内蒙古自治区马铃薯黑痣病病原菌(菌核)存活力及地下侵染研究

Survivability and Underground Infection Ability of Potato Rhizoctonia solani(Sclerotium) in Inner Mongolia

马铃薯黑痣病是由立枯丝核菌引起,在各大马铃薯种植区均有发生,目前己成为影响马铃薯生产的主要病害之一。试验研究不同生存环境下病原菌(菌核)萌发率和影响因子的作用以及菌核存活力及地下侵染能力。结果表明,病原菌(菌核)的萌发率随温度升高而增加,相同地区病原菌不同温度下萌发速度不同,菌核萌发率与温度具有定量关系;菌核可多次萌发,第4次萌发仍具有31.76%的萌发率。通过研究了解了不同环境下病原菌的存活力,掌握了适合病原菌萌发的条件,为在生产过程中预防和防治马铃薯黑痣病的发生提供依据。

Black scurf, which is caused by Rhizoctonia solani and occurs in major potato growing areas, becomes one major disease affecting potato production. The experiment studied the germination rates of pathogenic bacteria（sclerotia）,roles of impact factors, and viabilities and underground infection abilities of sclerotia in different living environments. The germination rates of pathogenic bacteria（sclerotia） increased with rising temperature. The germination speed of pathogenic bacteria in the same region varied under different temperatures and the sclerotium germination rates had quantitative relation with the temperature. The sclerotia could germinate many times and the germination rate reached31.76% at the fourth germination. Based on this study, the viability of pathogenic bacteria in different environments, and the conditions suitable for the germination of pathogenic bacteria were learned, providing the basis for the prevention and control of black scurf in potato production.