First, the onset of symptoms. Rapeseed virus disease can develop from seedling stage to pod stage, but the symptoms of different types of rape vary greatly. 1, campestris and Brassica juncea: onset seedling performance of mosaic type. The typical symptoms begin with the base of the veins of the heart, chlorotic along the sides of the veins, appear semitransparent, and later develop into a mosaic, with shrinkage and dwarfing. The onset of convulsions, stem shortening, distortion, flowers and pods intensive. Those who are mildly ill tend to mature prematurely, or fail to bloom, or are dense, deformed, lack seed grains, and have reduced oil content. Disease-heavy plants can die. 2. Brassica napus: Leaf symptoms are macular, faecal, and mosaic symptoms. 1 Macular diseased plants: Nearly round yellow spots are scattered on the leaves of the seedling stage, brown dry spots appear in the center of the macula afterwards, dense chlorotic dots are generated on the fresh leaves of the convulsive stage, and the spots are yellow or positive. Yellow-green, with a small brown spot on the center of the yellow spots on the back, and brown streaks on the stems and pods. The pods are twisted and the leaves fall off early. 2 Faecal-type diseased plants: There are brown-colored spots on the leaves of the seedling stage, and dead and dead on both sides. Some veins and petioles produce dead brown stripes, and diseased plants easily die. After twitching, brown streaks were also found on stems, pedicels, and indigo. The onset was later. 3 mosaic type diseased plants: mainly on new leaves, similar to cabbage-type rape. Branches show veins, leaves appear leafy and shrink. Stems produce dark brown streaks, dwarfing and deformed plants, short stems, clusters of flowers and fruit, and short and twisted pods. Sometimes they resemble chicken feet. There are tiny dark brown spots on the pods, which are poorly stout or not strong. Heavy whole plant died. Second, prevention and control. The key to prevention and control is to prevent disease at the seedling stage. 1. Selection of Disease-Resistant Varieties: The common rapeseed rape has stronger disease resistance than the mustard and cabbage-type oilseed rape, and the yield is high. The difference in resistance between the same types of rapeseed varieties is also significant, and varieties with strong resistance to local cultivation should be selected. 2. Timely sowing: The incidence of virus disease in the rapeseed development stage in winter rapeseed area will decrease with the delay of sowing time, which is mainly due to the decrease of monthly average temperature affecting the number of aphids in the seedling stage, thus reducing the degree of disease damage. It is necessary to determine the sowing date according to the local climate, the characteristics of rapeseed varieties and the occurrence of rapeseed locusts, not only to avoid the peak period of locusts, but also to prevent late sowing and production reduction. In the reporting period of rapeseed disease, the sowing date should be delayed by 10-15 days. 3, strengthen the cultivation and management: to strengthen seedling management, nurturing strong seedlings, and enhance resistance. Do Miao Fei Shi foot, apply early, to avoid partial application, late application of nitrogen fertilizer; combined with cultivator weeding, thinning, Dingmiao, pull out weak seedlings, diseased seedlings. At the same time, when the seedbed soil is dry, it is necessary to pay attention to timely irrigation to control the damage of aphids. In addition, the selection of rapeseed beds should be kept away from cruciferous vegetable fields, peach trees, and weeds that are parasitic to the poisonous source, so as to avoid frequent migration and drug use. High stalked crops can be planted around the seedbed to reduce the migration of winged grasshoppers. 4. Control locusts and control virus transmission: Thoroughly controlling lice is the key to preventing rape virus disease. Before sowing, the cruciferous vegetables around the seedbed and the aphids on the weeds should be sprayed and controlled to reduce the virus source. Before the emergence of rapeseed, it is very sensitive to virus disease before the emergence of the leaf stage. Once it is found, it is necessary to start spraying and remedy the disease. Use 50% of the fog or 50% anti-inflamy WP 2000 times, or use 10% imidacloprid Wet powder 1500 times, spray once every 10 days, spray 2-3 times continuously. Special attention should be paid to the fact that, after the harvesting of vegetables such as Solanaceae and Cucurbitaceae, if they are found to move, they should be sprayed with a quick-acting insecticide, such as 4.5% beta-cypermethrin EC 2000-3000 times, to quickly control the aphid. . A yellow plate was used to trap the winged beak. Hanging or flattening around the seedbed with silver-gray plastic film can repel and prevent it from moving onto the rape seedlings. The use of locusts, parasitoids, grasshoppers, pupa and various ladybugs to treat lice, cut off transmission vectors.
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Below image as a reference:
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Occurrence and Control of Rape Virus Disease
Rape virus disease, also known as rapeseed mosaic disease, occurs in rapeseed production areas. Cabbage-type, mustard-type, early-maturing rapeseed fields and autumn drought are susceptible to disease.