求翻译：烟草赤星病是危害烟草最为严重的叶部病害之一，一旦感病，不仅烟叶的产量、产值及上等烟比例下降，且对烟叶的内在化学成分产生不良影响，从而影响其品质和使用价值是什么意思？

Tobacco brown spot disease is one of the most serious hazards of tobacco leaf disease, once infected, not only the proportion of output, output value and superior tobacco of the tobacco fell, and have a negative impact on the intrinsic chemical composition of tobacco, which can affect their quality

Red Star tobacco disease is the most serious crimes against tobacco leaf diseases, once one of feeling sick, not only the tobacco production, output and the decline of the proportion of smoking tobacco, and to the chemical composition, and thus have a negative impact on their quality and value

Tobacco red star sickness harms one of tobacco most serious leaf department plant diseases, once feels sickness, not only the leaf tobacco output, the output value and the superior smoke proportion drop, also produces to the leaf tobacco intrinsic chemical composition affects not good, thus affects

Tobacco brown spot disease is one of the most serious hazards of tobacco leaf diseases, once the disease not only decline in tobacco leaf yield and output value and choice of tobacco, and have an adverse effect on intrinsic chemical composition of tobacco, thereby affecting their quality and value

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