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盲蝽象是我县棉花主要害虫之一。随着绿肥面积逐年增加,盲蝽象为害程度也成倍上升。1970—1973年的四年内,我县棉花嫩头被害率达5—10%,严重的田块高达100%。几年来,在查治盲蝽象的实践中,初步摸索到一些规律。据近七年的观察,为害棉花的盲蝽象主要有中黑盲螬象、绿盲蝽象和苜蓿盲蝽象三种。但是年度间棉花上几种盲蝽象的种群变化较大。1969—1972年的优势种是苜蓿盲蝽象,其次是中黑盲蝽象和绿盲蝽象。1973年开始,绿盲蝽象上升为优势种,其次是中黑盲蝽象和苜蓿盲蝽象。1975年中黑盲蝽象的数量又开始上升,种群变化的原因不详,但绿
Blight bugs like cotton is one of the major cotton pests in our county. With the increase of green manure area year by year, the extent of the damage caused by the black bugs has doubled. In the four years from 1970 to 1973, the damage rate of cotton tender in our county was 5-10%, and the serious plots were as high as 100%. Over the past few years, in the investigation of the treatment of lizarry elephants, preliminary found some rules. According to the observation of the past seven years, the main stink bug affecting cotton is the black-blind, the green-blind stink bug and the alfalfa-like stink bug. However, the population of several species of Nymph on cotton varies greatly during the year. The dominant species of alfalfa from 1969 to 1972 were followed by the black bugs and the green bugs. Starting in 1973, the green-blind stink bug rose to the dominant species, followed by the black stink bug and the alfalfa stink bug. In mid-1975, the number of black bugs started to rise again. The reason for the population changes is unknown but green