Molluscicidal Effect of Eco-Friendly Agricultural Substances for Controlling Golden Apple Snails (Pomacea canaliculata, Lamarck)

The golden apple snail ( Pomacea canaliculata ) has been utilized as a natural and eco-friendly control of weeds in rice paddy fields. However, P. canaliculata can damage other crops. In this study, the effectiveness of plant extracts from various natural sources that are reportedly effective against pests in the control of P. canaliculata was investigated. The four plant extracts were effective against P. canaliculata and ranked in descending order as green tea seed ( Camellia sinensis ) > root of red spider lily ( Lyc-oris radiata ) > leaves of tobacco ( Nicotiana tabacum ) > root of sophora ( Sophora flavescens ). The mortality rate of P. canaliculata was increased using 200 to 2000 mg/kg of green tea seed powder. However, shrubby sophora root extract did not significantly increase the mortality rate. The LC 50 and LC 90 of green tea seed, tobacco leaves, shrubby sophora root, and red spider lily root were 900 and 2800 mg/L, 956 and 2320 mg/L, 2162 and 5325 mg/L, and 512 and 1054 mg/kg, respectively. The LC 50 and LC 90 of ground powder of C. sinensis , N. tabacum , S. flavescens