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Flower powdery mildew
Chinese name: powdery mildew Chinese alias: flower powdery mildew, rose powdery mildew, impatiens powdery mildew, chrysanthemum powdery mildew Latin scientific name: Sphaerotheca pannosa, Sphaerotheca fuliginae, Erysiphae cicheracearum, Podosphaera oxyacanthae crop damage: flowers. Powdery mildew can cause roses, roses, roses and other woody flower seedlings to be infected, but also can make chrysanthemum, impatiens, cineraria, phlox and other herb flower seedlings infected. Symptoms of damage: mainly on the leaves, shoots covered with white powder, white powder is the mycelium and conidia of pathogens. The germs absorb the nutrients in the epidermal cells of the epidermis, and a few of them absorb the nutrients from the stomata through the stomata. Severely diseased elbow leaves are not flat and the leaves curl outwards. The leaves fall and die early, and the young shoots bend downwards or die. Incidence characteristics: The pathogen of powdery mildew is a kind of special parasite. On the same kind of plant, it can sometimes be infected by more than one powdery mildew. Roselle powdery mildew (Sphaerotheca pannosa) is a common disease in rose, rose, rose, peach and other seedlings. Rose pink powdery mildew usually overwinters in the dormant buds, diseased leaves, and diseased shoots of mycelia. Conidia are formed in suitable conditions in the next year and transmitted by the wind. When the temperature is 17-25°C and the humidity is high, the disease is heavy, especially when the air relative humidity is 97%-99% at 21°C. Impatiens balsamensis (S. fuliginae) can infect impatiens, zinnias, cosmoses, comats, pansy, hibiscus, roses, melons, etc. Some people believe that S. humuli can infect Impatiens. Alfalfa monofilament shells are diseased at high temperatures and high humidity. Chrysanthemum powdery mildew (Erysiphae cicheracearum) can infect wisteria, cockroach, clam, phlox, bellflower, beautiful cherry, delphinium, hollyhock, chrysanthemum, cineraria, calendula, zinnia, gerbera, golden light Chrysanthemums, dahlias, sunflowers, etc. Seedlings (seedlings) o Some people think that Oidium chrysanthemi is the main pathogen of chrysanthemum powdery mildew, and infects cineraria, gerbera and so on. The powdery mildew of Chrysanthemum was overwintering on the surface of the soil with the closed crust shell and the diseased body. There was no overwintering problem in greenhouses in the south and north. At 20 to 24°C, the disease is most severe when it is air-dried. Inulin powder spores the fruit of the fruit on the victim's tissue, and the fruit of the fruit is cracked. The ascospore is spread by the wind, and the disease becomes severe in mild and dry weather. Hawthorn powdery mildew (Podosphaera oxyacanthae) can infect hawthorn, bay leaf plum, Spiraea, Chinese Spiraea. In addition, there are many pathogens of powdery mildew. Control methods: 1. The resistant varieties were selected for breeding such as rose varieties with high resistance to powdery mildew. 2. Clear the source of the disease and clean up the debris in time and burn it. It is not possible to cultivate seedlings that are susceptible to powdery mildew with bedrock that may contain powdery mildew. We do not need cuttings and ramets of powdery mildew. Avoid prolonged duration of optimum humidity suitable for the growth of powdery mildew. 3. In the early stage of the disease prevention and treatment, the following wettable powder agents are used for prevention and treatment: 25% triadimefon 2000 times solution, or 45% propafenazole 2500-3000 times solution, or 64% antiviral 500 times solution, or 70% thiophanate-methyl 1000 time solution . Spray once every 7 to 10 days. When it happens, it can also use baking soda 500 times, every 3 days, and even spray 5 to 6 times.