Target spot disease mainly damages the leaves of cucumbers and spreads to petiole and vines when severe. The front and back of the blade can be damaged. The diseased leaves begin as yellow water-soaked spots. As the lesions continue to expand, the lesions on the front of the leaves are slightly depressed, the lesions are nearly round or irregular, and the lesions are peripherally brown. The middle is light yellow. Mid-morbid lesions are easily perforated, and the lesions on the front of the leaves are rough and uneven. The lesions turn brown as a whole. The central part is grayish and translucent, and the center of the lesion often has an obvious eye-like bull's-eye. When the humidity is high, the lesion is often accompanied by a ring-shaped black moldy material, and when severe, the leaves dry and die.

Control methods: 1. Strengthen management, timely ventilation and dehumidification, not flood irrigation, in order to reduce the indoor humidity.

2. Remove diseased bodies in time, and timely bring the diseased leaves and diseased fruits out of the field.

3. Pay attention to alternate medications to avoid drug resistance. The optional agents include 40% Fortune's EC 8,000 times, 40% Myclobutanil 3000 times, etc., sprayed every 7-10 days, and sprayed 2-3 times. Can also be appropriate to add foliar fertilizer is better, the focus is to spray the middle and lower leaves.

Vitamin

Another benefit of vitamins for the human body is that it can help the growth and development of the human body to operate normally, especially for teenagers, vitamins are one of the essential nutrients in the growth process. For example, vitamin D can well adjust the metabolism of some trace elements in the human body, and can also promote the absorption of calcium by the human body, maintain bone health, and maintain a balance between the blood phosphorus level and the blood calcium level in the human body.

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