Physiological diseases are due to crop growth environmental conditions, such as temperature and light discomfort, lack of nutrition or imbalance, resulting in poor crop growth. It is not caused by infection with bacteria (ie, bacteria, fungi, and viruses). Therefore, the use of pesticides by such diseases is useless, and the more serious they are, the more plants will die. 1, baldness also known as no production point, caused by low temperatures. Prevention measures include delaying planting at proper intervals, taking various measures to increase temperature, and increasing fertilizer and water. 2. Potassium deficiency disease shows dwarfing plants, short internodes, small leaves, bronze leaves, yellowish green leaves, and subsidence of the main vein. The chlorosis between the veins is more severe in the later period and spreads to the middle of the leaf, and then the leaf blade is necrotic and the leaf margins are drier. This is similar to the leaf edge blight caused by pesticide poisoning. The prevention and control measures are based on potassium sulphate as base fertilizer or top-dressing fertilizer, and the amount of mu is 10 kg. 3. Physiological drought occurs after planting, with dark green color, slow growth, or no growth. Root rust, mild wilting. Similar to wilt disease, the whole plant withered when severe. This is due to the excessive supply of farmyard manure, especially chicken manure, when planting. This will also happen if too much fertilizer is applied. Control methods: Manure bottom soil blended with other soils. Fertilization should take a combination of paving and furrowing methods. Mild can pour some water. 4. Old and young seedlings include aging seedlings or flower toppings. Aging seedlings do not love growth. Flower topping is reproductive growth and vegetative growth, dense leaflets near the growth point, large bud inclusion, each leafhopper grow small melon button. Causes: improper treatment of ethephon; excessive breeding days; excessive rooting during colonization; drought; excessive application of foliar fertilizer; Prevention: remove the root melon and the top female flowers, chase after the available nitrogen fertilizer, watering, try to increase the soil temperature, reduce air release. 5, due to low temperature caused by colonization of yellow seedlings. Every effort must be made to increase the temperature of the earth, including early cover grass. If the ground temperature does not reach 10°C, planting should be delayed and the small arch shed should be detained after planting.
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