Disease mainly powdery mildew. After being damaged, the stems and leaves are distorted and atrophied. After being discovered, they can be removed and destroyed in time, and can be sprayed with 50% carbendazim 500 times. Insect pests are mainly locusts. Can spray selenium 50% dichlorvos 800-1000 times liquid. Other methods of prevention and treatment reference cineraria, a string of red, rose pest control section. White rust prevention and treatment ã€Symptoms】 The diseased parts are mainly leaves, petioles and tender stems, and the affected leaves have pale green spots on the leaves at the initial stage. After gradually becoming pale yellow, the edge is not obvious, and when serious, it expands into a large lesion. The back of the diseased part has a white sickle, and when it breaks, it emits a white powder, which is the cyst spore of the pathogen, when the tender stem is damaged. The flowers and stems are distorted. When the lesions surround the petiole and young shoots, the host parts above the ring cut grow poorly and die. ã€Pathogen and Pathogenesis】 The pathogen is Albugoipomoeae-panduranae, a fungus belonging to the white rust genus. The pathogenic bacteria in the diseased tissue overwintered with oospore. In the spring of the following year, the oocysts germinated to produce sporangia and invade the convolvulaceae plants such as the petunia. Generally, they were at the height of onset from August to September, and the morning glory could be colonized and became One year dip source. Pay attention to the prevention of damping-off during seedling stage, especially the seedling stage. In addition to good disinfection work, dilute sowing, adequate light, good ventilation, suitable temperature and excessive wetness can also greatly reduce the chance of disease. Once the disease occurs, it should be Timely removal of diseased plants, the use of pharmaceuticals such as Precise, Infectious Cream, and root canal irrigation is generally easy to control. When the temperature is high, seedlings must be pre-preserved rot. After the emergence of seedlings is generally not easy to produce diseases, but due to the impact of the cultivation environment can still occur some diseases, gray mold, blight and physiological diseases, etc., should be the main prevention, available carbendazim + streptomycin every 7 to 10 Spray once a day. Once the disease occurs, it must be treated according to the actual situation. Pests should pay attention to the prevention of locusts, red spiders, cabbage caterpillars, especially the prevention and treatment of spotted fly, we must pay attention to observation, in the initial occurrence of insect pests sprayed in a timely manner related agents, generally easy to control. [control methods] 1 timely removal of diseased plants and destruction. To reduce the spread of seeds. 2 Select the remaining disease-free seeds as breeding seeds, and disinfect the seeds before sowing. Avoid rotation with convolvulaceae plants. 3 At the beginning of the disease, spray 1% Bordeaux fluid or 50% Phytophthora under the net 500 times, spraying once every 10 to 15 days has better control effect.
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