摘要
[目的]为探明田间六(4)代稻纵卷叶螟对扬州地区水稻生产的影响及其防治指标。[方法]通过田间人工控制虫量,设立4个不同虫量梯度,测定不同虫量稻纵卷叶螟为害对武运粳23号(顶部倒1～3叶)卷叶率、产量损失的影响。[结果]在稻纵卷叶螟2龄幼虫0～20头/穴范围内,随着虫量的增加,叶片卷叶率增大、水稻产量下降、水稻产量损失率增高;根据经济允许损失率为3%的计算标准,得出稻纵卷叶螟在武运粳23号上的防治指标为2龄幼虫虫量173头/百穴。[结论]该研究结果为扬州地区六(4)代稻纵卷叶螟的有效控制提供了理论依据。
[Objective] The aim was to find out effects of fourth-generation Cnaphalocrocis medinalis on rice production in Yangzhou District and its control index.[Method] Through artificial control of insects in field,4 different insect volume gradients were set,the effects of different Cnaphalocrocis medinalis amounts on leafroll rate and yield loss of Wuyunjing No.23 were determined.[Result] The results showed that within the range of 0-20 head/hole,with increasing of insect amounts,rice yield decreased,leafroll rate and rice yield loss rate increased.According to 3% economic permit loss rate,the control index of Cnaphalocrocis medinalis on Wuyunjing No.23 was 173 head/hole.[Conclusion] The study will provide theoretical basis for effectively control fourth-generation Cnaphalocrocis medinalis in Yangzhou District.
出处
《安徽农业科学》
CAS
北大核心
2010年第15期7891-7892,共2页
Journal of Anhui Agricultural Sciences
基金
扬州市自然科学基金项目(YZ2007040)
关键词
稻纵卷叶螟
卷叶率
产量损失
防治指标
Cnaphalocrocis medinalis
Leafroll rate
Yield loss
Control index
