Broad bean spot, also known as red spot disease, soybean meal. It is one of the major diseases of Dafeng County in early winter. When the disease is serious, it causes early defoliation and the yield is reduced. First, the symptoms The newly emerged brown spots on the victim's leaves gradually expanded into round or oval lesions. When the onset was severe, the leaves were dry and deciduous. When the air is wet, the diseased area produces a gray moldy layer. Second, the incidence conditions Broad bean spot disease caused by B. favae infestation. Red spot disease is severe at temperatures of 20°C and relative humidity of 85% or more. Low-lying, poorly ventilated, densely planted, over-promoting growth, and favourable onset. Third, control methods 1. Choose disease-resistant varieties and implement rotation for more than two years. 2. Strengthen field management by increasing manure, phosphorus and potash fertilizers, promote the growth of broad beans, and improve the disease resistance of broad beans. 3 timely sowing: winter sowing broad bean use early maturing, rational dense planting, increase the spacing, increase ventilation and light transmittance, reduce the humidity in the field. 4. Chemical control: During the initial flowering-crusting period, the pesticide should be sprayed as soon as possible. Use 50% fasting WP 1000-1500 times, 70% thiophanate-methyl 800-1000 times, 75% chlorothalonil wettable powder 600 times. Spray once every 7-10 days and spray 2-3 times. 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. Galvanized Steel Pipes,Galvanised Pipe,Galvanised Steel Pipe JIANGSU SKYPLAN GREENHOUSE TECHNOLOGY CO.,LTD , https://www.greenhousehydroponic.com