Studie on the Change of Damage made by Oligia vulgaris in Bamboo stands converted from “off” year to“on”year and Its Control

Mao bamboo Phyllostachys pubescens Mazelex H. de Lehaie stands occupies l6 000 hm2 in area in Longyou County Zhejiang Province,70% of which ranks with stands of“on”and “off” year and low yield.Productivity is improved by the new managing system of conversion of bamboo stands from“on”and “off” year to even year. This paper indicates that Oligia vulgaris (Butler),an important insect pest on bamboo shoots,causes increasing damage in converted stands,and leads over 90% of new shoots worthless in severe cases.The percentage of shoots damaged correlates linearly with the cover degree of Gramineous grasses, the intermediate hosts of the insect.Digging for weeding in bamboo stands significantly reduces shoot losses.Effective control of the insect can be achieved by either spraying l0% glyphosate on grasses at the rate of 7 500 mL/hm2 in late February,or spraying 40% SN-85l and 40% omethoate,each at the rate of 600 mL/hm2,on new shoots at the beginning of shoots remaining in early April.