Prevention and control of celery spot blight in protective field
Blight commonly known as "fire dragon", winter and spring, the incidence of serious protection. It usually occurs on the leaves and can also harm the petioles and stems. There are two kinds of large-spotted and small-spotted types on the leaves. The early stages of the disease are similar. The old leaves first develop morbidity, and the lesions are mostly scattered. At the beginning, they were light brown, oily, small spots with sharp edges. They expanded to a round shape with brown edges. From light brown to grayish white, many small black spots emerged from the lesions and yellow halos outside the lesions. Low temperature and high humidity are conducive to the occurrence and prevalence of diseases. The temperature is 20°C to 25°C, and the incidence of wet and rainy weather is heavy. Control methods: 1 selection of disease-resistant and disease-resistant varieties according to local conditions. 2 seed disinfection. Soak the seeds in warm water at 50°C for 30 minutes, then put them in cold water and cool them to dry. This method will reduce the germination rate by 10%, and should increase the seeding rate or soak the seeds with 50% methicillin WP 500 times for 24 hours. 3 agricultural control. Implementation of 2 to 3 years of rotation, to strengthen field management, rational close planting, adequate base fertilizer, seedlings to see fertilizer, enhance plant resistance to disease, clean pastoral, reasonable water control. 4 Conservation cultivation should pay attention to temperature and humidity, temperature control during the day 15 °C ~ 20 °C, higher than 20 °C to release air in time, control at 10 °C ~ 15 °C, reducing the temperature difference between day and night, reduce condensation, avoid flooding irrigation. 5 Chemical control: When the diseased leaves are removed at the onset of illness, 5% chlorothalonil smoke agent 250 g/mu smoke can be used for protection. According to the condition of continuous use 2 to 4 times, interval 7 to 10 days 1 time. Real Time Nucleic Acid Diagnostic Instruments Real Time Quantitative Pcr,Nucleic Acid Diagnostic Instruments,Home Nucleic Acid Diagnostic Instruments,Real Time Nucleic Acid Diagnostic Instruments Jiangsu Dinai Bioengineering Co.,ltd. , https://www.dinaipcr.com