Abstract
Vertical distribution of the white peach scale, Pseudaulacaspis pentagona (Targioni), on tea plants was investigated, and the relationship between the elimination rate of the scale by pruning and depth of pruning were estimated on the basis of the distribution data. The most abundant number of the scales on a tea plant was found at a position a little above the mid part of the tea bush, and there were few scales on young branches in the stratum of leaves and around the lower part of plants. The elimination rate of the scales by pruning increased with depth of pruning from the top of a bush. When 70%, 60% and 50% of branches from the top of a bush were pruned, it was suggested that elimination rates were 80%, 70% and 60%, respectively.
