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柑桔是商品价值很高的水果,世界年产量约计5,400万吨。我国1985年年产约200万吨,南方14个省市可以发展柑桔,不少地方证明发展柑桔生产是山区农村致富门道之一。然而,柑桔病毒病及类病毒病的危害很大,已蔓延于全世界,目前经正式鉴定已确认有15—20种此类病害。广东省汕头地区的椪柑、蕉柑,每年因黄龙病枯死40万株;裂皮病已在四川、湖南、广西、广东、浙江、福建、湖北蔓延;青果病在广西亦很猖獗。这些
Citrus fruits are high-value commodities and the world annual output is estimated at 54 million tons. In 1985, China produced about 2 million tons of citrus per year. Fourteen provinces and municipalities in southern China can develop citrus fruits. Many places have proved that the development of citrus production is one of the cornerstones for rural affluence in mountainous areas. However, citrus virus diseases and virus-like viruses are very harmful and have spread all over the world. Currently, 15-20 such diseases have been identified through official identification. Citrus sylvestris and banana in Shantou, Guangdong Province, each year 400,000 due to the yellow dragon’s disease died; split disease has spread in Sichuan, Hunan, Guangxi, Guangdong, Zhejiang, Fujian and Hubei; green fruit is also rampant in Guangxi. These ones