小麦纹枯病发生与流行规律的研究

小麦纹枯病有两个明显的发生与流行时期:(1)小麦出苗到返青期;(2)小麦植株拔出第三个茎节(日平均气温在10℃以上)到成熟。返青后地上部症状消失,出现发病停滞期。病害的消长与小麦生育有密切关系。 施肥种类、小麦密度、降雨、土壤水分、日照等影响小麦纹枯病发生与流行程度。施入氮肥、油饼肥及大量农家有机肥料,密植等使植株生长茂密,发病重。适宜的土壤含水量,成株期降雨量多、雨日多、日照少,是加重纹枯病发生和流行的重要气象因子。

Study on Development and Epiphytotics of Wheat Sharp Eyespot Disease

Wheat's sharp eyspot disease is in two stages of development and epiph-ytotics:i ) from wheat plants emergence till returning greenii ) from third the stem nodes growing out till mature period. The dese-ase symptoms disappeared after the plants returning green and a lag phase of the desease appeared. So the disease's development and decline is closely related to the plant's growth stage.The degree of the disease can be affected by many factors such as kinds of fertilisers applied,plant density,rainfall.soil moisture content and sunshine time, etc. Applications of nitrogen fertilizer, oilcake and more manure or close planting make wheat grow prolifically and get more serious desease. More rainfall and less sunshine during growing are important climatical factors to worsen the desease.