四、育苗 柑桔业是佛州的三大经济支柱产业之一(其余两项为磷矿开采业和旅游业)。该州的柑桔业在历史上曾两度因危险性病害(一次是衰退病,另一次是溃疡病)几乎被毁。为了防止类似情况的再度发生。美国农业部与佛州政府对该州的柑桔育苗业非常严厉地进行控制与监督。首先是用新品种注册制度控制新品种的引种和推广,不论是本地选育还是从外地引入的新品种,必须交由美国农业部种植业局进行脱毒处理和至少3年以上的栽培性状观察,才能给予注册并正式推广。一旦发现使用或繁殖未经注册的品种,不论来自其他州或其他国家,轻则限令销毁 Fourth, nursery citrus industry is one of the three major economic pillar industries in Florida (the remaining two for the phosphate mining industry and tourism). The citrus industry in the state has been nearly twice destroyed in history by dangerous diseases, one for recession and one for ulcer disease. In order to prevent the recurrence of similar situations. The U.S. Department of Agriculture and the Florida government control and supervise the state’s citrus nursery industry very severely. The first is to use the new variety registration system to control the introduction and promotion of new varieties. Whether it is locally bred or introduced from abroad, it must be submitted to the USDA Planting Bureau for detoxification and at least three years of cultivation traits observation In order to give registration and formal promotion. Once it is discovered that the use or breeding of unregistered breeds, whether from other states or other countries, orders the destruction