霜霉病是棚室黄瓜的毁灭性病害,主要原因是棚室内湿度大、温度高,特别是通风不良,叶片结霜多,易发生此病害。因化学防治易产生药害且效果也不好,所以本文介绍几种在实践中比较有效的生态防治法。 1、高温闷棚选择晴天的中午密闭棚室(在闷棚前一天要浇足水),使棚室温迅速升至45℃,保持2小时后放风降温。由于病害在高温 Downy mildew is a devastating disease of greenhouse cucumbers, the main reason is the shed indoor humidity, high temperature, especially poor ventilation, leaf frosting and more prone to this disease. Because of chemical control easy to produce phytotoxicity and the effect is not good, so this article describes several in practice more effective ecological control. 1, boredom choose a sunny day at noon airtight greenhouse (in the day before the stuffy shed to pour enough water), so that the studio temperature rose rapidly to 45 ℃, to maintain 2 hours after the wind cooling. Due to disease at high temperatures