Sinergisme Ekstrak Piper aduncum dan Tephrosia vogelii terhadap Penggerek Batang Padi Kuning Scirpophaga incertulas

Abstract

Rice (Oryza sativa) is one of the important staple food commodities in the world. One of the important pests on rice is the yellow rice stem borer (YRSB) Scirpophaga incertulas. Various control measures have been implemented to maintain rice production. One of the alternative control techniques that can be applied is by using botanical insecticides. The purpose of this study was to determine the synergism between Piper aduncum and Tephrosia vogelii extracts against YRSB larvae. P. aduncum and T. vogelii extracts, either tested separately or in mixtures with concentration ratios of 1:1, 2:1, and 1:2, were effective against YRSB larvae. The treatments with these extracts caused death in YRSB larvae at 72 hr after treatment in which the affected larvae showed internal tissue damage symptom. The most toxic test material to YRSB larvae was P. aduncum and T. vogelii extract mixture with a concentration ratio of 1:2. LC50 and LC95 P. aduncum extract were 0.175% and 0.126%, respectively, while those of T. vogelii extract were 1.620% and 2.075%, respectively. P. aduncum and T. vogelii extract mixture with 1:1 ratio had LC50 0.056% and LC95 0.143%, while those with 2:1 ratio had LC50 0.025% and LC95 0.149%. LC50 and LC95 of the mixture with 1:2 ratio were 0.016% and 0.083%, respectively. P. aduncum and T. vogelii extract mixtures at the three concentration ratios were more effective than P. aduncum and T. vogelii extracts applied separately and synergistic to YRSB larvae.