Abstract:

The occurring regularity and integrated management of the scale-insect,Kuwanaspis howardi Cooley,were studied on Guantang Forest Farm of Chibi,Hubei Province from 1990 to 1994.The results showed that most of the pest had two generations,and a few one or three generations during a year.The winter was passed by most of the second-generation pregnant adult female and a few by the first generation adult female or the 1st-instar larva or 2nd-instar female larva of the third generation.The main natural enemies were some of the lacewings,parasitic wasps,fungi and mites.The insect mainly occurred at the foot of mountains,northern slopes and in thick bamboo forestlands,especially on the six years old bamboos,on which the scale insect was found on 93.3% of the trunks below 3 metres. When the incubation of the first generation adults was in boom in the last ten days of May,the control effect against it could respectively reach 79.2%,85.75%,93 1% by spraying trunks with 20% deltamethrin emulsion,injecting trunks with 40% dimethoate emulsified oil and pouring roots with 3% granulated carbofuran,but the incubation of adult was long,the control effect of the bamboo forest was not obvious.The good effect of control was achieved by thinning,cultivating and cleaning the damaged bamboo forest with the pest density declining to 1.45 heads from 100 heads per 100 quarter centimeters,and by strongly lumbering bamboos seriously injuried by the insect,fully reclaiming and cutting snotches,and applying fertilizer by burying green litters with the pest density decreasing by 97.0%,and the mean diameter of renewing bamboos increased by 1.3 centimeters.

Key words: Kuwanaspis howardi Cooley, Occurring regularity, Integrated management