Once upon a time, 1994, to be precise, the USDA's National Agricultural Statistics Service counted 48,221 acres of citrus acreage in Martin County Florida, most of it in oranges. Now the USDA estimates there's about 2,700 acres left, and most of that — maybe all of it — will go out of production this year leaving 0 aces in 2018 because of Citrus Greening. .