摘要
在北方棉区，大田棉花黄萎病造成的产量主体损失是由重病株以上级别病株所致。形成重病株以上级别病株的根源，主要是苗期黄萎病菌的侵染。无论是在中肥田或高肥田，第一次发病高峰期形成的发病株率和发病程度远高于第二次发病高峰期，即第一次发病高峰期形成的重病株以上级别病株是构成棉花产量损失的主要来源。
The paper showed that the cotton losses of verticillum wilt were mainly caused by the heavy disease cottons,and the heavy disease cottons came from the seedlings infestation by verticillum wilt.Either in the high fertilized land or in the middle fertilized land,the first outbreak was much heavier than the second outbreak.
出处
《植保技术与推广》
1998年第2期37-39,共3页
Plant Protection Technology and Extension
