Spatial pattern and time-series dynamics of Didesmococcus koreanus Broch were analyzed by calculating five indices of aggregation,and parameters of Iwao model and Taylor s power law model from March to September.

Aggregation indices indicate the larva distribution is aggregation distribution pattern,and regression analysis indicates its distribution is negative binomial.

This paper deals with the spatial distribution patterns of the larvae of Diorycitria rubella in masson pine and loblolly pine using the frequency distribution analysis and aggregation indices.

There exists signifi- cant correlation between aggregation degrees of C.

The difference of numbers of laid eggs among individuals was measured by the variance to mean ratio, degree of aggregation, and Lorenz curves.

In order to understand ecological habits of army worm and develop sampling method, this paper uses variousindices of aggregated degree and the regression of straight line (M - x) in Taylor method(s2 = ax-b) to analyse the type of space distribution of F2 army worm larvae on the maize.

The effect of packing density of the layer on stress .

The formula for estimating the packing density of the films was put forward in terms of the measured spectral shift; and the packing density of MgF_2 layers in the filters was calcul.