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临沂市河东区、临沭县、沂南县、莒南县的农民素有种植夏秋黄瓜的习惯,它既是8、9月份蔬菜补淡的主要品种,也给农民带来较高的经济效益;然而,近年来随着病虫危害加重,黄瓜减产严重,有的甚至失败。下面就黄瓜常见病虫害发生情况及防治方法作一介绍,供参考。一、黄瓜霜霉病主要在黄瓜生长中后期,天气稍凉时发生。发病初期,先在叶脉间出现水浸状失绿小斑点,逐渐变黄色。病斑直径扩大至5～16毫米时,因受叶脉限制
The farmers in Hedong District, Linshu County, Yinan County and Junan County of Linyi City, known as the habit of planting cucumber in summer and autumn, are not only the main varieties of vegetables in August and September but also bring higher economic benefits to peasants. However, in recent years, as pests and diseases have increased, cucumber production has been severely reduced and some have even failed. The following cucumber pests and diseases on the common occurrence and prevention methods for an introduction for reference. First, the cucumber downy mildew mainly in the late cucumber growth, the weather occurs when the cooler. Early onset, first appeared in the vein between the small dip greenish water immersion, gradually turn yellow. Lesion diameter expanded to 5 to 16 mm, due to restricted by the veins