Chicory is named Cichorium intybus L. Alias ​​Kasni (dimensional name). Is a perennial herb of the Asteraceae family. Take the whole plant into the ground. There is a clear liver and gallbladder effect. Distributed in the northeast, northwest, north, Shandong, Jiangxi and other places.
Symptoms Chicory soft rot begins at the petioles near the ground and gradually expands upward. The disease department started with a light brown water stain, and the posterior color darkened, which severely spread to the whole plant.
Pathogen and Erwinia CarotovoraSubsp.carotovora (Jones) Bergey et al. Carrot soft-rotted Erwinia carotovora caused by soft rot, a bacterium. Bacterial short rod-like, weekly 3-6 flagellum, size l-20.5-0.7 (μm), Gram-negative, facultative anaphylactic. On the gravy Chen agar plane, the colony is rounded and convex, gray and white opaque, glossy, smooth surface edge, no deciduous film without spore, pathogen growth temperature 25-30 °C, maximum 38-39 °C, minimum 4 °C, lethal temperature 48-5l°C.
Transmission routes and disease conditions The pathogens remain in the soil as they remain in the soil, and they invade the wounds by means of splashes of rain, water, and insects. Temperature 27-30 °C, prone to disease in the rainy conditions. Even crop fields, low-lying water, sweltering heat, and heavy humidity.
Prevention methods (1) Serious disease areas or severe disease fields should be implemented with 2-3 years of rotation for grass crops. Low-lying fields should be cultivated with ridge or sorghum, and flood irrigation is strictly prohibited. Watering should be controlled during epidemics. (2) The use of compost produced from Japanese enzyme strains should be carefully managed. Farming activities in the field should be avoided as far as possible to prevent the occurrence of wounds. It was found that the diseased plants were deeply buried or burned. (3) Spray 30% copper oxychloride suspension agent 800 times or 47% Garnett's wettable powder 1000 times and 77% kill wettable powder 500 times, 30% green suspension 400 times liquid agent, 14% complex ammonia copper water agent 300 times. (4) Pay attention to ventilation and cooling during storage and transportation. The drug was stopped 3 days before harvest.
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