[Molluscicidal effect and cost-effectiveness of suspension concentrate of metaldehyde and niclosamide in the field in Honghu City].

OBJECTIVE

To assess the molluscicidal effect and cost-effectiveness of suspension concentrate of metaldehyde and niclosamide (MNSC) in the field, so as to evaluate the possibility of popularization and application value.

METHODS

26% MNSC and 50% wettable powder of niclosamide (WPN) were used for Oncomelania snail control with the spraying method in the field, and the 15-d molluscicidal effects and costs were investigated.

RESULTS

Fifteen days after the spraying, in the beach of Dongjing River, the snail death rates of MNSC and WPN were 89.40% and 88.08%, respectively, and the density reduction rates of MNSC and WPN were 92.35% and 91.67%, respectively. In the marshland of Honghu Lake, the snail death rates of MNSC and WPN were 86.59% and 87.01%, respectively, and the density reduction rates of MNSC and WPN were 90.05% and 91.71%, respectively. There was no significant difference in the molluscicidal effect between two drugs (P > 0.05). The cost of MNSC used in 100 m2 was 15.03 Yuan, while the cost of WPN used in 100 m2 was 16.29 Yuan.

CONCLUSION

MNSC has high molluscicidal efficacy, low cost and low impact on environments, which possesses of popularization and application value in the field.