Abstract
Position of egg-masses deposited in autumn by the viburnum leaf beetle, Pyrrhalta humeralis (CHEN), was observed on a hedge of host trees in March, 1984, and the oviposition behaviour of the beetle was analyzed in relation to the age of the branches of the host tree. Although no definite vertical preference was observed among the branches on the tree, beetles deposited more than half of their egg-masses on the one-year old branches, and the frequency decreased when the branches were older. The majority of the egg-masses was deposited within a range of 10mm from the nearest buds, and in relation to the distance from the terminal tip of branches, more than half (or the majority) of them was located within the distance of 20mm (or 60mm), respectively.
