Agriocnemis femina (Odonata: Coenagrionidae) and its significance in environmental parameters of rice pests in northern Sumatra-Indonesia

Abstract

The pattern movement and age structure influence of rice cultivation phases on A . femina aquatic organisms was investigated in the Manik Rambung rice field (MRRF) ecosystem in North Sumatra . A . femina collections of a buterfly net samples were collected in five cultivation phases (fallow , plough , transplanting - young , tiller , mature atau preharvest) . Agriocnemis femina adult (Odonata : Zygoptera) , one of the rice pest predators in the adult stage , was dependent on its interactions with rice cultivation phases . There were three age classes of A . femina ; teneral , juvenile and mature with sex ratio male and female is 1 . 7 : 1 . It was important in regulating Agriocnemis femina population in MRRF which determined its successful emergence to a predatory adult . Rice cultivation managements that focus on enhancing the population of Agriocnemis femina would contribute to more effective biological control of rice pests .