<![CDATA[Spodoptera litura is main pest destroyer leaves of soybean leaves. As an alternative replacement of synthetic insecticides is bioinsecticides by utility basic ingredients from plant that are easy find such as Piper aduncum L.. The purpose of the research is to find out of a better surfactants concentration which can enhance the effectiveness of Piper aduncum L. extract below 10% which is the concentration 75 g/l of water to control S. litura of soybean. The research was conducted at the Laboratory of Plant Pests, Faculty of Agriculture, University of Riau from March to May 2016. The Research was conducted experimentally by using completely randomized design (CRD), which consists of 4 treatments, where each treatments was replicated 4 times to obtain 16 experimental units. The treatments used in the research were 0 %, 0.025%, 0.037% and 0.050% concentration of surfactants given as the extract of Piper aduncum L. concentration of 75 g/l water. The result showed the addition of several concentrations of surfactants hasn’t been able to increase the effectiveness of the concentration of ekstract Piper aduncum L. under 10% that is concentration of 75 g/l water as bioinsecticides in controlling the S. litura. But the addition of surfactants on the concentration of 0.05% (recommended dose) can increase the death of S. litura as big as to 7.5%. Keyword : Spodoptera litura F., surfactants, Piper aduncum L]]>
