Symptoms of disease resistance of Chrysanthemum showed mild mosaic or non-obvious disease after infection. In susceptible varieties, significant mosaic symptoms or necrotic lesions could be formed and brown spots were produced severely. (right)
The pathogen Chrysanthemum virus B is called chrysanthemum B virus and it is a virus. The virions are in the shape of a line, with a length of 69012 (μm), a lethal temperature of 60 to 65°C, an in vitro survival period of 1 to 6 days, and a dilution point of 100 to 1000 times. Systemic infestations include chrysanthemum, chrysanthemum, cineraria, and garland chrysanthemums. Wait.
Transmission Pathways and Pathogenesis Chrysanthemum B virus is transmitted by sap and cuttings, and the virus-borne coals mainly include Myzuspersicae, Macrosiphumeu phorbiae and other aphids for non-persistent transmission.
Prevention and control methods (1) Diseased chrysanthemum is a virulence body, and strict quarantine is required when introducing it, so as to prevent human transmission to a disease-free area. (2) Prevention and control of drug-borne mites, spraying 50% anti-inferiority WP 2000 times. (3) Strips from disease-free plants are used as propagation material. Conditional use of stem tip tissue culture for detoxification, potted potted chrysanthemum can be placed at 36 °C conditions for 21-28 days, can be detoxified. After the heat-treated chrysanthemum is produced, the virus has been passivated and can be used as a propagation material. (4) In the process of maintenance and management, avoid artificial transmission of drugs. (5) If necessary, spray 5% Sclerotinia WP 400 times solution or 20% venom potassium (Morpholine hydrochloride) WP 500 to 600 times, 0.5% antitoxic agent No. 1 water 300 times Liquid, 20% virus Ning water-soluble powder 500 times, every 7-10 days 1 times, even defense 3 times. The drug was stopped 3 days before harvest.
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