U.S. authorities are expanding the quarantine area for citrus greening (a.k.a. HLB) in California, Texas, and Louisiana. 

The Animal and Plant Health Inspection Service (APHIS) says the move follows HLB detections in "multiple locations" in these states.

APHIS is adding portions of Los Angeles, Orange, Riverside, and San Bernardino Counties in California. In Texas, it's adding all of Kleberg, Kenedy, and Webb Counties, and in Louisiana, all of Plaquemines and Saint Bernard Parishes.

"APHIS is applying safeguarding measures on the interstate movement of regulated articles from the regulated areas in California, Texas, and Louisiana," it said.

These measures parallel the intrastate quarantine authorities from the three states implemented over the last year.

"This action is necessary to prevent the spread of citrus greening to non-infested areas of the United States," APHIS said.

Further information from APHIS is available here.

California first detected the Asian citrus psyllid, which vectors the disease, in 2008, and HLB in 2012. Most recently authorities confirmed its presence on a residential Riverside property.

Meanwhile, Texas authorities said the disease had also entered the state in 2012. In 2008 it was found at limited sites in Louisiana. 

Since then HLB, which has wreaked havoc in the Florida citrus industry, has spread throughout all three states.