论文部分内容阅读
近几年,二斑叶螨在北京市平谷县一些乡镇为害愈加严重,个别被害苹果园造成8月份落叶。为此,我们于1998年3～4月份对该螨越冬场所及传播途径作初步调查并提出防治意见。 1.越冬部位田间调查 在平谷县夏各庄村13年生富士苹果园进行,于1998年3月14～15日调查5株树,调查越冬部位的分布量。主干取50块翘皮,有螨皮17块,占34％,主枝(50cm段)取50块翘皮,有
In recent years, two-spotted spider mites in some townships in Pinggu County, Beijing, more serious damage caused by individual apple orchards in August deciduous. To this end, we conducted a preliminary investigation of the overwintering sites and routes of transmission of the mites from March to April 1998 and put forward prevention and treatment suggestions. 1. Field survey of overwintering site Field investigation was conducted at Fuji Apple Orchard, a 13-year-old Xiagezhuang Village, Pinggu County. Five trees were surveyed from March 14 to March 15, 1998 to investigate the distribution of overwintering sites. Maintain 50 pieces of skins, there are 17 pieces of mites, accounting for 34%, the main branch (50cm pieces) take 50 pieces of skins, with