The several of Jengkol peel extract (Pithecellobium lobatum Benth) against corn armyworm (Spodoptera frugiperda J. E. Smith) in the laboratory

Abstract

Spodoptera frugiperda J. E. Smith is an invasive insect that has become a pest on corn plants in Indonesia. S. frugiperda attacks maize plants from the vegetative to generative phases. Leaves of corn plants attacked by S. frugiperda larvae. with plant populations affected by 55-100% causing yield losses of 15-73%. The usual control is the use of synthetic insecticides, but the use of synthetic insecticides continuously or unwisely will have a negative impact on humans and the environment, therefore a safe and environmentally friendly alternative control using vegetable insecticides is jengkol plants (Pithecellobium lobate Benth). This study aims to obtain an effective concentration of jengkol bark extract to control armyworm pests Spodoptera frugiperda J.E. Smith in the laboratory. The study was conducted experimentally using a complete randomized design (RAL) consisting of five treatments with four repeats so that 20 experimental units were obtained. The concentration of jengkol bark extract used is 0 g.l-1 water, 25 g.l-1 water, 50 g.l-1 water, 75 g.l-1 water, and 100. g.l-1 water. The parameters observed were an initial time of death (hours), lethal time 50 (hours), lethal concentration (LC50 and LC95) (%), total mortality (%), temperature, and humidity. Jengkol bark extracts with a concentration of 100 g.l-1 water is an effective concentration in controlling corn plant pests (Spodoptera frugiperda J. E. Smith) in the laboratory because this concentration is able to cause total mortality of 90% with an initial time of death of 17.25 hours after application and lethal time of 50 at 60.75 hours after application.