Taraxacum mongolicum Hand. -Mazz. Also known as Huang Lang, milk grass. Is a perennial herb of the Asteraceae family. Root and whole herb medicine. With heat detoxification, elimination of phlegm effect. Most parts of the country are distributed.
Symptoms mainly affect the leaves. The sparse white powdery mildew on the surface of the leaves was generally not obvious. Later, the spots expanded and the layer of mold increased. At the later stage, the leaves were full of small black granules, that is, the closed shell of the pathogen.
Pathogen Sphaerotheca fusca (Fr.) Blμ. called brown silk monocystic shell, belonging to Ascomycota subphylum fungi. The mycelium is born on both sides of the leaves. The fruit of the ascoma is born on the leaves and scattered. When born on the petiole, stem and calyx, it is dilute, brown to dark brown, spherical or nearly spherical, with a diameter of 60-95μm, with 3- 7 affiliated filaments, inserted below fruit of capsule, growing 0.8--3 times as large as capsule fruit, with 0-6 septa, containing 1 ascarina; ascaria oval or ovate, few with short stalk, Size 50-9550-70 (μm), containing 8 or 6-8 ascospores; ascospores oval or oblong, size 15-2012.5-15 (μm).
Transmission Pathway and Pathogenic Conditions The pathogens remain in the surface of the surface with the closed capsular shell to survive winter, and ascospores are emitted from April to May of the following year, causing initial infection;
After spreading to the healthy leaves, as long as the conditions are suitable, the spores will germinate, and the invading silk will directly invade the epidermis cells of the pupa pupa. The sucking cells will absorb nutrients in the epidermal cells, and the hyphae will fall on the leaves. In the late fall, the closed capsular shell is again formed in the diseased part.
Control methods (1) When planting Pugongyu artificially, it is necessary to apply reasonable fertilizers to avoid partial nitrogen fertilizers, increase phosphorus and potassium fertilizers, promote plant growth, and enhance disease resistance. (2) Care should be taken after the harvest to clean the pastoral areas, and the sick and corpses should be buried or burned. (3) Begin spraying 60% anti-mildew Po 2 water-soluble powder 800-1000 times or 50% carbendazim wettable powder 600-700 times, 40% Miconazole suspension 600-700 times, 50% Benomyl wettable powder 1500 times, all have better results, if necessary, can also be used 20% triadimefon EC 2000 times, 40% Fuxing EC 9000 times, in the early onset of spraying, about 20 days 1 Times, you can get results. The drug was stopped 7 days before harvest.
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