【摘 要】
：
近年来,随着洋葱种植面积的不断扩大,洋葱霜霉病有加重发生趋势。本病是一种真菌病害,由洋葱霜霉病菌侵染所致,条件适宜发生传染很快,一般可致减产20%～
In recent years, wit
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近年来,随着洋葱种植面积的不断扩大,洋葱霜霉病有加重发生趋势。本病是一种真菌病害,由洋葱霜霉病菌侵染所致,条件适宜发生传染很快,一般可致减产20%～
In recent years, with the growing area of onions, onion downy mildew aggravate the trend. The disease is a fungal disease caused by the infection of onychomycosis onions, conditions suitable for infection occurs quickly, generally can cause cut 20%
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