[Study on natural population dynamics and spatial distribution pattern of Tyrophagus putrescentiae in stored flour].

OBJECTIVE: To understand the natural population dynamics and spatial distribution of Tyrophagus putrescentiae in storage flour, so as to provide an evidence for its prevention and control.

METHODS: The samples from five sampling points in Wuhu City were collected monthly from January to December, 2013, and examined and counted for T. putrescentiae . The dispersion pattern target, Iwao's m*- x ̄; regression analysis and Taylor's lg S2 -lg x ̄; regression analysis were used for analyzing the spatial distribution pattern of T. putrescentiae in the storage flour.

RESULTS: The peaks of population dynamics of T. putrescentiae were discovered in July and September. The indexes of dispersion were as follows：I > 0, CA > 0, m*/ x ̄; > 1; and the linear regression equation of Iwao：m* = 3.740 3 + 1.017 5 x ̄; ( r = 0.995 8) and Taylor：lg S2 = 0.500 4 + 1.134 9 lg x ̄; ( r =0.832 8) showed that the spatial distribution pattern of T. putrescentiae in the storage flour was assembled.

CONCLUSIONS: The peak of population dynamics of T. putrescentiae in the storage flour in Wuhu City is a double peak type, and the spatial distribution pattern of T. putrescentiae is assembled.