Leaf spot disease prevention and treatment of Campanulaceae

The Platycodon grandiflorum is a perennial herb medicinal plant and is used as a root medicine. The methods for preventing and treating Campanulaceae leaf spot disease are as follows:
1. Symptom identification: This type of disease mainly harms the eustoma leaf. (1) When infested by spot blotch, white round or near-circular lesions appear on both sides of the leaves, and the diameter is 2-3 mm, which is off-white. The late lesions were limited by the veins and showed a polygonal shape. Multiple dark spots were developed on the lesions. The lesions meet each other for a long time, causing the leaves to die. (2) The lesions of the leaves are large and round when infected with the ringworm pathogen. Diameter 5-10 mm, brown, with a concentric wheel weave, many small black spots on the students. (3) When infected by anthracnose, the fading spots appeared on the leaf surface at the early stage of disease, and gradually spread to stems and branches. The epidermis was rough, dark brown, and later the lesions contracted and sunken. The lesions were flooded under conditions of high temperature and high humidity, and the stems and leaves of the plants were withered at later stages.
2. Incidence of disease: In the growing season of Platycodon grandiflorum, a large number of new conidia were transmitted through wind and rain, and repeated re-infection was repeated, resulting in the prevalence of field diseases. General 7-8 months of serious damage. High temperature, heavy rain, and dew-dense weather conditions, extensive management, and poor growth are favorable for disease incidence and prevalence. If the control is not effective, the leaves often die.
3, prevention and control technology: (1) improve the disease resistance of plants, strengthen field management, close planting, pay attention to the timely drainage and dehumidification after the rain. (2) Chemical control: spraying 1:1:100 Bordeaux mixture or 600 times of 2000 to prevent disease; after onset, the following agents can be sprayed according to the type of disease: 80% of Daisen 600 times fluid, 50% Mancozeb 500 times, 50% Thiophanate 600 times, and 50% Carbendazim 600 times. If serious anthrax occurs, use 25% SPK 800x for spraying. Pay attention to meticulous attention when spraying, depending on the progress of the disease and the state of the continuous spray 2-3 times, spray once every 7-15 days.

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