Uji Beberapa Konsentrasi Ekstrak Tepung Daun Bintaro (Cerbera manghas L.) terhadap Mortalitas Larva Kumbang Tanduk (Oryctes rhinoceros L.) pada Tanaman Kelapa Sawit

Abstract

The Rhinoceros beetle (Oryctes rhinoceros L.) is the main pest on oil palm plantations (Elaeis guineensis Jacq.). An environmentally friendly control of Oryctes rhinoceros is by using botanical pesticides extracted from bintaro leaf flour (Cerbera manghas L.). The research was conducted at the Plant Pest Laboratory, Faculty of Agriculture, Riau University. The study was conducted from February to April 2021. This research was conducted experimentally using a completely randomized design (CRD) consisting of 5 treatments. Each treatment was repeated 4 times to obtain 20 experimental units. The treatment given was the concentration of bintaro leaf powder extract as follows: 0 g.l^-1 water, 25 g.l^-1 water, 50 g.l^-1 water, 75 g.l^-1 water, 100 g.l^-1 water. Observation from this research consist of initial time of death, lethal time 50, lethal concentrate 50 and 95, daily mortality, total mortality, temperature, and humidity. Daily mortality data obtained from the results of the study was displayed in graphic form and analyzed descriptively. The data on the beginning of mortality, total mortality, and lethal time (LT50) were statistically analyzed using the Honestly Significant Difference (HSD) at the 5% level, and the data on the beginning of mortality, total mortality, and lethal time (LT50) were statistically analyzed using the Honestly Significant Difference (HSD) at the 5% level.The results of the analysis showed that bintaro leaf powder extract was not effective in controlling O. rhinoceros larvae because, at a concentration of 100 g.l^-1 water, it only caused total mortality of  62.5 %.