Predation and Control of Harmonia axyridis against Tinocallis kahawaluokalani

Harmonia axyridis and Tinocallis kahawaluokalani adults were trapped in Hangzhou Botanical Garden, Zhejiang province in August 2017. Experiment of predation of H. axyridis against T. kahawaluokalani was carried out in the laboratory. The results showed that the predation of H. axyridis was conformed with the model Holling-Ⅱ,with the equation of Na=0.987 5N/(1+0.005 43N). The rate of instantaneous attack was 0.987 5 and handle time was 0.005 5 day. By fitting the interfering model of Hassell and Valley, the relationship between predation rate (E) and prey density (P) was E=0.542P-0.809 with 0.542 of prey constant and 0.809 interfering parameter. By fitting the model of Holling, the equation was Na=127.99exp (-61.55/N), with the best density of 61.55. In May 2017, experiment was implemented on release of H. axyridis in Hangzhou Botanical Garden with different numbers to control T. kahawaluokalani. The results demonstrated that it had different effect with different density.