Early-proof greenhouse cucumber downy mildew
Cucumber downy mildew is one of the most important diseases of greenhouse cucumber. Generally caused by 20% -30% reduction in production, serious reductions of up to 50% or even cause the destruction of the entire shed. Therefore, we must grasp the word “early†in the prevention and control to control the incidence and harm of cucumber downy mildew in advance. First, nurturing strong seedlings First, to strengthen water and fertilizer management, shallow ground, promote root growth, to promote melon seedlings grow robust and improve disease resistance. Second, 75% of chlorothalonil was used to prevent disease before and after the planting. Second, the degree of ecological control of cucumber downy mildew and damage losses, and leaf condensation. Therefore, to adjust the temperature and humidity in the shed can inhibit the occurrence of downy mildew. After sunrise, make full use of the morning light to close the greenhouse to increase the temperature and reduce the humidity. The temperature rises to 28°C-32°C and the humidity drops to about 60%, which is beneficial to the photosynthesis of cucumber and suppresses the occurrence of downy mildew. Then, ventilation is started. Increase the ventilation when the temperature continues to rise. Third, supplement nutrition in the planting before the application of phosphorus, potassium fertilizer, in the growth period of cucumber according to the growth of cucumber should be given to nutritional supplements. Spraying potassium dihydrogen phosphate, borax, urea mixed solution, spraying once every 10 days, even spraying 2-3 times, can quickly and effectively provide the required nutrients to plants, promote robust growth of cucumber, improve disease resistance. Fourth, chemical prevention and control based on the adoption of agricultural measures to prevent and control the choice of low toxicity, low residue, high-efficiency pesticides, reasonable collocation, exchange of use, control of the disease.
It is used to create an image of internal body structures such as tendons, muscles, joints, blood vessels, and internal organs. Its aim is often to find a source of a disease or to exclude pathology. The practice of examining pregnant women using ultrasound is called obstetric ultrasound, and was an early development and application of clinical ultrasonography.
Ultrasound are sound waves with frequencies which are higher than those audible to humans (>20,000 Hz). Ultrasonic images, also known as sonograms, are made by sending pulses of ultrasound into tissue using a probe. The ultrasound pulses echo off tissues with different reflection properties and are recorded and displayed as an image.
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