Abstract
SummaryThis is the second paper dealing with techniques necessary to the population estimation of the Cryptomeria red mite feeding on a coniferous Cryptomeria tree, with the final object of determining the absolute population. Results are as follows: The population can be defined as the whole of mites existing on branches with foliage younger than two years old, because more than 95% of individuals are always there. Optimal sampling unit varies according to mite population. Unless a fixed unit is necessary, seasonal placement of units is recommended. Since significant variance is associated with crown levels, representative sampling from each level is designed. These calculation should be based on the data transformed to logarithms, as the relation between mean and variance suggests that the population data are of contagious distribution. A trial to calculate the total length of branches for each age, which is needed for the conversion to absolute population, is described.
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