Effectiveness Trichoderma and Beauveria bassiana on Larvae of Oryctes rhinoceros On Palm Oil Plant (Elaeis Guineensis Jacq.) In Vitro

O. rhinoceros horn beetle (Coleoptera: Scarabaeidae) is the main pest attacking oil palm crops in Indonesia, especially in palm oil rejuvenation areas. The study was conducted from April to August 2016 in the laboratory of the Faculty of Agriculture, Al-Azhar University, Medan. The materials used in this research are horn beetle pest larvae (O. rhinoceros) originating from PT. Socfin Indonesia, Trichoderma sp fungi originating from the Food...