First, the wounded yellow leaves
The yellow leaves caused by poor root or root injury are the main reasons for the current yellow leaves of cucumber. The yellow leaves are mainly caused by watering and fertilizing too many roots, or they are caused by the roots of the roots caused by the cloudy days after watering. Its performance symptoms are: the plant leaves are generally yellow, especially the top leaves are small, grow slowly, and show wilting in severe cases.
In this regard, it is recommended that sprinkler irrigation should be used in combination with comprehensive prevention and control. Spraying, that is, foliar spraying with zinc and iron-containing foliar fertilizers, and then adding 600 times cytokinin to prevent leaf senescence and promote leaf greening. Irrigation, i.e., rooting, seedling growth, or chitin promotes root growth.
Second, the lack of yellow leaves
The ground temperature is low, root activity is poor, and the nutrients absorbed by roots are insufficient to meet the growing needs of cucumber plants and fruits, resulting in yellow leaves of cucumber. Especially after the root injury, it is more likely to lead to the occurrence of deficiency symptoms, which in turn will increase the occurrence of yellow leaves.
The lack of yellow leaves is divided into middle and lower old leaves first yellow and middle and upper young leaves first yellow. Middle and lower old yellow leaves, the lack of elements mostly nitrogen, potassium, etc.; middle and upper leaves first yellow, the lack of elements mostly calcium, iron, zinc and so on.
In this regard, it is recommended that the correct leaf fertilizer should be selected for spraying according to the different parts of the yellow leaf disease and different performances. If potassium deficiency can be sprayed 500 times potassium dihydrogen phosphate solution, nitrogen deficiency can be sprayed 300 times the urea solution, calcium deficiency can be sprayed 1000 times the liquid Green Fenwei 2, and so on.
Third, disease yellow leaves
Downy mildew, angular spot disease, brown spot disease, virus disease and so on are all important causes of cucumber yellow leaves. Downy mildew and keratoses mostly damage the middle and lower leaves of cucumbers. Brown spot disease has been on the rise in recent years, and most of them have occurred from the middle leaves and developed rapidly upwards. The vegetable farmers are commonly called “little yellow spotsâ€. Although the environment of the greenhouses is low temperature and high humidity in the recent past, the virus disease is still severe. The symptoms often occur at the leaves of the cucumber growth point, resulting in yellow-green mottled mosaics.
For diseased yellow leaves, fungicides should be applied in time for prevention and treatment. It can be used to control downy mildew and bacterial keratoses by adding 600 times liquid of PID 500 times plus 300 times of white sugar; thiophanate-methyl can be used 700 times and Baitai 1000 times can be used to remix aromatic leaves 500 Double liquid spray to control brown spot; can use 300 times of ningnanmycin plus zinc leaf fertilizer plus Yunda 120 spray to prevent viral disease.
Fourth, drug yellow leaves
When farmers use drugs to prevent disease, they generally use excessive amounts of drugs. However, in winter, the temperature of the vegetables is low, growth is slow, growth is relatively weak, and resistance is also weakened. One-time overdose is very likely to cause yellow leaves. If mancozebite is sprayed excessively, manganese poisoning is prone to occur, resulting in yellowing of leaves and distortion of veins.
In this regard, it is recommended that medication must be reasonable, once the phytotoxicity can be foliar spray more than 600 times the love to add 600 times liquid Yunda 120 to ease.
Five, bad weather, yellow leaves
In winter, it is cloudy for many days, and the time for drawing sheds is short. Low light and damage can also cause yellow leaves of cucumber. The management of cucumbers in winter greenhouses needs timely uncovering grasshoppers, releasing air, venting light, and removing harmful gases. It also cooperates with foliar spraying of chitin to mix full-fledged leaf fertilizers to protect the leaves and improve the disease resistance and resistance of the leaves.
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