Introduction to the symptoms and control methods of honeysuckle powdery mildew

Honeysuckle is a perennial rattan shrub belonging to honeysuckle family. It can be used as medicine in bud or flower opening. Leaves and branches can also be used as medicine. It has the effect of clearing heat and detoxifying. Now many cities and counties in China from south to north have planting. Powdery mildew is a common disease on honeysuckle. It occurs widely in various planting areas of the country and is seriously harmful. Let's take a look at honeysuckle powdery mildew together. How to do it?

Symptoms of honeysuckle powdery mildew

Powdery mildew mainly damages leaves, sometimes stems and flowers. The disease spots on the leaves were white spots at first, then expanded into white powdery spots, and the whole leaves were covered with powdery layer in the later stage. In severe cases, the leaves were yellow and deformed or even deciduous. Stems blotched brown, irregular, with powdery flowers twisted and falling off severely.

The law of honeysuckle powdery mildew

The pathogen of honeysuckle powdery mildew is diaphania japonica, a fungus belonging to subphylum cystomycetes. The pathogen overwinters on the diseased body as ascocarp, releases ascospores in the next year for initial infection, and produces conidia for re-infection after the disease occurs. The disease is easy to occur in warm and dry conditions or in shade between plants. Excessive application of nitrogen fertilizer causes serious disease alternately in dry and wet conditions.

What about honeysuckle powdery mildew?

1. Disease resistant varieties: select disease resistant honeysuckle varieties according to local conditions, and spray tree protection generals for sterilization and disinfection in the field in time to reduce the source of pathogens.

2. Strengthen management: reasonable dense planting, pay attention to ventilation and ventilation, scientific fertilization, increase phosphorus and potassium fertilizer application, improve plant disease resistance, timely spray flower strengthening spirit before honeysuckle bud emergence can promote bud strength, petal hypertrophy, gorgeous flower color, rich flower fragrance, prolong flowering period, timely irrigation, timely drainage after rain, prevent moisture retention.

3. Chemical control: spray 50% colloidal sulfur 100g to 20kg water or 15% triadimefon wettable powder 2000 times solution at the early stage of disease, and spray 800 times solution of new lipid membrane to improve the utilization rate of effective components of chemicals and consolidate the control effect.

The prevention and treatment of honeysuckle powdery mildew

Honeysuckle, is a common herbaceous flower, often used for family courtyard, garden decoration, attracted a lot of flower friends to cultivate. The breeding method of honeysuckle is relatively simple, so, do you know what common diseases of honeysuckle have? How to control honeysuckle powdery mildew? Today, Xiaobian will introduce relevant knowledge in detail for everyone, and learn it together with Xiaobian.

Symptoms mainly harm leaves, sometimes stems and flowers. The disease spots on the leaves are white dots at the beginning, and then expand into white powdery spots. In the later stage, the whole leaves are covered with white powder layer. In severe cases, the leaves are yellow and deformed or even deciduous. The disease spots on the stems are brown and irregular, with white powder on them. The flowers are twisted and fall off in severe cases.

Microsphaera loniceras (Dc.) Wint.in Rabenh. Said honeysuckle fork silk shell, belongs to the subphylum fungi. Ascocarp scattered, globose, dark brown, 65-100μm in size;5-15 accessory filaments, 55-140μm long, 0.7-2.1 times the diameter of ascocarp, colorless, septate or 1-septate, 3-5 times bifurcated. Asci 3-7, oval to elliptic, size 34-58×29-49(μm). Ascospores 2-5, oval, 16.3- 2 - 5 ×8.8-16.3(μm) in size. The anamorphic form is Oidium sp. mycelium, leaves are epiphytic on both sides, conidia are erect, the size is 50-94×7-10(μm); conidia are 2-3 in series, a few are solitary, elliptic, cylindrical, and produced to the basic type, the size is 28-49×12-20(μm).

The pathogen overwinters on the diseased body with ascocarp, and the ascocarp releases ascospores for primary infection in the next year. After the disease occurs, the diseased part produces conidia for secondary infection. Warm and dry or shade between plants is easy to cause disease. Excessive application of nitrogen fertilizer, alternate wet and dry heavy disease.

control methods

1. Select disease-resistant varieties according to local conditions.

2. Strengthen cultivation management, reasonably plant closely, pay attention to ventilation and ventilation; apply fertilizer scientifically, increase phosphorus and potassium fertilizer, improve plant disease resistance; irrigate in time, drain water in time after rain, and prevent moisture retention.

3. At the beginning of disease control, spray 50% colloidal sulfur 100g to water 20kg or 15% triadimefon wettable powder 2000 times.

Commonly used pharmaceutical colloids sulfur, triadimefon

The above is all I know about honeysuckle today, I hope that flower friends will be helpful after reading this article, if you want to know more about honeysuckle related knowledge, please continue to pay attention to the fleshy flower bed, we will provide you with more relevant knowledge!

Control method of honeysuckle powdery mildew

Symptoms of honeysuckle powdery mildew damage: mainly damage leaves, sometimes also damage stems and flowers. The disease spots on the leaves are white spots at the beginning, and then expand into white powdery spots. In the later stage, the whole leaves are covered with white powder layer, and when it is serious, it is yellow and deformed or even deciduous. The upper part of the stem is brown and irregular, and there are white powder on it. The flowers are twisted and fall off when it is serious.

Pathogenesis characteristics: the pathogen overwinters on the diseased body with ascocarp, releases ascospores in the next year for initial infection, and produces conidia for reinfection after the disease occurs. Warm and dry or shade between plants is easy to cause disease. Excessive application of nitrogen fertilizer, alternate wet and dry heavy disease. According to the investigation of plant protection station, powdery mildew began to appear in Zhongling on April 28, the average rate of powdery mildew was 8.9% on May 18, the highest was 40.0%, and the average rate was 17.0% on May 30, the highest was 20%.

Control methods: breeding disease-resistant varieties (all varieties with thick branches, dense nodes and short nodes, thick green leaves and dense villi, mostly varieties with strong disease resistance); reasonable dense planting, shaping and pruning, improving ventilation and light transmission conditions, can enhance disease resistance; applying less nitrogen fertilizer and more phosphorus and potassium fertilizer; applying 15% triadimefon (triadimefon) 1500 times solution or 50% ridoxycycline in the early stage of disease. Manganese zinc 1000 times solution or 75% chlorothalonil wettable powder 800-1000 times solution spray control, once every 7 days, continuous spray 2~3 times.