论文部分内容阅读
1.症状识别:收获初期至盛期,植株一直发育健壮,但在晴天中午叶片突然出现急剧萎蔫症状,到傍晚也能复原,切断导管观察,并未发现导管变黄变褐,也无乳状混浊物溢出,所以可以肯定既不是真菌性导管侵染引起的枯萎病,也不是细菌性青枯病。而是一种生理性急性萎蔫病。 2、发生原因:由于连续阴天不揭草帘,黄瓜植株不能进行正常的光合作用,植株处于饥饿状态。地温低,根系活动弱。一旦晴天,室温突然升高,空气温度降低,叶片水分蒸腾快,根系吸收水分功能弱,地下部分向上
1. Symptom identification: early harvest to the peak, the plant has been robust, but noon on a sunny day sharp wilting sudden symptoms, can also be restored in the evening, cut off catheter observation, did not find the catheter turns yellow brown, nor cloudy milky milky It overflows, so it is certain that it is neither Fusarium wilt caused by fungal duct infestation nor bacterial bacterial wilt. It is a physiological acute wilting disease. 2, the occurrence of the reason: As a result of continuous cloudy uncovered curtains, cucumber plants can not be normal photosynthesis, plants in starvation. Low temperature, weak root activity. Once sunny, the room temperature suddenly rises, the air temperature decreases, the leaf transpiration is fast, the root absorbs water weakly, and the underground part is upward