Powdery mildew of chrysanthemum should be prevented as soon as possible before the Beginning of Autumn can be killed.
Chrysanthemum powdery mildew is one of the common diseases in flowers, which distributes in both south and north of China. Chrysanthemum powdery mildew can lead to poor plant growth, leaf death, or even no flowering, seriously affecting the greening, beautification effect and flower production. Chrysanthemum powdery mildew mainly harms melon, calendula, echinacea, gerbera, cosmos, atterina, dahlia, zinnia, rose, rose, balsam, cherry, okra, poinsettia, hollyhock, begonia, wisteria and so on.
Chrysanthemum: Chrysanthemum to prevent the yellow leaves off the four ways
hazard symptom
At the early stage of chrysanthemum powdery mildew infection, yellow transparent powdery white spots appeared on the leaves, mostly on the front of leaves, mainly damaging the leaves, petioles and young stems and leaves were more susceptible to infection. When the temperature and humidity are suitable, the disease spots can expand rapidly and connect into large areas of white powdery spots or gray powdery mildew layers. In severe cases, the leaves of the disease are chlorotic, chlorotic, tender shoots curly, deformed, premature senescence, stem bending, new shoots stop growing, flowers are few and small, plants are dwarf sterile or do not bloom, and even death occurs.
Pathogen and occurrence rule
The pathogen causing powdery mildew belongs to powdery mildew fungus, which is inulin spore mold, and the sexual segment is powdery mildew. Generally, the pathogen overwinters in the remains of diseased plants or in the soil. When the temperature and humidity are appropriate in the spring of the next year, the ascocarp dehiscence and ascospores are released, and they are transmitted and diffused by airflow and wind and rain. Powdery mildew is most likely to occur when humidity is high, light is weak, ventilation is poor, and the temperature difference between day and night is above 10℃. Generally, powdery mildew occurs frequently from August to October, and seriously from September to October.
control methods
In cultivation, attention should be paid to cutting off over-dense and withered leaves, pulling out diseased plants and burning them or burying them deeply, which can greatly reduce the source of infection. Planting should not be too dense, soil moisture should be controlled, ventilation and light transmittance should be increased, phosphorus and potassium fertilizer should be applied to enhance the disease resistance of plant leaves. To avoid excessive application of nitrogen fertilizer, care should be taken to keep leaves dry when watering. Pot soil or seedbed, soil to use medicine sterilization, with 50% thiophanate-methyl and 50% thiram 11 mixed chemicals 600-700 times spray pot soil or seedbed, soil, can achieve sterilization effect.
Chrysanthemum: Chrysanthemum hydroponics technical method
In the early stage of disease, 50% Garinone WP or 75% Tridecamoline Emulsion 1000 times solution can be sprayed once every 10 days, continuous spraying 3 times can control the occurrence and spread of disease, or 25% Dietrone (Propiconazole) EC 20 ml water 100 kg spray once every 10-15 days, continuous spraying 2-3 times, the control effect is better. In the disease period, 70% thiophanate-methyl wettable powder 32- 48g can be sprayed with 70kg water, sprayed once every 7-10 days, continuously sprayed 2-3 times, or 15% triadimefon emulsion 1500 times solution or 70% thiophanate-methyl wettable powder 800-1000 times solution can be sprayed once every 7-10 days, continuously sprayed 3-4 times to achieve good control effect.
·END·
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