Greenhouse celery sclerotinia disease prevention and control
Zhang Huazheng, a farmer from Pingyi County, Shandong Province, asked: What is the prevention and treatment of greenhouse celery sclerotinia? A: The disease is harmful to the celery stems and leaves. The affected area was initially brownish and immersed. When the humidity was high, soft rot was formed. White mycelium was produced on the surface, and black rat sclerotia was formed. Sprouting temperature is 5°C～20°C, 15°C is optimal, and the disease is easy to occur and prevalent when the relative humidity is above 85%. Control methods: 3 years rotation. Before sowing, soak it with 10% saline, remove the sclerotia and rinse with clean water, and dry it for sowing. At the beginning of the onset, spray 50% Sucral or 50% Acethosine or 70% Thiophanate-methyl wettable powder 600 times or 50% Carbendazim wettable powder 500 times. In the shed, dust was sprayed with 5% chlorothalonil dust at 1 kg/mu. Reasons why cucumber leaves are drier Li Wenyan, a farmer from Baishui County, Shaanxi Province, consults: Why do the leaves of cucumbers dry? Answer: (1) The room should be ventilated, timely and appropriate, large temperature difference between inside and outside the shed, do not suddenly let out the wind, to prevent the cucumber can not stand. (2) Adopt the formula fertilization technology and apply compost or decomposed new organic fertilizer made by Japanese enzyme bacteria to reduce the amount of chemical fertilizers. In particular, timely and appropriate amount of fertilizer should be applied. Attention should be paid to the application of fertilizer such as ammonium sulfate and other accessory residual soils to facilitate the soil. The concentration of the solution is moderate and it is advisable to apply full-yuan fertilizer. (3) Soils with high salinity, sometimes with white salts, should be washed with salt and soaked in water. If necessary, they should be flooded for 15 to 20 days in the summer to make the salt in the soil leach into the soil. Deep layers reduce the salt content of the tillage layer. (4) The soil with high salt content in the surface layer can be solved by the deep-turning method, and the conditions can also be changed. (5) When using insecticides and bactericides, scientific and rational drug use should be done. The concentration should not be increased easily. The leaves can be moistened without dripping. Use small-diameter jets as much as possible to facilitate even spraying. Crop K deficiency symptoms Farmer Wang Xiaolong of Ning County, Gansu Province asked: What are the symptoms of crop K deficiency? Answer: In the absence of potassium fertilizer in crops, the tip of the lower leaves will yellow at first, and gradually yellow along the edges of the leaves, but the veins on both sides of the leaves and the midribs will remain green. When severe, it will gradually develop upwards from the lower leaves, eventually causing most of the leaves to yellow and the edges of the leaves to be fiery. Cereal crops will result in weakening of tillering power, short internodes, weakly sagging leaves, and soft and easy lodging of stems. The dicotyledonous plants will cause the leaves to curl, gradually shrink, and sometimes the leaves will be incomplete, but the middle of the leaves will remain green. Root crops cause root weight to decline and quality is poor. Industrial Food Mixer,Food Mixer,Professional Food Mixer,Stand Mixer Guangzhou New Power Catering Equipment Manufacturing Co.,Ltd , https://www.gznewpower.com