Honeysuckle powdery mildew

Causes of Powdery Mildew

The pathogen overwinters in the form of ascocarps on diseased remains. The following year, the ascocarps release ascospores for initial infection. After the onset of the disease, the diseased parts produce conidia for secondary infection.

The disease is more likely to occur in warm and dry conditions or in shaded areas.

Excessive application of nitrogen fertilizer and alternating dry and wet seasons will cause serious disease.

Honeysuckle powdery mildew symptoms

Damage mainly occurs to leaves, but sometimes also to stems and flowers. The spots on the leaves are initially small white dots, then expand into white powdery spots. In the later stage, the entire leaf is covered with a white powdery layer. In severe cases, the leaves turn yellow and deform or even fall off. The spots on the stems are brown, irregular in shape, and covered with white powder. The flowers are twisted and fall off in severe cases.

Honeysuckle powdery mildew prevention and control methods

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

2. Strengthen cultivation management, plant at a reasonable density, and pay attention to ventilation; apply fertilizers scientifically, increase the application of phosphorus and potassium fertilizers, and improve the disease resistance of plants; irrigate at the right time, drain water in time after rain, and avoid moisture retention.

3. Use pesticides for prevention and control. At the early stage of the disease, spray 100 grams of 50% colloidal sulfur diluted with 20 kilograms of water or 2000 times of 15% ketone wettable powder.