[Control effect of parasitic Metaphycus parasaissetiae on host Parasaissetia nigra].
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 II Equation, but the parameters of the functional reactions varied with temperature. Taking the ratio of instant attack rate to preying time (a/T(h)) as an evaluation index, the preying efficiency at 30 degrees C was the highest, with a/T(h) 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 degrees C - 33 degrees C. The interference increased with temperature within the range of 21 degrees C - 27 degrees C, and the interference coefficient reached the highest (0.6626) at 27 degrees C. When the temperature was raised to 30 and 33 degrees 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%.
Hainan Province Key Laboratory of Pests Detection and Control for Tropical Agriculture/Ministry of Agriculture Key Laboratory of Monitoring and Control of Tropical Agricultural and Forest Invasive Alien Pests, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, Hainan, China. fangpingz97@163.com
Fang-Ping
FP
Zhang
Li-Ming
LM
Niu
Yong-Chi
YC
Xu
Dong-Yin
DY
Han
Jing-Bao
JB
Zhang
Yue-Guan
YG
Fu
D000818:Animals; D018554:Avena / Q000469:parasitology*; D001517:Coleoptera / Q000502:physiology*; D006430:Hemiptera / Q000502:physiology*; D010572:Pest Control, Biological; D011235:Predatory Behavior / Q000502:physiology*