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黄瓜作为吐鲁番地区大棚主栽品种多年连作,其病原菌抗性不断提高,病害日趋严重。部分菜农治病心切,乱用农药、频繁进行高浓度喷药或者几种农药混合喷施,使药剂微粒直接堵塞植株叶表气孔、水孔,导致植物光合、蒸腾和呼吸作用受阻,从而表现出一系列生理病害和组织病变,发生药害。发生药害时,叶片受害最重,一般表现为叶片枯萎、叶色退减逐渐变为黄白色,并伴有各色枯斑、边缘
As the main varieties of greenhouses in Turpan for many years even for the continuous, the resistance of pathogens continue to increase, the disease is becoming more serious. Some vegetable farmers are eager to cure diseases, indiscriminate use of pesticides, frequent high-concentration spraying or spraying of several pesticides so that the drug particles directly block the leaf stomata and water holes of the plants and cause the photosynthesis, transpiration and respiration of plants to be blocked, thereby exhibiting a Series of physiological diseases and tissue lesions, phytotoxicity occurs. In the event of phytotoxicity, the leaves hardest hit, the general performance of the leaves withered, leaf color gradually reduced to yellow and white, and accompanied by colored spots, the edge