Distribution of Pissodes yunnanensis Pupal Cells on Pinus yunnanensis

Pissodes yunnanensis was a species of insect pest newly discovered on Yunnan pine (Pinus yunnanensis) in southwest of China. The larvae attacked and pupated on trunks and lateral branches of Yunnan pine.This paper discussed the distribution of P.yunnanensis pupal cells on Yunnan pine in Lijiang, northwestern Yunnan. The pupal cells distributed in the middle and upper parts of the trunks, accounting for 76.99 % of the total cells on the trunks. Rate of pupal cells on the trunks were about 70.27 % of total cells in the infested trees , appearing to be more than that on lateral branches. On the whorls, pupal cells mainly distributed in the middle and upper parts of lateral branches, accounting for 87.69 % of the total cells on lateral branches. Regarding the trunks and lateral branches growth, pupal cells mainly distributed in 1 or 2 years growth. The results on pupal cells distribution within trees provided a basic information necessary to develop efficient tactics in the weevil control.