Medicinal Plant Isatis Indigotica
Banlangen isatis indigotica Fort. is a biennial herbaceous medicinal plant of the family Brassicaceae. The leaves are called Fokieba, and the root is called Radix. There is heat and cooling blood, swelling and detoxification effect. Hebei, Henan, Anhui, Hubei, Jiangxi, Shandong, Zhejiang, Shanghai and other provinces (cities) have cultivated.
At the onset of symptoms, yellow-white to yellow spots are not evident on the edges of the leaves. When expanded, they are limited to a polygonal shape to an irregular shape by the veins. When the humidity is large, a grayish-white wet mildew is produced on the back surface of the leaves, that is, spores of pathogenic bacteria. The cysts and sporangia.
Pathogen Peronospora isatidis Gaμm. Indica glume is a flagellin subphylum. Two or four cysts extending out from the stomata of the leaves are bundled or solitary, colorless, 192–4328–10 (ftm) in size, branched from top to bottom for 4–7 times, and the last branchlets are short and are just below. Slightly curved, mostly at right angles, with a sporangia. Sporangia oval, unit cell, light brown, smooth surface,
No significant papillary protrusions, size 16-3014-21 (μm).
Transmission routes and pathogenic conditions The oocysts stayed in the soil with the diseased bodies to survive the winter, and the late springs sputtered on the leaves through rain, leading to initial infection and reinfection. Rainy days and high humidity in the fields help spread the disease. The southern part of the country began in late March and entered the peak of onset in mid-April.
Control methods (1) Pay attention to clear the litter in the field. (2) Rotation. (3) Drain the water immediately after rain to prevent moisture from staying. (4) Spray 75% chlorothalonil WP 600 times or 90% EB aluminum wettable powder 500 times and 72% Dupont WP wettable powder 800 times in the initial stage of disease.
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Methanesulfonic Acid Nmr,Methanesulfonic Acid Density,Sodium Dimethyldithiocarbamate
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