油菜在冬天生长过程中，往往在田间出现不同程度的红叶现象，其原因主要是遇到外界不良因素的影响，导致油菜叶片由绿变红，这会严重影响产量。因此，必须查清不同原因，采取相应的补救措施和对策。油菜发生红叶病常有以下几种情况：一、苗密红叶。直播或多株移栽密度过大或单 During the growth of winter rape, rape leaves often appear in different degrees in the field. The main reason is that rape leaf turns from green to red, which will seriously affect the yield. Therefore, we must find out different reasons, take appropriate remedial measures and countermeasures. Rape leaves often occur in the following situations: First, Miao dense leaves. Live or multi-plant transplanting density is too large or single