Greenhouse cultivation of vegetables (including winter greenhouses, arch shed) is often affected by the disease, in addition to the use of fumigant control, the commonly used method is spray control. However, many rural households use the same pesticides and the same ratio, but the control effect is not the same. The reason for this is that apart from human factors, it has a great influence on water quality and water temperature. The author provided his own experience gained during the discussion with some rural households.
Specific measures: The best match is for water and pesticide sprays that are compatible with the shed temperature (temperature, ground temperature). It is also possible to prepare a vat (plastic) in the shed and put in a proper amount of water for use. If the temperature of the greenhouse is about 25°C, and the ground temperature is about 20°C, the water between 20-25°C may be used, and the hot water may also be used to exchange the water temperature. Because the greenhouse temperature is similar to the water temperature, it will not affect the plant growth due to the large temperature difference. In addition, the water will evaporate quickly and the efficacy will be fast. It will also promote rapid dispersion of water and uniform dispersion of chemicals. Will not aggravate the disease due to water overheating during the dispensing.
Hot-dip galvanization is a form of galvanization. It is the process of coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 840 °F (449 °C). When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O2) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO2) to form zinc carbonate (ZnCO3), a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances. Galvanized steel is widely used in applications where corrosion resistance is needed without the cost of stainless steel, and is considered superior in terms of cost and life-cycle.
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