California ponders citrus quarantine after latest pest find

11/29/2012 01:06:00 PM
Vicky Boyd

citrus psyllidThe discovery of an Asian citrus psyllid in the heart of California’s citrus producing area has the industry on edge awaiting a quarantine announcement.

“(The state) is being prudent in evaluating the best way to handle this,” said Bob Blakely, director of industry relations for California Citrus Mutual, Exeter.

As of Nov. 29, harvest continued unrestricted, said Gavin Iacono, Tulare County deputy agricultural commissioner, standards and quarantine.

“Right now, it’s the status quo until they actually decide what it is they’re going to do and how big the quarantine area is.”

Mandarins are currently being picked, and the Tulare County navel harvest is about 25% complete, Blakely said.

The California Department of Agriculture was reviewing the situation and was expected to announce quarantine boundaries and fruit movement requirements as early as the first week of December, said Steve Lyle, public affairs director.

The quarantine talk was triggered after the trapping of a citrus psyllid near a Strathmore citrus grove in October, marking the second psyllid find in a year. A trap 4 miles away caught one in February.

Meanwhile, a trap about 10 miles away, near a Terra Bella citrus grove, secured a psyllid in November.

Not only do psyllids feed on citrus trees, sucking the sap and weakening them, but they can carry citrus greening, a bacterial disease also called huanglongbing or HLB.

Although harmless to humans and animals, the citrus greening bacteria can stunt and even kill citrus trees.

The disease has caused more than $1.3 billion in losses to the Florida citrus industry, according to a University of Florida study.

It also has been found in Texas, Louisiana, Georgia and South Carolina.

Citrus greening was found in March in a residential tree in the Hacienda Heights area of Los Angeles County.

How much of an impact the quarantine will have on grower-packers and the ongoing citrus harvest in Tulare County will depend on the boundaries, Blakely said.

“It keeps changing,” Iacono said about possible boundaries. “Originally, it was the whole county, then a 20-mile radius. Now they’re talking about a couple of different scenarios.”

Tulare County Ag Commissioner Marilyn Kinoshita and her staff met with about 700 growers, packers, haulers and processors, Nov. 28, to discuss what they knew about the quarantine.

Under the proposal, growers within the quarantine zone could move fruit to packinghouses within the regulated area without additional restrictions, Iacono said.


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Carl J. Fabry    
Florida  |  December, 04, 2012 at 10:49 AM

It is believed that there is no “cure” for Citrus Greening Disease (CGD), which is true; however, NO citrus disease has ever been "cured", or entirely gotten rid of, but only "controlled", and CGD is no exception. Some Florida growers, and University of Florida researchers, are successfully controlling CGD, with specific bactericides and nutrition, resulting in regenerated trees and increased production, with detectible levels of CGD remaining. CGD blocks the phloem, but this innovative program results in the phloem being opened back up and normal production resumed. After 5 years of positive results in Florida, There is HOPE!

Carl J. Fabry    
Florida  |  December, 04, 2012 at 11:41 AM

Regarding my previous comment, I neglected to mention that first and foremost, Psylid control is paramount and essential. The University of Florida, at Immokalee, has developed a very effective program of "area wide spraying", where growers in various districts coordinate Psylid control, with simoultaneous sprays, for very effective control. It is believed that some very proactive districts are nearly Psylid free.

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