Florida oranges had their worst crop in 70 years. They're facing a deadly disease called citrus greening, spread in the body of the invasive Asian citrus psyllid. Today, nearly every citrus grove in Florida is infected with the disease. If an orange tree were to remain untreated, the disease would block its ability to get nutrients and kill it within a few years. But Florida's growers have figured out a way to keep growing edible oranges, even on infected trees. They've implemented a slew of hor