福寿螺对不同品种直播稻苗的取食为害特性OA

[Purpose]This study aimed to investigate the feeding and damage characteristics of Pomacea canaliculata on direct-seeded rice seedlings of different varieties,and to provide a theoretical basis for effective control of P.canaliculata in direct-seeding rice fields.[Method]Laboratory experiments were conducted to examine the feeding and damage behavior of different sizes of P.canaliculata—small snails(0.51 g),medium snails(4.37 g),and large snails(7.82 g)—on direct-seeded rice seedlings of three varieties,Yongyou 1540(indica-japonica hybrid),Xiushui 134(japonica),and Zhongzao 39(indica).[Result]The damage period caused by small snails to direct-seeded rice seedlings of different varieties was 7 days,with the peak damage occurring 1-4 days after seeding.For medium and large snails,the damage period lasted about 21 days,with the peak occurring 1-10 days after seeding.The daily damage rates caused by small,medium,and large snails reached 1.9-2.6,9.2-12.1,and 16.2-23.1 seedlings per day,respectively.The feeding amount of large snails was 22.3-30.1 times that of small snails and 1.7-1.9 times that of medium snails,while the feeding amount of medium snails was 11.5-18.3 times that of small snails.[Conclusion]Pomacea canaliculata caused damage to direct-seeded rice seedlings for approximately 21 days,with the peak damage occurring within 10 days after seeding.Small snails caused relatively minor harm,whereas medium and large snails were the main damaging agents.Feeding damage by P.canaliculata was highest on indica rice,followed by indica-japonica hybrid rice,and lowest on japonica rice.Based on these feeding and damage characteristics,targeted control measures against P.canaliculata are proposed.