During the growth of cucumber, if malnutrition, improper management, or encounter with bad weather and certain diseases, it will cause the leaves to turn yellow, affect the growth of cucumber, and even harvest. There are three main reasons why cucumber leaves turn yellow:
The lack of yellow leaf-type yellow leaf is divided into middle and lower old leaf first yellow and middle and upper young leaf first yellow. The middle and lower parts of the old leaves are first yellow, and the missing elements are mostly elements easily reused in the plant body, such as nitrogen, potassium, magnesium and zinc.
The main performance is four points: First, the entire plant growth is resisted, the older leaf leaves the first green lack of nitrogen. Prevention and control measures are foliar spray 0.5% ~ 1% urea solution 2 ~ 3 times. Second, the whole plant growth did not significantly resist the loss of green and yellow veins, yellowing between leaves and veins, green edges, or residual green spots, not curly, magnesium deficiency. The prevention and control measures are foliar spray of 1% to 2% magnesium sulfate solution. Third, no significant inhibition of plant growth, leaf margin chlorosis and necrosis, sometimes there are chlorosis to necrotic spots on the leaves, for the lack of potassium. Prevention and control measures are foliar spray of 0.3% ~ 0.5% potassium dihydrogen phosphate solution 2 ~ 3 times. 4. There was no obvious resistance to plant growth. The entire leaf had chlorosis to necrotic spots or striations and was zinc deficiency. The control strategy is foliar spray of 0.2% zinc sulfate solution. The middle and upper leaves are yellow, and most of the missing elements are elements that are not used in the body of the plant, such as calcium, sulfur, and iron.
Prevention and control measures The point of growth is withered, the leaf lacks green and shrinks to necrosis; the roots are stunted, with few melons, and calcium deficiency. Foliar spray 0.3% calcium chloride solution twice a week. The growing point is not dead, the leaf color is light green, and the small stems are short of sulfur. Foliar spraying 1% potassium sulfate solution. The growing point does not die, the leaves are yellow-white and iron-deficient. Foliar spray 0.5% iron sulfate solution.
Downy mildew Yellow downy mildew is a disease that occurs during the growing period of cucumber and is a serious hazard. At the onset of the seedling stage, the leaves turned green and yellow and finally died. The pathogenesis of adult leaves began to show water-stained small round spots on the back of the leaves. This was particularly evident in the morning and gradually developed into yellow-brown polygonal lesions with yellow-green spots on the edges. Under high temperature conditions, the lesions on the back of the lesions are grayish-brown moldy. In severe cases, the lesions are divided into patches. The whole leaf is yellow-brown and the leaf margins are curled and withered.
Prevention and control countermeasures with Rhizoctonia, Manganese and Zinc 58% WP500 times or 75% chlorothalonil WP, 50% WP WP 600 times spraying, once every 7 days, usually spray 3 to 4 times.
Fusarium wilt yellow leaf wilt disease is commonly known as "dead lice." At the early stage of disease, some leaves wilted at noon and recovered sooner or later, and they did not recover after several days. Leaf color gradient yellow-green to yellow-brown, from bottom to top gradually extended to the whole plant. The main vines on the near ground were rotted, thinned or longitudinally cracked, gradually dry, and the whole plant died. The rhizomes have an amber gel, and when the temperature is high, white or pink molds appear on the surface. When the stems or main roots are broken, the interiors can turn brown.
Prevention and control measures are to use 50% carbendazim WP500 times, or methyl tropoxazol 50% WP500 times to irrigate the root, each strain is not less than 250ml, 5 to 6 days irrigation once, with irrigation 2 to 3 times.
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