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KMID : 0311219750060010003
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Yonsei Reports on Tropical Medicine
1975 Volume.6 No. 1 p.3 ~ p.14
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Resistance of Free-living Stages of Soil-transmitted Parasites to Pesticides
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Soh, Chin-Thack/áÌòåöý
Lee, Keun-Tae/Cho, Kee-Mok/Ahn, Yung-Kyum/Kim, Sang-June/Chung, Pyung-Rim/Im, Kyung-Il/ì°ÐÆ÷Á/ðáÐñÙÏ/äÌç¶ÌÅ/ÑÑßÓý/ï÷øÀ×ù/ìòÌ×ìé
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Abstract
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Lethal action of pesticides, which are used in present day Korea, to free living stages of hookworm, Trichostrongylus, Ascaris, Trichuris and cyst of Entamoeba histolytica was examined. The pesticides were bactericides (Captan, Polyramcombi), insecticides (Diazinon, B. T. C. and llepta), and herbicides (Simazin, P. C. P. ). The concentration of the pesticides was prepared on the basis of practical application in field. The routine period of exposure was 24 hours, and the results are briefly summarized as below;
Captan (1 : 400) : No lethal action to the eggs tested was confirmed. Hookworm eggs only were destroyed within 24 hours at the 2-fold concentration. Eutanzoeba histolytica cysts were destroyed within 6 hours.
Polyramcombi (1 : 800) : No significant lethal action was appeared to eggs and larave, and cysts of E. histolytica.
Diazinon (1 : 800) : No lethal action to the eggs tested was confirmed. Hookworm eggs only were destroyed within 24 hours at the 2-fold concentration. The rhabditoid larvae of hookworm were killed within 12 hours, and cysts of E. histolytica within one hour.
B. T. C. (30mg/50§²) : No lethal effect was confirmed to eggs, and cysts of E. histolytica tested. Hookworm eggs were destroyed at the 2-fold concentration within 24 hours. Hookworm rhabditoid larvae were killed within 12 hours, but the filariform larvae survived 56% at the same period.
Hepta (30mg/50§²) : No lethal effect was proved to eggs, and cysts of E. histolytica tested. Rhabditoid larvae of Trichostrongylus were destroyed within 12 hours.
Simazin (0. 5mg/50§²) : No lethal effect was proved to eggs, and cysts of E. histolytica tested. Filariform larvae of Trichostrongylus only were destroyed within 12 hours.
P. C. P. (5mg/50§²) : No. lethal effect was proved to eggs, but hookworm eggs were destroyed within 24 hours at the 2-fold concentration. The rhabditoid larvae of hookworm were destroyed within 24 hours, and the filariform larvae within 48 hours. The rhabditoid and filariform larvae of Trichostrongylus were killed within 6 hours. Cysts of E. histolytica were destroyed within 3 hours.
The overall results indicate that the conventional pesticides show no significant lethal effect to the eggs of hookworm, Trichostrongylus, Ascaris and Trichuris. But the larval forms specially the rhabditoid forms of hookworm and Trichostrongylus, will be destroyed either by Diazinon, B. T. C. , P. C. P. and Simazin at the ordinary concentrations of the field application. Entamoeba histolytica cysts also will be destroyed by Captan, Diazinon and P. C. P. within 1?6 hours.
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