Prevention and Control of Powdery Mildew in Chrysanthemum
Chrysanthemum is not only an ornamental flower but also a commonly used medicinal material. In recent years, powdery mildew often occurs during artificial cultivation. The disease is most likely to occur when the humidity is high, ventilation is poor, and the temperature difference between day and night is above 10°C. Generally, the powdery mildew is frequent from late August to October, and the severe onset is from September to October. After the onset of disease, it can lead to poor plant growth, dead leaves, or even no flowering, which seriously affects the effect of greening, beautification, and medicinal use. It must be prevented and treated in time.
Symptoms: In the early stage of chrysanthemum powdery mildew infection, yellow transparent white spots appeared on the leaves. Most of the leaves were positive, which mainly harmed the leaves. The petiole and young stems and leaves were also susceptible to infection. When the temperature and humidity are appropriate, the lesion can be rapidly enlarged and connected to a large area of ​​white powdery spots or gray moldy layer. In severe cases, the diseased leaves chlorosis, yellowing, tender shoots, deformity, premature aging, stem curvature, new shoots stop growing, flowers are small and small, plants dwarf sterility or no flowering, and even death.
Control methods: 1. In cultivation, attention should be paid to the removal of excessively dense and yellow foliage and increase the ventilation and light transmission in the field. The diseased plants should be removed and burned or buried deeply to reduce the spread of the disease. 2. Control the soil moisture, increase phosphorus and potassium fertilizers, enhance the disease resistance of plant leaves, avoid excessive application of nitrogen fertilizer, pay attention to keep the leaves dry when watering. 3. Potted soil or seedbed, field soil to use drugs to sterilize, can be used 50% thiophanate-methyl and 50% thiram 1:1 mixture of 600 to 700 times liquid spray. At the beginning of the disease, 50% Garnett WP or 75% triclopyrazole 1000 times solution was sprayed once every 10 days and sprayed 3 times to control the occurrence and spread of the disease. In the epidemic period, it can be sprayed with 15% triadimefon emulsion 1500 times or thiophanate-methyl wettable powder 800 to 1000 times, every 7 to 10 days, even spray 3 to 4 times, with good control effect.
Astragalus Membranaceus, also known as Mianqi. Herbs perennial, 50-100 cm tall. The main roots are thick, woody, often branched and gray-white. Stems erect, upper branched, finely angled, white pubescent. Herbs perennial, 50-100 cm tall. It is produced in Inner Mongolia, Shanxi, Gansu, Heilongjiang and other places.
The medicinal use of Astragalus membranaceus has a history of more than 2000 years. It has the functions of enhancing immune function, protecting liver, diuresis, anti-aging, anti-stress, antihypertensive and a wide range of antimicrobial activities. However, it is forbidden to use the evidence of excessive superficial pathogenic factors, stagnation of qi stagnation and dampness, stagnation of food accumulation, excessive heat and toxicity at the beginning of carbuncle or after ulcer, and excessive Yin deficiency and yang.
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