Leaf rot of medicinal plant Panax notoginseng
Symptoms the disease can damage all aboveground organs except the root. The most typical symptom is to cause a black fusiform spot at the top of the petiole, which quickly circles the petiole when the temperature is high and quickly expands to the base of the leaflet, forming a light black water-immersed spot on the leaf with irregular edges. The diseased part of the petiole soon softens, causing the upper lobule to droop (commonly known as "twisting the lower plate"). Yellowish pink mildew, the fruiting body of the pathogen, is often seen in the disease department. In order to harm the middle of the leaf, black irregular disease spot is formed, the edge is irregular, the size is generally 5-13mm, the disease part is rotten, the edge is neat when dry, the middle is easy to fall and form holes; the flower cluster is vulnerable, the symptom is the same as the petiole damage; when the stem is damaged, it forms a black-brown fusiform disease spot, but expands slowly.
Verticillium μ mcinnabari μ m (Cda.) ReinkeetBerth. It is called Cladosporium verticillium, which belongs to the subphylum fungus. On PDA medium, the mycelium was initially white and then orange-yellow; the hyphae were slender, nearly colorless, 1.6-2.2 μ m in diameter, separated and could be clustered into bundles; the conidiophores in the mycelia could be clustered together, and the conidiophores were obviously different from the hyphae, 40-82 × 1.4-1.7 (μ m), branching at an acute angle of 30-40 °, branching for 3 times, 6 pedicels on the branches, whorled, 9-13 × 1.4-1.7 (μ m). Conidia ovoid or long oval, sometimes slightly curved, unicellular, colorless, with a large number of conidia, the size of which is 3Mel 7 × 2Mel 3 (μ m).
The route of transmission, incidence conditions, prevention and treatment methods see Datura verticillium wilt.
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Prevention and Control of Diseases and insect pests of Panax Notoginseng
1. The disease 1.1 Black spot mostly occurred in the high temperature and humid season from June to July, which caused the plant to break and die. The prevention and control method is to adjust the transmittance of the shade to less than 20%, and spray with 1.5% more than 150 times of antimycin or 700% chlorothalonil wettable powder 600 times 800 times. 1.2 Blight is a destructive disease in the seedling stage of Panax notoginseng. Most of them occur from June to July, harming leaves and petioles. The prevention and control method is to strengthen the field management, reduce the temperature and humidity, remove the remains in time, burn them centrally, and spray them with 65% Dysen zinc wettable powder 500 times.
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Root knot nematode disease of medicinal plant Panax notoginseng
After the root of Panax notoginseng was invaded by nematodes, the cells of the roots were stimulated by nematodes, the nodule worms of different sizes were produced, the main roots or lateral roots could be distorted and formed tumors, the small 1-2mm and the large ones could turn the whole root into a tumor, and the branches and leaves of the plant turned yellow or fell off after a long time of infection. The pathogen Me10idogyneincognita (KofoidetWhite) Chitwood is called southern root-knot nematode. Dioecious, larval of pathogenic nematodes
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