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小麦丛矮病近几年在我县小麦生产上已上升为主要病害。为了控制丛矮病的发生蔓延,我们对丛矮病发病与灰飞虱的关系及其防治方法进行了研究。一、灰飞虱的早春活动与丛矮病的显症灰飞虱在我县一年发生五代,以第五代三龄若虫在麦苗根部或土缝中越冬,来年春天当气温稳定在3℃时开始活动,5℃以上就可取食,8℃以上进行发育。灰飞虱三龄前传毒力低,进入四龄后才大量显症。丛矮病的显症在春季有两个高峰,第一个高峰在3月10日至17日,这是冬前感病的病株在早春显症。第二高峰是在4月15日至5月4日,为四、五龄
In recent years wheat dwarf disease in our county wheat production has risen to the main disease. In order to control the spread of clumpy dwarf disease, we studied the relationship between the occurrence of cercidous disease and the brown planthopper and its control methods. First, the activities of Laodelphax striatellus and the dominant disease of Cong dwarf disease Laodelphax striatellus occurs in our county for five generations a year, with the fifth generation of third instar nymphs overwintering in the root or soil of wheat seedlings. When the temperature is stable at 3 ℃ When started activities, 5 ℃ above can be fed, more than 8 ℃ for development. The third instar larvae of Laodelphax striatellae virulence before entering a large number of significant symptoms after the age of four. The dominant disease of dwarf disease in the spring has two peaks, the first peak in the March 10 to 17, which is pre-winter susceptible strains in early spring symptoms. The second peak is from April 15 to May 4, for the fourth and fifth years