Granule formulations of molluscicides for use in developing countries

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Abstract
Granule formulations of molluscicides may be superior to conventional sprays in many situations but they are not available commercially. Methods are described for making granules using Bayluscide® 70% wettable powder mixed with gelatin, wheat-flour or sand. In the laboratory all three types produced rapid mortality of Biomphalaria glabrata at application rates equivalent to 1 mg active ingredient per litre. Field trials were conducted with wheat-flour and sand-granules containing 5% clonitralide, and both were effective in marshes, seepages and ditches at less cost than conventional sprays. Lower cost and simplicity of manufacture make sand-granules the first choice for general use but hardened gelatin-granules may be useful if residual properties can be exploited.

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