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在美国,柑桔类感染有几种病毒病,包括:鳞皮(Psorosis),佇立待杀(Tristega),苗黄(seedling yellows),木质陷孔(Xyloporosis),裂皮(Exocortis),和叶脉突起(Vein enatian)等。这些病毒病在美国都是慢性病,病树逐渐衰退,没有成片迅速枯死的现象,蔓延也不快。虽然如此,这些病毒病综合造成的损失仍然很大。因此美国农业部门几年前开始采取繁殖无病毒苗木的办法来防止为害。 这项工作主要由加州大学柑桔试验站与加州农业厅和美国农业部合作进行。工作中心是鉴定无病 母本树及培育无病毒苗木。无病母本树的鉴定分国内的和从国外引种两种。
There are several viral diseases in citrus infections in the United States, including: Psorosis, Tristega, seedling yellows, Xyloporosis, Exocortis, and veins Vein enatian and so on. These virus diseases are chronic diseases in the United States, the disease tree is gradually declining, there is no rapid death phenomenon, the spread is not fast. Nonetheless, the combined losses of these virus diseases are still substantial. As a result, the U.S. Department of Agriculture began to prevent the occurrence of virus-free seedlings several years ago. This work is mainly conducted by the University of California Citrus Experimental Station in collaboration with the California Department of Agriculture and the U.S. Department of Agriculture. Work center is to identify disease-free mother trees and nurturing virus-free seedlings. Identification of disease-free mother tree points in domestic and introduced from abroad two.