How to prevent honeysuckle powdery mildew
Honeysuckle Lonicera japonica Thunb. Alias ​​honeysuckle, is a perennial shrub of the honeysuckle family. In the 60s, it began to change from wild to domestic species. Now from the north to the south, many cities and counties have planted them, once they have a large area. Powdery mildew is a common disease on honeysuckle, which occurs extensively in various planting areas throughout the country and causes serious damage. Symptoms mainly harm the leaves and sometimes also harm stems and flowers. The lesions on the leaves were white dots at the beginning and expanded to white powder spots. The whole leaves were covered with white powder during the late period. In severe cases, the leaves were yellow and even deciduous; the lesions were spotted brown and irregularly shaped with white powder on the stems. The flowers are twisted and fall off when severe. The pathogen Microsphaera lonicerae (Dc.) Wint.in Rabenh. is known as L. forskina, belonging to the fungus Ascomycotina. Ascospores scattered, spherical, dark brown, size 65-100μm; 5-15 appendages, 55-140μm long, 0.7-2.1 times the diameter of the ascospores, colorless, without septate or with 1 diaphragm, 3-5 Double bifurcation. Ascospora 3-7, ovate to elliptic, size 34-5829-49 (μm). Ascospores 2-5, elliptic, size 16.3-258.8-16.3 (μm). The anamorphic state is Oidium sp. mycelium, which is on both sides of the leaves. The conidial stem stands upright, the size is 50-947-10 (μm); the conidia are 2-3 bunches, a few solitary, oval, barrel , Generated to base type, size 28-4912-20 (μm). The onset of pathogenic bacteria in the ascaria shell on the sick body overwintering, the year of asthenia capsule release of ascospores for the initial infection, the disease after the onset of the disease to produce conidia for reinfection. Warm and dry or susceptible shade between the lines. Excessive application of nitrogen fertilizer, alternating wet and dry disease. Control methods 1, according to local conditions, select disease-resistant varieties. 2, strengthen the cultivation and management of a reasonable close plant, pay attention to ventilation; scientific fertilization, increase phosphorus and potassium fertilizers, improve plant resistance to disease; timely irrigation, timely drainage after rain, to prevent moisture retention. 3. In the early stage of the disease prevention and control, spray 50% colloidal sulfur 100g water 20kg or 15% triadimefon WP 2000 times. Common agent colloidal sulfur, triadimefon
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