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Symptoms The disease mainly occurs on leaves and shoots. It usually begins in June, after July the leaves are covered with white powder. Subsequently, small yellow dots were formed in the white powder layer, gradually darkened, and finally dark brown.
Pathogens of pathogenic bacteria overwinter in diseased plant residues and seeds. In the following year, when the environment was suitable, the germs spread by wind and rain. From August to September, the onset of disease.
Control methods
1. Planting is not dense, proper ventilation, strengthen fertilizer and water management, and enhance plant resistance to disease. The diseased leaves and diseased plants will be removed and destroyed centrally to reduce the source of infection.
2. During the onset of disease, 15% triadimefon 1000-1200 times, or 70% thiophanate-methyl WP 1000 times. Avoid spraying at high temperatures above 32°C to avoid phytotoxicity.
Second, Impatiens brown spot
Impatiens brown spot, also known as windspot leaf spot, occurs in all parts of China.
Symptoms and diseases mainly occur on the leaves. Foliar lesions are initially light yellow-brown in color, and later expand into a round or elliptical shape. After that, the center becomes light brown with brown edges and inconspicuous bands. On severely diseased leaves, the lesions are contiguous, causing the leaves to become yellow until the plants die.
Pathogenic bacteria live overwintered on windblown disease debris and soil plant debris. In the following year, when the environmental conditions are suitable, the germs will spread by wind and rain. High temperature and rainy season, easy to attack.
Control methods
1? Impatiens like fertile sandy loam, impatient. Therefore, planting with sandy loam is preferable to facilitate drainage; potted impatiens should be poured in time after rain. At the end of autumn, diseased leaves and diseased plants should be centrally destroyed to reduce the source of infection in the coming year.
2? Early onset of treatment with 25% carbendazim WP 300 to 600 times, or 50% thiophanate-methyl 100 times, or 75% chlorothalonil 1000 times.
Three, Impatiens Blight
Symptoms of the disease mainly invade the roots and stems, and the diseased parts become dark or contracted. When wet, white moulds grow on the plants. After the plants became infected, they saw the leaves wilting and dried out in a few days, which in turn caused the death of the whole plant.
way for spreading
1? Mainly in the form of mycelium or sclerotium in the soil or in the body of the disease overwintering, the soil in the mycelium rot to live life, do not sleep.
In the field, the main contact infection, that is, the plant's roots, stems, leaves contact with the soil, it will be infected by soil in the mycelium, under the conditions of the water film, contact with the disease Department of the healthy leaves that Infected. In addition, the spread of diseases can be spread by seeds, tools, and compost.
Prevention and control methods After the disease is removed in the initial stage, spray 75% chlorothalonil wettable powder 600 times, or 60% more WP wettable powder 500 times, and 20% chlorhexidine phosphate 1200 times.
Impatiens common disease prevention and treatment
I. Impatiens powdery mildew
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