Laboratory Tests on the Rapidity of Molluscacidal Action of Copper Sulfate in High Concentration

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Abstract
Under conditions considered optimum for maximal toxic action, Cu sulfate at 20 ppm. did not kill Australorbis glabratus and Biomphalaria boissyi within contact periods of 1 through 5 hours. Based on subsequent death of the snails in fresh water, the percentages of mortality for each hour of exposure from 1 through 5 were: A. glabratus. 55, 85, 90, 93, 95; B. boissyi. 58, 78, 58, 75, 65. Bulinus contortus snails were more susceptible to the Cu than the other spp. They survived the 1- and 2-hour contact periods, but the majority of them died within 24 hours following their removal into fresh water. Dead snails were observed in increasing numbers at the end of each additional hour of exposure from 3 through 5 hours, and the snails that survived these exposures all died within the following 24 or 48 hours.