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. The pathogenic nematodes are male and female, and the larvae are in the shape of slender worms. The male adult is linear, the tail end is slightly round, colorless and transparent, and the size is 1. 0-1. 5 × 0. 03-0. 04 mm. The female adult is pear-shaped, and each female nematode can lay 300,800 eggs. Most of the female worms are buried in the host tissue, ranging in size from 0.44 to 1.59 × 0.26 mm.
The route of transmission, disease conditions and control methods can be seen in towel gourd root-knot nematode disease.
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Leaf rot of medicinal plant Panax notoginseng
Symptoms can affect all aerial organs except the roots. The most typical symptom is to cause black fusiform lesions on the top of petioles. When the temperature is high, they quickly circle around the petioles and quickly expand to the base of the leaflets, forming pale black water-soaked lesions on the leaves with irregular edges. The diseased part of the petiole softens quickly, causing the upper leaflet to droop (commonly known as "twisted footwall"). In the disease often visible yellow with pink mold, that is, the fruiting body of the pathogen. When it damages the middle part of the leaf, it forms black irregular spots with irregular edges.
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Anthracnose of Panax notoginseng (Panax notoginseng)
Symptoms can occur in both seedling stage and adult stage, and the disease in seedling stage can cause sudden collapse or top withering. The disease in the adult stage is mainly harmful to leaves, petioles, stems, flowers and fruits. Leaves infected with primary round or nearly round yellow-brown disease spots, obvious reddish brown edge, easy to rupture and perforation in the later stage. The petiole and stem are infected with fusiform yellow-brown sunken spots, causing the petiole to bend or the stem to twist. Damage to the stem base causes adult plant lodging or rhizome rot. The phenomenon of dried flower seeds appeared when pedicel and disk were infected. The fruit is also infected with nearly round yellow sunken spots, causing the fruit to turn brown and rot.
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