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First, the cause of the disease: (1) species. Changchun Mickey and Shandong Mate are not anti-bitter bitters, and bitterness is hereditary. Choosing bitter melon as a seed, the offspring must be affected. (2) Moisture. Root water control improper, or physiological drought, are easy to form bitter. (3) Fertilizers. Absorption ratio of cucumber to nitrogen, phosphorus and potassium should be 5:2:6. Once nitrogen is high, it is easy to cause leggy and bitter melons appear on the side and weak branches. (4) Temperature. When the ground temperature is lower than 12Â°C, the physiological activity of the cells is reduced, so that nutrient and moisture absorption are inhibited, resulting in bitter melon production. The temperature is higher than 32 Â°C for a long time, especially if it exceeds 35 Â°C. The respiratory depletion is higher than that of photosynthetic products. Malnutrition can also cause bitter melon. (5) The plants are weak. Due to lack of illumination and fungal, bacterial, and viral infections or senescence of plant physiological functions at the later stages of bitter melon development, the cause of bitter melon production is caused.
Second, control methods: (1) selection of disease-resistant varieties. At present, Jin Za 2 or 4 or Jinyan 4 can be selected. (2) Strengthen the ecological management of greenhouses. 1 moisture. The principle of watering is that shed soil is not poured. Watering should do see wet see dry. 2 temperature and humidity control. With agricultural measures such as watering and weeding, adjust the air outlet up and down so that the temperature in the morning is 25-30Â°C and the relative humidity is maintained at 75%. In the afternoon, the temperature is maintained at 20-25Â°C and the relative humidity is maintained at 70%. 3 balanced fertilization. According to the nutrient required for each growth period of the crop, 50 kg of superphosphate or 50 kg of diammonium phosphate shall be applied to the planting furrow per gram of base fertilizer, and nitrogen, phosphorus and potassium shall be followed in full bloom (5:2:6). The proportion of fertilization, the late fertility to adopt foliar spraying potassium dihydrogen phosphate, to maintain the photosynthesis of functional leaves, prevent bitterness.
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Dongguan Vanilla Bioengineering Co., Ltd. , https://www.healthecigarette.de