Abstract:

Phassus actinidiae has been recently a new stem-boring pest which injuries Actinidia trees severely in the north of Fujian Province.The study on its bionomics and the control measures were carried out in Actinidia Experiment Station in Jianning Fujian during 1984-1989.The results show that the insects reproducd one generation a year and overwinter as eggs on ground near the tree stumps.The larvae bore the phloem and pith and form tunnels inside and dust bags outside the injured parts, which hinder the normal transportation of nutrients and water, as a result, it leads to discolor of shouts and leave even dieback of the tree.Apart from selecting plant varieties resistant, some effective control measures must be applied, such as pouring water dilution of 2.5% Decamethrin the ratio of 1:5000(insecticide:water) or stuffing the tosci mud made of 90% Dipterex crystals into the burrows on the trunks of host plant; smearing Vaseline mixed with Dichlorvos around the trunk to prevent the larvae from climbing up; killing the larvae with fine iron wires and capturing the adults immediately after incubation etc.

Key words: Phassus actinidiae Yang et Wang, Actinidia spp., Bionomics, Control experiment