STUDIES ON EXTERMINATION OF ONCOMELANIA NOSOPHORA (ROBSON):(III) EXTERMINATION OF ONCOMELANIA NOSOPHORA BY MEANS OF SOIL-BURNING ELAME THROWER
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概要
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1. The extermination of Oncomelania nosophora (Robson) by means of a soil-burning flame thrower is a very effective method provided that the use and operation are appropriate. The standard method for ordinary geographical terrain is 4-minute buring per 5m<SUP>2</SUP>, promising termination of more than 80 per cent.<BR>If deposits and stones are not found in the area to be cleaned, 2-minute combustion per 5m<SUP>2</SUP> can provide a sufficient effect. On the other hand, when the area contains many stones destruction by fire for 6 minutes or more per 5m<SUP>2</SUP> is necessary. In the case of the area containing flowing water or swamp, the effect of this method is not promising at all.<BR>2. The destruction rate reaches its maximum on the third day after the soil burning.<BR>3. From the economic point of view, the performance of this method is comparatively expensive, therfore, it should be used as an adjunctive of other principal method of Oncomelania extermination.
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