Prevention and treatment of greenhouse celery late blight
Late blight of celery, also known as spot blotch and leaf spot, is a common disease in celery. The celery late blight that is grown in the greenhouse is heavier than the open celery, which has a great influence on the yield and quality of celery. Occurrence characteristics: Late blight of celery is a fungal disease. Bacteria can overwinter on seeds and sicknesses. Sick seeds are sown, which cause disease after emergence and produce conidia that spread in the nursery bed. Diseases and debris on the source of overwintering bacteria, in appropriate conditions, resulting in conidia spread by wind and rain, infestation of celery, and then produce conidia repeated infection. The germs grow well under cold and humid conditions. The optimum temperature for the disease is 18-25°C, and the humidity is above 95%. The greenhouse celery is generally affected more seriously. In case of continuous rainy weather, frequent temperature fluctuations, or dew condensation, and plant growth will weaken, the favorable diseases will rapidly expand and spread. The disease can continue to develop during the Tibetan period and the loss is often heavier than in the field. Prevention methods. Prevention and control of celery late blight must first strengthen the fitness cultivation, in addition to the selection of sowing disease-free seeds, do a good job in seed disinfection, in the management of fertilizer and water should also be fully applied mature compost, prevent partial application of chemical nitrogen fertilizer, the implementation of fine ditch irrigation , Do not water and water temperature irrigation, keep vegetables and vegetables to ventilate, spray appropriate plant growth hormone and foliar fertilizer, in order to increase plant resistance to disease, with the ventilation and humidity of the greenhouse and night insulation management, reduce day and night The temperature difference reduces the condensation of the plants, controls the infection of the bacteria, and eliminates the leaves of the diseased plants to reduce the source of bacteria in the field. When the field first saw the disease, it was necessary to pay close attention to spraying and prevention. The current best medicines for controlling celery late blight are: 75% Chlorpyrifos eradication wettable powder 600 times, or 64% antivirus liquid M8 wettable 500 times, or 40% polysulfide suspension 500 times liquid, generally sprayed per mu. Liquid volume 50-75 kg, one of the above-mentioned agents, sprayed once every 7-10, sprayed 2-3 times. Shaanxi Haibo Biotechnology Co., Ltd. specializes in the research, production and sales of natural plant extracts for the pharmaceutical industry. Shaanxi Haibo Biotechnology Co., Ltd. has R&D, production, quality inspection, sales and other departments. Shaanxi Haibo Biotechnology Co., Ltd.'s main products are alpha arbutin, nicotinamide for skin, sepiwhite, maca extract, etc., specializing in the research, production and sales of natural plant extracts used in the pharmaceutical industry. Shaanxi Haibo Biotechnology Co., Ltd. has R&D, production, quality inspection, sales and other departments Plant Extract,Chaga Extract,Epimedium Extract,Yohimbine Extract SHAANXI HAIBO BIOTECHNOLOGY CO., LTD , https://www.rozenbio.com