Sensitivity Test of Nilaparvata lugens Stall to Pymetrozine Insecticide

Abstract

Brown planthopper (BPH) Nilaparvata lugens Stall is a major pest of rice that often causes outbreaks in several rice production centers in Indonesia. The use of insecticides is still the choice of farmers to control attacks due to weak mitigation efforts in an area. Continuous use of insecticides can increase the resistance and resurgence of BPH. The purpose of this study was to determine the level of sensitivity of the BPH population to the pimetrozine insecticide. The research was conducted at Assesment and Research Instalation of Agricultural Technology Ungaran, Assesment Institute of Agricultural Technology Central Java, Semarang Regency, Central Java, Indonesia from October 2019 to June 2020. The BPH population was collected from five regions, namely Jaten and Bolong Districts, Sukoharo District, and Bendosari, Mojolaban and Pulokarto Districts, Karanganyar District. The method of sensitivity test of BPH to insecticides was carried out according to the IRAC method number 005. Observations were made on the percentage of BPH mortality. The data was processed using Probit analysis to determine the LC50 value. The LC50 value was used to determine the resistance factor (RF). The results showed that the population of BPH Bolong Karanganyar was the most sensitive to the insecticide pymetrozine with an LC50 value of 13.44 ppm. The populations of BPH Jaten, Bolong, Bendosari, Mojolaban and Pulokarto were not resistant to pymetrozine insecticide due to the level of RF was ≤4. The population of BPH Pulokarto Sukoharjo with an RF value of 2.47 has the potential to become more resistant to the insecticide pymetrozine. It is necessary to periodically monitor the resistance of BPH to pymetrozine insecticides in the Karanganyar and Sukoharjo areas to prevent further resistance development.