Powdery mildew damages the leaves, shoots, buds and pedicels of the rose. After the tender leaves become sick, the leaves shrink and become deformed. Sometimes they become purple. When the old leaves are sick, the leaves appear nearly round and the water spots are whitish. There is no clear boundary between the leaves and healthy tissues. There is a white object at the lesion. When the disease is severely damaged, the leaves wither and fall off. Young shoots and pedicels are slightly enlarged and their tops are curved toward the ground. Buds cannot be opened after infection, or their flower posture is abnormal. The surface of the affected area is covered with white powder, which is typical of powdery mildew.
Pathogens and the pathogenicity of the pathogen are Rhizoctonia monocytogenes. The mycelium develops on the surface of the host and sucks into the plant epidermal cells to absorb nutrients. Conidiophores short, erect, connate at the top, spores colorless, oval or barrel-shaped, 5 to 10 strings, mainly hyphae in the dormant buds of susceptible plants, winter, next spring When the buds begin to spread, they are covered with white powder. These conidia are spread by the wind to young tissues, germinate under appropriate environmental conditions, and enter the epidermal cells through the stratum corneum and epidermis cell walls for harm.
Powdery mildew is generally susceptible to disease in warm, dry or humid conditions, and rainfall is not conducive to disease occurrence. Excessive application of nitrogen fertilizer, the soil lack of calcium or potassium fertilizer is prone to the disease, plants too dense, poor ventilation and light transmission, serious illness. Severe changes in temperature and over-drying of flower pot soils will reduce the turgor pressure of the host cells, which will weaken the plant's ability to resist disease, which is conducive to the occurrence of diseases.
Control methods
1. Strengthen the cultivation and management, pay attention to soil wet and timely watering; reasonable fertilization, nitrogen fertilizer should not be too much, should be properly increased potassium, calcium fertilizer, in order to enhance plant growth, maintain robust plants, itself is resistant to the cultivation techniques of natural bacteria Invasion. Timely pruning, removal of diseased and diseased leaves, and improvement of ventilation and light transmission conditions between plants. The indoor potted rose should be placed in a well-ventilated and well-lit place. In winter, indoor temperature and humidity should be controlled, and ventilation should be paid attention at night. Before moving into the greenhouse in the late autumn and early winter, it should be carefully examined and the diseased leaves and the diseased tip should be immediately cut off and burned so as not to bring it into the room to spread.
2. Chemical control: Powdery mildew is a common disease in rose, so special attention should be paid to the prevention and management of seedling pests and diseases. Prior to planting large and small seedlings, disinfection should be done according to the actual conditions of the greenhouse and soil. 3 to 4 degree lime sulfur can eliminate overwintering bacteria in the bud scale; 500-800 times of mancozeb, chlorothalonil, carbendazim and thiophanate are alternately used in the spring growing season (Bordeaux liquid, stone Sulfur synergists are also acceptable). In the onset period, it can spray 70% thiophanate-methyl 1000 to 1500 times, or 15% triadimefon 1000 times, or Guoguang triadimefon, Guoguang Yingna, etc. have good control effect. The residual period of triadimefamide can reach 20 to 25 days. After spraying, the white powder layer of the affected area becomes dark gray, shrinking and disappearing. Huangmei and autumn rain are the peaks of onset, and the occurrence of hot and humid rains in summer is also very strong. During this period, the interval between application is shortened. Spray Note: Generally 8am-10am, 4-7pm. Sunny windless spraying is preferred.
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