Domestic rose-domestic wild rose is prone to rose powdery mildew. Symptoms are: the young leaves are light gray, the leaves become twisted and covered with a layer of white powder. In severe cases, the leaves wither, the flowers are small and few, and they can't even bloom. Bacteria can also infect flower stems and flower stems.
Pay attention to:
1. Improve the growth conditions of Chinese rose, properly ventilate and transmit light, apply less nitrogen fertilizer and more phosphorus and potassium fertilizer.
2. After pruning in winter, spray 1.02kg/L sulfur agent to kill overwintering bacteria. It can be prevented by spraying 200 times of Bordeaux solution before the onset. Spraying 15% triadimefon wettable powder 1000 times solution or 70% thiophanate-methyl wettable powder 1000 times solution at onset.
Artificial cultivation-wide adaptability, suitable for planting in vast areas of southern China except cold and winter. There are few pests and diseases of wild roses, and insect pests such as sawflies, scale insects, aphids, scorched leaves, canker and black spot often occur in artificial cultivation. In addition to spraying with chemicals, the scenery should be used in coordination with other flowers and trees, and it is not advisable to plant too much in one place. Every winter, pruning old branches and dense branches frequently, keeping light and good ventilation can reduce pests and diseases. Pruning is an indispensable and important process in rose landscaping. If the pruning is not good, it will grow into a pile of thorns and thorns, which are uneven, not only with many pests and diseases, but also unsightly.