水稻遭受病虫为害或用药不当造成药害时,往往出现心叶枯死(即枯心苗)现象。通常见到的枯心苗有以下几种。1.三化螟为害的枯心。这种枯心先有“假枯心”的过程,即蚁螟蛀入稻茎后,心叶失水卷缩似荸荠杆,将卷缩的心叶抽出,可见断面整齐,多数能看到幼虫;幼虫继续蛀食3—4天,则咬坏生长点或咬断稻茎,“假枯心”苗变黄枯死,但叶鞘以外叶片仍呈青 Rice suffering from pests or improper use of drugs caused by injury, often withered heart leaf (ie dead heart seedlings) phenomenon. Usually see the dead heart seedlings have the following. 1. Borer damage cucumber. This kind of withered first “fake dead” process, that is, when moth borers into the rice stems, the heart leaves water curl like water chestnut pole, the curled heart leaves out, showing the section neat, most can see larvae ; Larvae continue to eclipse 3-4 days, then bite the growth point or biting off the rice stems, “fake dead heart” yellowing of the seedlings withered, but the leaf sheath is still green outside the blade