Key points of Management of Datian Rose after Flood

After the beginning of July every year, different degrees of flooding will occur in different parts of the country at different times. From July 7 to 8, torrential rain in Kunming, Yunnan caused nearly 10,000 mu of rose seedlings along the Dianchi Lake and low-lying hills to be soaked in flood for more than 24 hours, resulting in a direct economic loss of more than 80 million yuan. For this reason, I only use my superficial knowledge of summer management of cut rose flowers to discuss with the majority of flower producers the production management of cut rose flowers after the flood. First, the climatic characteristics after the flood. The temperature in the shed is higher, and the temperature difference between day and night is large. In central Yunnan, after the flood, if the plastic greenhouse with a shoulder height of 2m and a top height of 3.50m, the temperature in the greenhouse is between 28 and 42 degrees Celsius at sunny noon; if it is in the plastic greenhouse with shoulder height of 1.50m and top height of 2.50m, the temperature is between 35 and 48 degrees Celsius. At night, the above specifications of the greenhouse, its internal temperature is only between 15 degrees Celsius to 17 degrees Celsius. two。 The air humidity in the shed is relatively high. In the plastic greenhouse after the disaster, the relative humidity is 60% to 70% during the sunny day and more than 80% to 90% at night. Second, rose seedlings after the flood 1. Mud covers the branches and leaves. two。 Young shoots, wilting or rotting in sunny days, mature or old branches deciduous. 3. The petals rotted and the rotten buds doubled. Third, rose field management after the flood. Discharge the stagnant water in the field as soon as possible, loosen the topsoil in time, and discharge the toxic gas produced by planting roots under the condition of anaerobic respiration, so as to reduce the damage of planting roots and restore the normal absorption capacity of roots. two。 Remove the damaged flowers and leaves in time. After the flood, which pressure damage, soaking, broken flowers and leaves should be sorted out in time, and then sprayed with a wide range of fungicides, such as carbendazim, chlorothalonil, metalaxyl and so on. 3. rinse the sludge on the branches and leaves in time to restore the photosynthetic capacity of the branches and leaves. Spray Guangpu fungicide chlorothalonil, carbendazim, metalaxyl, etc., to protect the affected branches and leaves from falling leaves or less. 4. Shading and ventilation to reduce the physiological harm to petals caused by high temperature and humidity during the day. Cover the roof with 30% to 50% sunshade net, open or roll up the side film of the greenhouse, so that the shed has the effect of ventilation and cooling. Reduce the temperature of the greenhouse to below 28 degrees. 5. Prevent downy mildew and gray mildew as early as possible. After the flood, due to the increase of air humidity in the shed, the night temperature dropped to 15 to 18 degrees, creating conditions for the occurrence of rose gray mildew and downy mildew, resulting in a large number of fallen leaves and rotting flowers and buds. The main pesticides to prevent rose downy mildew and Botrytis cinerea are Kelu, Anke Manganese Zinc, Sukeling, Shijiale, Ruidu and so on.