Studies on Life Cycle of Rice Leaf Beetle (Oulema oryzae KUWAYAMA) and Control Method

벼잎벌레 생태(生態)와 피해해석(被害解析) 및 방제(防除)에 관(關)한 연구(硏究)

  • Yu, B.J. (Gangweon Provincial Office of Rural Development) ;
  • Kim, C.O. (Gangweon Provincial Office of Rural Development) ;
  • Chung, S.M. (Gangweon Provincial Office of Rural Development) ;
  • Park, Y.S. (Gangweon Provincial Office of Rural Development) ;
  • Huh, B.L. (Gangweon Provincial Office of Rural Development)
  • Published : 1985.04.30

Abstract

Experiments were carried out to investigate the life cycle of the rice leaf beetle (RLB), (Oulema oryzae KUWAYAMA) ,yield losses by its damages, and control method in $1976{\sim}1983$ at the experimental field of Gangweon PORD. Peak occurrence of adult and larva rice beetle was late May and mid-June, respectively. Adult overwintered in the forest of mountain and move into the paddy field to lay eggs on the rice leaf from late seedling stage. A female adult laid eggs for 2 days, and egg, larval and pupal period was 9, 16, and 9 days, respectively. Leersia japonica MAKINO was damaged slightly by the beetle. The yield reduction by artifical defoliation ranged from 6 to 40% and yield reduction increased as leaf feeding delayed until mid-July. All insecicides show 100% of control value against RLB.

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