Abstract
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 5m2, promising termination of more than 80 per cent.If deposits and stones are not found in the area to be cleaned, 2-minute combustion per 5m2 can provide a sufficient effect. On the other hand, when the area contains many stones destruction by fire for 6 minutes or more per 5m2 is necessary. In the case of the area containing flowing water or swamp, the effect of this method is not promising at all.2. The destruction rate reaches its maximum on the third day after the soil burning.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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