Vitamins are trace organic substances that humans and animals need from food to maintain normal physiological functions.It plays an important role in human growth, metabolism and development. Vitamins are not involved in building cells in the body, nor do they provide energy for the body.
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Prevention methods: (1) Ecological control: mainly through the control of the temperature and humidity in a good shed,
Create a condition conducive to the growth of cucumber that is not conducive to the occurrence of disease, and achieve the purpose of preventing disease and increasing production. (2) Chemical control: spray with DuPont Kelu or Precair. Spray once every 7-10 days, continuous prevention and treatment 2-3 times.
Symptoms: Occurred in the middle leaves, with immersed lesions on the back of the leaves, especially evident in the morning, with yellowish or yellow-brown patches (restricted by veins), and black moldy layers on the lesions when wet.