A tiny insect called the Asian psyllid is feasting on Florida's citrus trees and spreading bacteria that is leeching nutrients from the trees. The bacterial disease, called Huanglongbing, does not affect humans but does kill off citrus trees. The disease is commonly referred to as citrus greening, which is witnessed when unripe fruit turns bitter and falls from the tree. The disease is relatively new to Florida, first detected in 2005. The citrus greening disease has continued to spread each year since 2005 and in 2012 has been noticed deadlier than ever, devastating orange production to 10 percent losses from initial estimates. Experts are increasingly concerned, since the USDA has downgrading its crop estimates five months in a row now.