世界各国的柑桔类无不受各种危险性病虫,如溃疡、疮痂、炭疽、鳞皮、爆皮、斑黄、伫立剎等病害和红蜘蛛、锈壁虱等害虫以及其他病虫的为害。我国各地的柑桔类亦不例外。华南地区的柑桔类则除了受上述各种病虫的为害外,还受两种独特的毁灭性病宮,即黄龙病和青枯病的摧残。这些病虫基本都是由苗木传播的。黄龙病是一种病毒病。对此病的防治,1956年曾提出实施检疫、培育无病苗、挖除病株等措施,已收到一定效果。但在选无病母树,培育无病苗 All kinds of citrus in the world are affected by various pests and diseases such as ulcer, scab, anthrax, squamous skin, skin burst, spot yellow, standing brake and other pests and other pests such as red spiders, rust ticks and other pests and diseases . Citrus fruits around our country are no exception. In addition to the pests and diseases mentioned above in southern China, citrus fruits are also affected by two unique types of devastating sexually transmitted diseases, the yellow dragon’s disease and bacterial wilt. These pests and diseases are basically spread by seedlings. Huanglong disease is a viral disease. The disease prevention and control, in 1956 had put forward the implementation of quarantine, nurturing disease-free seedlings, digging diseased strains and other measures, has received some results. But in the election disease-free mother tree, nurturing disease-free seedlings