The relative susceptibility of two field collections of Bulinus truncatus (Audouin) to trifenmorph

Chemical control of the intermediate hosts of schistosomiasis, based on copper sulphate, has been practised in the Sudan Gezira since 1956. A continued use of the more recent trifenmorph blanket-treatments raises the question of eventual resistance to this molluscicide. Two collections of Bulinus truncatus (Audouin), from a treated and an untreated area of the Gezira, have therefore been subjected to laboratory rearing, bioassay and measurement of the rate of uptake of the chemical into the snail. A difference in susceptibility could be shown and this has been tentatively attributed to the rather more marked difference, in penetration rate of the molluscicide, between the two groups of snails.

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