1. Symptoms: Mainly manifests the symptoms of bean mosaic. The symptoms are first expressed on the new leaves, showing veins, chlorosis, or shrinkage. The leaves show mosaics. In the chlorotic parts of the leaves, the mesophyll protrudes or sinks into a pocket. The leaves are usually Bending down or deformed. The diseased plant grows slowly, with less flowering and less scarring. Fruit pods rarely show symptoms, but pods of severe strains also produce yellow spots or deformity.
2. Infectious Pathways and Pathogenesis There are four major viruses that cause bean mosaic virus.
(1) Common bean mosaic virus: The host range is limited to the leguminous plants near the edge of kidney bean, and the seed disease rate is as high as 30--50%, which is mainly transmitted by pods and peach pods. Juice friction can spread disease. The soil is non-toxic.
(2) Bean yellow mosaic virus: The host range is more extensive. Vectors are mainly pea pods, bean pods, and peach pods, etc., which are rubbed by juices. The seeds are not sick and the soil is not poisoned.
(3) Cucumber Mosaic Virus: A broad range of hosts, mainly the bean pathogen of the cucumber mosaic virus, which is caused by the aphid-transmitted virus. The seeds are not sick and the soil is not poisoned.
(4) Peanut Dwarf Virus: It is transmitted from poisonous peaches and bean pods. The seed transmission rate is low and the soil is not transmitted.
The initial virus infection mainly comes from the infected seeds and the source plants, which are sucked by the aphids. Aphids can be poisoned by taking 1-5 minutes on diseased plants. The bean yellow mosaic virus worms need only be sucked for 15 seconds and become poisonous. Poisonous locusts are transferred to plants for smoking, and they are usually transmitted within 1-5 minutes. The bean yellow mosaic virus is spread in just 15-30 seconds.
The severity of bean mosaic disease was related to the number of aphids and migration. In addition, the temperature also directly affects the symptoms of symptoms, high temperature (26 °C) mostly heavy leaves, dwarfing and leaf rolling, at about 18 °C, only light mosaic, more than 28 °C or below 18 °C symptoms Suppressed.
3. Prevention: Selection of anti-viral varieties. Set up a virus-free planting field and leave seed from a disease-free plant. Seed disinfection, strengthen fertilizer management, unplug and destroy diseased plants, control aphids.
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