknae, Posong-gun;3 , Neungju, Hwasun-gun; 4, Samgi, Koksong-gun; 5, Walya, Hampyong-gun; 6, Tamyang, Tamyang-gun.

Tables


Table 1
Collections of field rodents in Chollanam-do during October through December in 1993


Table 2
Number of chigger mites collected from field rodents by different of Chollanam-do during October through December in 1993


Table 3
Number of the chigger mites by species collected in Chollanam-do during October through December in 1993


Table 4
Comparison of the chigger indice at different localities of Chollanam-do during October through December in 1993

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