Abstract: Pomacea canaliculata is one of the 100 most harmful invasive species in the world. However, efficient methods of killing the egg mass are not available up to now. In this study, different concentration of calcium chloride solution were used to kill the egg mass of P. canaliculata. The experiment results in laboratory showed that the death rate of the egg mass increased with the increasing of concentration of calcium chloride solution (Y=6.547 6X+6.785 7,df=8,r=0.958,p<0.001). When the calcium chloride solution concentrations reached 12 g/L, the egg mass death rate was up to 90%. In different times after applying calcium chloride solution, the egg mass were flushed by fresh water for 1 minute. The results showed that there was no significant difference between the flushing group and the no-flushing group. The results of the field experiments showed that the death rate of the egg mass increased with the increasing of concentration of calcium chloride solution too (Y= 1.523 8X+26.763, df=6, r=0.931 9, p<0.001). When the calcium chloride solution concentrations reached 40 g/L, the egg mass death rate was up to (93.33±2.89)%. All the results indicate that the calcium chloride solution can kill egg mass of P. canaliculata effectively, even in the rainy day. So, calcium chloride solution can be used to kill the egg mass of P. canaliculata.

Key words: calcium chloride, Pomacea canaliculata, egg mass, killing action