Impatiens powdery mildew
Symptoms the disease mainly occurs on leaves and shoots. It usually begins in June, and the leaves are covered with white powder layer after July. Subsequently, small yellow dots were formed in the powder layer, and the color gradually darkened, and finally showed dark brown.
The pathogens overwintered in the remnants of diseased plants and seeds. The following year, when the environment is suitable, the germs spread by wind and rain. The peak period of disease is from August to September.
Prevention and cure method
1. Planting is not too dense, proper ventilation, strengthen fertilizer and water management, enhance plant disease resistance. Remove diseased leaves and diseased plants and destroy them centrally so as to reduce the source of infection.
two。 During the onset of the disease, 15,000,1200-fold solution of the wettable powder, or 1000-fold solution of 70% methyl topiramate wettable powder were used for prevention and treatment. Avoid spraying at a high temperature above 32 ℃ to avoid drug damage.
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Henna balsamina
Scientific name: Impatiensbalsamina English name: GardenNalsam alias: nail grass through bone grass buttercup flower sprinkling goldfish flower urgent peach family name: Impatiens genus name: Impatiens genus adaptive region: originated from China, India and Malaysia, widely cultivated in the middle and south of China. Ecological classification: herbaceous plants 2012 flowers ornamental classification: flowering morphological characteristics: annual herbs, plant height 30-60cm. Stem fleshy, reddish brown or light green, often associated with flowers
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Impatiens powdery mildew and brown spot
Powdery mildew symptoms: mainly harm leaves, flowers and stems can also be damaged. Round white mildew spots first appeared on the leaves of impatiens, which generally began to occur in May. After June, the disease spots expanded or multiple disease spots were connected into pieces, each layer thickened to form a white powdery mildew layer, and mildew layers could be produced on the front and back of the leaves. In early autumn, yellow dots were formed in the powder layer, and then gradually deepened and finally dark brown. In serious cases, the leaves died and fell early. Pathogen and occurrence regularity: the subphylum of atomic cysticercus, powdery mildew caused by monofilament. Son
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