Symptoms occur in northeast China, Inner Mongolia, Gansu, Ningxia, Xinjiang, Hebei, Shanxi, and Shaanxi provinces. Incidence rates range from 50% to 60% in general years, 20% to 25% from roots, and 2-4 degrees from sugar. After the disease, the seed yield was reduced by 30%. At the onset of the disease, there was a sporadic strain, and afterwards there was a continuation of contiguous, severe golden patches. The first leaf or the tip of the old leaf of the diseased plant becomes orange-yellow, and gradually expands toward the center of the leaf, causing yellow patches of varying sizes and shapes between the leaf veins. After the plaque expansion, the whole ji turns yellow, only the veins Keep green. The diseased leaves thickened, became brittle and easily broken, and only the heart leaves remained green and the outer leaves became yellow and dry as far as the whole plant was concerned. At noon midsummer, the leaves drooped and the diseased leaves stood upright. Some late-stage diseased leaves were rotted by Alternaria sp., showing dark brown moldy texture, and leaves withered and curly.
The pathogen Beet mild yel10wing virus, abbreviated as BMYV, is called beet yellowing virus and belongs to virus. The virions are filamentous, with a diameter of 100 nm and a length of 1250 nm. The virus survived in vitro for 2-3 days. Lethal at 52°C for 10 minutes. The dilution limit is 10000 times. In addition to infecting sugar beets, it can also infect spinach, spinach in Central Asia, municipalities, ash green, water fleas, caravans, bian reservoirs, and oysters. Commonly used to identify the hosts are Apricot, Spinach, Kiribis spinosa and so on.
Transmission routes and onset conditions The mother root is the main source of infection. Sugar beet seed poisoning rate is only 0.01% -0.5%, not the main source of infection. Weeds of raw sugar beets that are far from the seed collection area, especially the weeds of the family Cercosides and winter spinach, are important infestation sources. It is mainly transmitted by Myzus persicae and Aphis fabae. Juice friction can also be transmitted. The prevalence of the disease is closely related to the source of the virus, the number of aphids, and the climatic conditions that influence the activity of aphids. Inner Mongolia began to move in late May, with two peaks in mid-July and mid-September. In the middle of June, a central disease strain appeared in the field, which occurred in mid-August and no new strains appeared after September 10. The occurrence of winged peach aphid is an important condition for the epidemic. The growth and decline of the aphid are constrained by temperature, humidity, and rainfall. The temperature of 25°C and relative humidity of 40%-60% facilitate its migration and reproduction. In early July, rainfall could mostly reduce the occurrence and migration of winged plover. On the contrary, the peak of migration of locusts was ahead of schedule, and the amount of migrants was heavy and the incidence was heavy.
Control methods (1) We chose Gongnong No. 2, Inner Mongolia No. 3, Tianyan No. 3 and No. 504 as disease-resistant or disease-resistant varieties. (2) The distance between the mother root zone and the raw sugar beet land is more than 1000m, and the seed collection area is arranged in the downwind. (3) Remove weeds in time to reduce the amount of aphid and the source of poisons. (4) spraying 40% omethoate EC 1000 times or 50% WP WP 2000 times and 10% Imidacloprid WP 2000-3000 before locusts move into beet land in mid-June-July. Double fluid. (5) When the symptoms appear, when continuously appearing, continuously spray potassium dihydrogen phosphate or 20% poisonous nemesis WP 500 times, 0.5% antiviral mushroom proteoglycans 250-300 times, 20% virus Water-soluble powder 500 times, every 7 days, promote the leaves turn green, stretch, reduce the damage.
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Automatic Powder Packing Machine
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