Abstract — Pardosa pseudoannulata and Verania lineata are two generalist predators commonly found in rice fields. Only a few references indicate their presence as joint predators resulting in positive interactions to brown planthopper without competition. The research aimed to determine the predation rate of joint predators in competitive conditions. The research was conducted in the laboratory using a Completely Randomized Design (CRD) with different combinations of joint predators. The density of P. pseudoannulata (P) and V. lineata (V) were 1, 3, 5 individuals per treatment (P1V1, P1V3, P1V5, P3V1, P3V3, P3V5, P5V1, P5V3, and P5V5). Each treatment had five replications. The results showed that competition and cannibalism factors indicate a negative interaction that affected the predation rate of joint predators. The ability of P. pseudoannulata to survive in competitive conditions was lower than V. lineata. The suitable and safe combination was using one (1) P. pseudoannulata and three (3) V. lineata (P1V3) with 89.6% predatory rate on Nilaparvata lugens Stål on the first day, and with the lowest death rate of two predators. The P1V3 combination also had an increase in bodyweight of P. pseudoannulata and a competition model that resulted in draw conditions. Therefore, before using some predators to control the BPH optimally, there is a need to minimize the impact of competition and cannibalism on them.
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