Research on the control of Parasaissetia nigra Nietner by Coccophagus japonicus Compere
Author of the article:WU Xiao-Shuang1, 2** NIU Li-Ming1 FU Yue-Guan1 CHEN Jun-Yu1 HAN Dong-Yin1 LI Lei1 WU Qi-Qi1,
Author's Workplace：1. Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China; 2. Institute of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
Key Words： Coccophagus japonicus Compere; Parasaissetia nigra Nietner; temperature; functional response; interference effect
Abstract： [Objectives] To determine the
potential of the parasitoid Coccophagus japonicus Compere as a
biological control for Parasaissetia nigra Nietner. [Methods] The functional responses
of C. japonicus to
the 3rd instar of P. nigra were studied at 18, 21, 24, 27, 30
and 33 ℃, respectively, and the
effect of intra-specific competition on the
predatory efficiency of C. japonicus was also studied at 27 ℃. [Results] The functional responses of C. japonicus to the 3rd instar of P. nigra conformed to the Holling II and Holling-Ⅲ equations, but the parameters of the functional response
varied with temperature. In the range of 18 to 33 ℃, parasitic
efficiency, which was evaluated by the ratio of instantaneous attack rate to
handing time (a¢/Th), was highest (53.86)
at 24 ℃. Intra-specific competition between individuals of C. japonicus increased with density. Parasitism under different densities of C. japonicus at 27 ℃ could be modelled by the Hassell equation (E = QP-m). [Conclusion] C. japonicus has the potential to be an effective biological
control for the 3rd instar of P. nigra.