Chen, G.H., Tao, M., Yang, B.L., & Chen, F.S. 2003 Study on the population dynamics of Chilocorus rubidux Hope and its predacious function.. Journal of Yunnan Agricultural University 18(2): 136-139.

Notes: From March to September 2001, a field survey of the population dynamics of Chilocorus rubidux [Chilocorus rubidus] was carried out in a plum orchard in Chenggong, Kunming, China. In this orchard, Didesmococcus koreanus caused severe damage to the trees and no chemical control measures were applied. A laboratory experiment was also carried out to observe the predacious function of C. rubidus as the natural enemy of D. koreanus. C. rubidus showed the largest population in mid-April and mid- to late July. Simulation of the predacious role of C. rubidus with the mathematical models of Holling-II and Holling-III demonstrated that the optimum seeking density of adults, fourth- and third-instar larvae was 76.31, 35.61 and 32.24, respectively. The seeking efficiency of the ladybird decreased with an increase in the population density of the prey. The seeking efficiency of adults was greatest, followed by that of 4th- and 3rd-instar larvae.