玉米粗缩病毒的传毒介体灰飞虱的虫量、不同播期对玉米粗缩病的影响

1996～ 1999年连续 4年 ,在玉米粗缩病的常发重病区河北省辛集市夏玉米区 ,对灰飞虱虫口数量、不同播期和玉米粗缩病发生程度进行了系统调查。结果表明 :在灰飞虱大发生年和常发生年 ,6月 15日以后为河北省夏玉米区的安全播期 ;在灰飞虱的极轻发生年 ,不同播期对病情无明显影响。因此 ,播期是影响玉米粗缩病发生的关键因素 ;灰飞虱虫量是玉米粗缩病发生发展的重要因素 ,预测灰飞虱的发生情况 ,适期播种 ,可有效地防治玉米粗缩病 ,达到高产稳产。

Infulence of Vector Laodelphax striatellus Fallen and Sowing Dates on the Disease Caused by Maize Rough Dwarf Virus

From 1996 to 1999,the investigation of Laodelphax stratellus Fallen-a vector of maize rough dwarf virus(MRDV),the experiment of different sowing dates and MRDV disease incidence were carried out in Xinji city of Hebei.The results showed similar tend with disease incidences.All results reveased that in vector severe or moderate occurrence year,06-15 and later was the suitable sowing period.Otherwise different sowing dates had no obviously difference on disease incidence.It was concluded that sowing date was the key factor,vector number was the important factor for MRDV occurrence and spread.Therefore predicting the vector occurrence and sowing in suitable period could control MRDV disease.