Issue:ISSN 2095-1353
CN 11-6020/Q
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2013年50 No.2
Using mathematical modeling to analyze the mortality of Tetranychus urticae infested by Hirsutella thompsonii
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Key Words：Hirsutella thompsonii, Tetranychus urticae, temperature and humidity, concentration of spore, mortality, mathematical model
Abstract：The efficiency of controlling Tetranychus urticae Koch with the pathogen Hirsutella thompsonii Fisher under various
humidity and temperature conditions was investigated and Grey model prediction and regression analysis were used to
construct a mathematical model of the effects of various parameters on mite mortality. The results indicate that the model
was a perfect fit under the test conditions. Control was most effective at a temperature, humidity and pathogen
concentration of 28.09℃, 100% and 2.5 million/mL, respectively, with a death rate of up to 81.66%. The influence of
temperature on H. thompsonii was found to be greater than that of humidity. H. thompsonii was found to be more sensitive to
changes in the environment at high temperature and humidity. It is concluded that the control efficiency of T. urticae by H.
thompsonii is not high and would need to be improved if H. thompsonii is to be used as a biocontrol agent.