目前，该病害的防治方法主要包括轮作、培育抗病品种和使用化学药剂。其中轮作防病被广泛使用，但对一些特殊经济作物或特定地区无法达到合理轮作要求的，具有较大的局限性。培...

In this paper, I will focus on the effects of potato blight bring. For example, the effect on the population, the effect on demographics and the emigration and so on. In this paper, it will introduce more about the famine and the effects, it...