藠头主要病虫草害发生动态及生态调控技术

Research and Demostration of Ecological Regulation Techniques of Scallion's Main Deseases and Pests

头主要病虫为"三虫三病"。蚜虫和紫斑病发生时间早,主要在3月下旬和5月下旬发生;霜霉病和韭蛆危害时期为3月中旬至5月中旬,受雨量影响大;葱蓟马在雨季前的3月中旬至4月下旬发生重,随后受雨量影响下降;基腐病从4月下旬开始流行,一直到收获仍有不同程度发生。生态调控技术是指以合理轮作、选用抗性品种、加强健身栽培、保护利用蜘蛛等农业措施防治为主,辅以对口的高效低毒低残留农药适时防治。

There are mainly three deseases and three pests for scallion. Aphids and Alternaria porri emerge early in a year, it being mostly in late March and late May respectively. Bradysia odrphaga and Pseudo peronospora cubensis damage heavily during mid-March and mid-May, effected greatly by the rainfall. Thrips tabaci lindeman's occurs from mid-March to late April, then descreased by the rainfall. Erwinia carotovora pv. Carotovora Dye outbreaks in late April, influencing before Scallion is harvested. The ecological regulation techniques is spiders. Meanwhile highly effective, low-toxic and short residue pesticide is necessary to timely use.