一、烟草病害 烟草生长进入中后期后，病害大量发生，做好此期病害的防治，是保证烟叶优质丰产的关键。 病害的种类主要有：烟草病毒类病害、黑胫病、赤星病、青枯病、根结线虫病、角斑病、野火病、白粉病等。其中叶斑类病害为防治的重点，以药剂防治为主，同时辅助农业防治， First, the tobacco disease Tobacco growth into the late, the disease occurred in large numbers, do a good job in this period of disease prevention and control, is to ensure that the key to high-yield tobacco. The main types of diseases are: tobacco virus disease, black shank disease, brown spot disease, bacterial wilt, root knot nematode disease, angular leaf spot, wildfire, powdery mildew and so on. Among them, the leaf spot disease is the key point of prevention and treatment, mainly taking the chemical prevention and cure as well as assisting agricultural prevention and control,