Suppression of joint predators (Pardosa pseudoannulata and Verania lineata) against Nilaparvata lugens in conditions exposed to MIPC insecticide

Abstract

Abstract MIPC is one of the insecticides widely used by farmers to control brown planthopper or BPH (Nilaparvata lugens) in Padang City, Indonesia. Excessive use of insecticides can cause BPH to become resistant, followed by the death of natural enemies. This study aimed to determine the suppression of joint predators (Pardosa pseudoannulata and Verania lineata) against Nilaparvata lugens under MIPC Insecticide Exposure Conditions. This study used a Completely Randomized Design (CRD) factorial with two factors and five replications. The first factor was the dose of MIPC insecticide (0.75 g/l, 1.5 g/l, 2.25 g/l, and without application) and the second factor was the time of application (During BPH infestation and joint predators, before BPH infestation and joint predators, after WBC infestation and before joint predator infestation). The parameter observed were predation, body weight, and mortality. The results showed no interaction between dose and time of application on joint predator predation. Increasing the MIPC dose decreased the predation. Joint predators could suppress BPH populations of 40.6-43.6 individuals (78-81%) per day, but MIPC application and the presence of joint predators together reduced their predation rates. It is better to apply MIPC insecticide before or after the presence of joint predators to avoid negative impacts on joint predators.