The rice leafhopper is one of the main paddy pest species in China, while the paddy spider is the primary predator of the rice leafhopper. In the past, the degree of damage that suffered as a result of paddy pests and the control manifested by paddy spiders toward pests was generally determined by the qualitative research method, which can hardly accurately reflect the dangerous degree of the pest toward the rice and the controlling ability of the spider toward the pest. This research focuses primarily on t...