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霜霉病发生时期现已打破常规,大棚春茬、日光温室早春茬、大棚秋茬、节能日光温室秋冬茬均可发生且受害重,成为水果型黄瓜生产上年年发生或茬茬发生、危害颇重的常发病害。
Downy mildew period has now broken the conventional greenhouse spring crop, greenhouse early spring crop, greenhouse autumn crop, autumn and winter energy-saving greenhouse can happen and suffer heavy, as a result of fruit-type cucumber production occurred or stubble occurred, the hazard Quite often the disease.