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- Title
Control effect of parasitic Metaphycus parasaissetiae on host Parasaissetia nigra.
- Authors
Fang-ping Zhang; Li-ming Niu; Yong-chi Xu; Dong-yin Han; Jing-bao Zhang; Yue-guan Fue
- Abstract
A laboratory test was conducted to study the control effect of parasitic Metaphycus parasaissetiae on its host Parasaissetia nigra. The functional reactions of the parasitism conformed to the Holling Type E Equation, but the parameters of the functional reactions varied with temperature. Taking the ratio of instant attack rate to preying time (a/Th) as an evaluation index, the preying efficiency at 30 °C was the highest, with a/Th being 23.4211. There was a stronger interference effect in the functional reactions of the parasitism within M. parasaissetiae populations. With the increase of the population density, the amounts of parasitism decreased gradually. Hassell Equation (E = QP-m) could describe the relationships between the searching efficiency of M. parasaissetiae and its population density much precisely within the range of 21°C-33 °C. The interference increased with temperature within the range of 21 °C -27 °C , and the interference coefficient reached the highest ( 0. 6626) at 27 °C. When the temperature was raised to 30 and 33 °C , the interference coefficient decreased to 0. 6161 and 0. 5916, respectively. In the prophase of egg-laying, the parasitized P. nigra could be entirely controlled by M. parasaissetiae. However, when a few larvae were crawling out, the control effect was declined to 81. 4%.
- Subjects
HOST-parasite relationships; PARASITIC insects; TEMPERATURE effect; INSECT population density; HOSTS (Biology)
- Publication
Yingyong Shengtai Xuebao, 2010, Vol 21, Issue 8, p2166
- ISSN
1001-9332
- Publication type
Article