Predation and Competition of Two Predators (Pardosa pseudoannulata and Verania lineata) on Different Densities of Nilaparvata lugens in Laboratory

Pardosa pseudoannulata (Araneae Lycosidae) and Verania lineata (Coleoptera Coccinellidae) are common predator found in agroecosystem. Several studies have described the ability of these predators to prey on Nilaparvata lugens (Hemiptera Delphacidae). However, the study that explained the density impact of N. lugens on the ability predation in competition condition by both predators have not been completely known. A research had been conducted in the laboratory to study the predation and model of competition on different densities of N. lugens. The study used a completely randomized design in 10 replications. The prey densities for single predation were 5, 10, 15, 20 and for predation by competition were 10, 20, 30, 40 and without prey. This study revealed that the density of prey influenced the ability of predation of the two predators, which in turn, it also affected their growth. The impact of prey behavior on the predation and competition process between the two predators was also discussed in this article.