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大棚黄瓜霜霉病的综合防治黄瓜霜霉病又叫跑马干，俗称烘被子，在大棚栽培中普遍发生，危害严重。黄瓜从幼苗到成株整个生育期均受其害，主要危害叶片，也能感染茎、卷须和花梗。其症状是：１．幼苗感病：子叶正面先出现不均匀的褪绿黄化，然后呈不规则枯黄斑，背面产生一...
Greenhouse cucumber downy mildew prevention and control of cucumber downy mildew, also known as Happy Valley, commonly known as baking quilts, greenhouse cultivation in general, serious harm. Cucumber from the seedlings to adult throughout the growth period are subject to damage, the main hazard leaves, but also can infect stems, tendrils and pedicels. The symptoms are: 1. Seedlings susceptible: cotyledons front appeared uneven fade yellow, and then showed irregular dry yellow spots, back to produce a ...