Symptoms: The celery hollow is a phenomenon of tissue aging, starting from the base of the petiole hollow and gradually developed upwards, and the hollow part appears white floccule-like corked tissue.
Cause of the disease: The celery hollow often occurs in the soil where the soil is thin, especially in the middle and late period when it encounters high temperature and drought, lack of fertilizers, pests and diseases, excessive fat burning, lack of boron, frozen celery, and late harvest. The ability of the roots to absorb fertilizer and water is reduced, and the ground does not receive sufficient nutrition, and the physiological functions of the leaves are reduced, and the nutrients produced are insufficient. In this case, the parenchyma of the petiole close to the pith first ruptures and atrophies, forming a hollow stalk.
Control methods: (a) Select solid celery varieties. (b) Choose suitable plots for planting. It is appropriate to use sandy loam rich in organic matter, water retention and fertility, and good drainage and irrigation conditions. The pH of the soil should be neutral or slightly acidic, and should not be planted on clay or sandy soil. (C) temperature control. Celery prefers cool and humid environmental conditions. The celery is cultivated in the greenhouse. The daytime temperature is 15Â°C~20Â°C. The maximum temperature is no more than 25Â°C. It should be maintained at about 10Â°C at night and not lower than 5Â°C. Usually appropriate ventilation, reduce air humidity. (d) a reasonable fertilizer. Apply enough base fertilizer to spread evenly and apply about 5,000 kilograms of organic manure per acre. It is best to add 100 to 200 kg of fermented chicken manure or 15 kg of diammonium phosphate. Planting seedlings after easing the seedlings, applying about 10 kilograms of ammonium sulfate per acre with water, or fermenting human excrement. During the growing season, the top dressing is mainly available nitrogen fertilizer. In combination with potash fertilizer, each time about 20 kg is applied and fertilizer is applied once every 15 days. To prevent the lack of boron hollow, 0.3% ~ 0.5% borax solution can be applied to foliar fertilizer. Water pouring. We often keep the earth moist. In addition, we must pay attention to the timely prevention of pests and timely harvest.
Second, petiole cracking
Symptoms: The main manifestation is that the base of the stem ruptures simultaneously with the petiole.
Causes of morbidity: First, it is caused by lack of boron; Second, it is caused by growth retardation under low temperature and drought conditions. In addition, sudden high temperatures, high humidity, excessive water absorption of the plants, resulting in rapid water filling of the tissues, can also cause cracking.
Control methods: First, apply adequately decomposed organic fertilizer, apply 1 kg of borax per acre, and fully mix with organic fertilizer; second, spray 0.1%~0.3% borax aqueous solution on foliar, in addition, pay attention to uniform watering in management. .
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