Panax notoginseng (Burk.) FHChen Panax pseudonym ginseng Wall. var. notoginseng (Burkill) Hoo & Tseng. Alias ​​field seven. Araliaceae is a perennial herb that uses rhizomes, flowers, and leaves as medicine. It has the functions of activating blood stasis, relieving swelling and pain, and stopping bleeding and reducing blood pressure. For our country Guangxi, Yunnan specialty products, south of the Yangtze River in recent years, Guangdong also has many county production.
Symptoms also known as rot disease, chicken erosion, odor seven. The disease can occur during the three to seven years of the year from birth to the third and fourth year, but it mainly affects the first and second year students. At the time of onset, the leaf color of the shoots turned yellow and the growth potential was poor. When the temperature is high at noon in the early days, the leaves are slightly drooping and can be restored sooner or later. Dig out the diseased plants and become brown or rot in infected roots. The main, lateral, and fibrous roots can all develop diseases. And it is most common to start decaying at the intestines of rhizomes. If only one side of the root rot, sometimes the leaves on the side of the ground turn yellow. In the late stages, the diseased roots became dark brown or gray and muddy. It was called “chicken rotten†and may be related to invading bacteria. Each year from May to August, the onset of heat and humidity is heavy.
The pathogen Fusariμm solani (Mart.) Sacc. f. sp. radicicola (Wr.) Snyd. & Hans. said the eggplant fungal spore root disease specialization, is a fungus of the subphylum Fungi. On the PSA, the aerial mycelium was more developed, and the flora was streaked and densely covered; it was grayish white, and the reverse side of the Petri Dish turned blue-green. The production of microspores is early and many; single birth on small bottle stalks, a variety of shapes, mostly curved oval. The megaspores are produced on multi-branched conidiophores, producing spore-like pedicels; megaspores are not equilateral-spindle-shaped, slightly curved, broad and short; 2-4 segregates, separated by 3 segregation In most cases, the podocyte in the base is not obvious; in general, the second basal cell is the widest; the apical cell is slightly verrucous. Three segregating megaspores 26-405-6 (μm). In addition to the roots that infect the root of Panax notoginseng, the fungus also infects tubers or stem bases of potatoes, tulip bulbs, and konjac tubers.
Transmission routes and disease conditions occur when seeds, seedlings, diseased soil, and diseased bodies carry bacteria through the winter. The soil in the field has heavy viscous weight, poor drainage, and many underground pests, which can easily induce the disease. Especially after transplanting in the third year of the three-year-old, the watering is uneven or not timely, the roots are dry and soft, the soil moisture is saturated, the root hairs are easy to suffocate, and the bacteria invade easily. In March, the emergence period has occurred. In April and May, the temperature rose and dried, and the disease was stagnant. From June to September, it was warm and rainy, and it entered the peak period of onset. The occurrence of the disease is also related to excessive water loss or heat during transport of seedlings. Field soil is too viscous, poor plant growth, resulting in the disease resistance of the root tissue is not strong and easy to disease, the application of nitrogen fertilizer on the production of heavy onset.
Prevention methods (1) Use disease-free healthy seeds and seedlings. (2) Choose a well-drained and loose soil plot to plant 37 plots. (3) More than five years of rotation are used, and generally three or seven consecutive days should not exceed three years. (4) Do a good job of the management of Sanqi Park, timely remove diseased plants or diseased roots, and disinfect the diseased points with lime or pharmaceuticals. In winter and spring, we must prevent it from drying out and dampness, and water in the dry season in a timely manner. Drain the water in time after rain and promote the use of compost that is fermented by enzymes. (5) At the beginning of the onset, watering the roots with 1:2:250-300-fold Bordeaux mixture or 12% green-milk cream EC 600 times has a certain effect.
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