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Patch Blog: Help Save Our Citrus Trees

There's an incurable citrus disease in LA County. What does this mean for the average person?

When the Spaniards founded Mission San Gabriel, they brought oranges with them. It turned out that Southern Californian conditions help citrus reach peak flavor.

Though largely languishing under concrete, asphalt and lawns now, beneath our feet is one of the most perfect citrus growing areas in the world. A walk around town shows a number of homes in our city that boast beautiful citrus trees. Taste an orange grown here, and you'll likely taste an orange that puts even the choicest supermarket produce to shame.


Citrus trees are relatively easy care here but The California Dept. of Forest and Agriculture (CDFA) just announced that huanglongbing (HLB or Citrus Greening Disease) has been spotted and confirmed in Hacienda Heights.

It is carried by an exotic pest called the Asian citrus psyllid (ACP). While ACP had been spotted in LA County in the previous couple years, we had managed to escape HLB up to this point.

So what's the big deal about Citrus Greening Disease?

HLB destroys the appearance of the fruit as well as the taste. Eventually, it kills the tree. This is bad news for states like Florida, Texas and California that have large citrus growing industries.

California's citrus growing industry brings in nearly $2 billion annually. HLB has been in Florida since 2005 and the University of Florida estimates it has resulted in more than 6,600 lost jobs, $1.3 billion in lost revenue to growers and $3.6 billion in lost economic activity in the state. A threat like this would always be serious but on top of our current economic situation it would be disastrous.

Have you ever crossed the state border or gone through customs without declaring plants, fruits or vegetables, because you figured such things were harmless? Well, the harm that smuggling plant materials into our state can do is very real.

Citizens, particularly home growers, can make a crucial difference in quarantining this disease to as small an area of our state as possible in the hopes we can eradicate it. CDFA has announced a quarantine that will restrict the movement of citrus trees, citrus plant parts, green waste and all citrus fruit except what is commercially cleaned and packed.

Do not remove or share citrus fruit, trees, clippings/grafts or related plant material. You may still eat fruit from your own trees on site. This is tremendously inconvenient and a blow to home gardeners and produce sharing groups. However, it would be far more inconvenient in the long run were this disease to take hold in our state. Not only would there be many lost jobs and much lost revenue, you might have a hard time ever growing citrus without HLB ruining it.

And so our land will go from being one of the most perfect citrus-growing areas in the world to a citrus wasteland. Don't let it happen! Observe the quarantine. Check your own plants and report any sign of Asian citrus psyllid or HLB to the CA Dept of Forestry and Agriculture.

For more information and to see what ACP and HLB look like, click HERE. 

And see the attached video for tips. 

Megan Lynch April 4, 2012 at 08:17 pm
CDFA has released a map of the quarantine area as it stands now. Though inconvenient, I highly recommend you observe the quarantine even if you are not technically within that area. Because insects are so small and most homeowners can't spot a particular exotic pest, it's quite possible that HLB may already be in other parts of Southern California and just hasn't been confirmed yet. Better an overabundance of caution in the beginning, giving us the best chance of eradicating this pest and disease, than being too loose about the quarantine and losing all chance of stopping this serious agricultural pest. I wouldn't want to lose the chance of seeing tree-ripened homegrown citrus showing up at produce swaps anymore. http://www.pasadenastarnews.com/news/ci_20326694/state-officials-release-map-quarantine-deadly-citrus-disease
Kristen Lepore (Editor) April 4, 2012 at 09:51 pm
Thanks for the update, Megan. I uploaded the map for everyone to see. Click on the PDF above.
Barbara Eisenstein, Contributor April 5, 2012 at 02:04 am
Great info, Megan. I have been reading about this, too and really do hope that people take it seriously.
Megan Lynch April 6, 2012 at 05:04 pm
Thanks, Barbara. I just uploaded a UC ANR PDF file "Asian Citrus Psyllid: Pest Notes for Home and Landscape".
Megan Lynch April 6, 2012 at 07:23 pm
Sorry for the serial posting. It's just a really important issue and I keep wanting to add things as I find them out. If you're a member of an ethnic community with many members who do not speak English, try to get the word out. I haven't seen any official materials yet in Asian Languages, but there's a website in Spanish http://peligrancitricosencalifornia.org/ And a video in Spanish here: http://www.youtube.com/watch?v=2Okk0NOhksY If you call CA Dept of Forestry & Agriculture, it's possible they've developed materials in other languages. If not, it's that much more important for bilingual community members to get the word out.
Nicole Charky April 6, 2012 at 11:53 pm
Hey Megan, thanks for sharing. We do have Korean and Armenian speakers in La Crescenta and Montrose. I'll check up on if they have this material available for those languages.
Michelle April 7, 2012 at 03:14 am
Thanks Megan, I'll pass it on to the members in my produce exchange group.
Michael Seales April 7, 2012 at 06:34 pm
I imagine it's fine, but is it still ok to put citrus clippings in green waste bins? Or should they go in the trash?
Megan Lynch April 7, 2012 at 06:51 pm
From the CDFA press release: "quarantine of the infested area to limit the spread of the disease by restricting the movement of citrus trees, citrus plant parts, green waste, and all citrus fruit except what is commercially cleaned and packed." So if you're in the quarantine zone, definitely DON'T put citrus clippings in the green waste. Putting them in the trash still potentially distributes HLB/ACP. Call CDFA to find out the approved way of disposing of them. CDFA's pest hotline is 1-800-491-1899 7am - 4:30pm M-F. I recommend calling them for the definitive answers on these issues.
If you're not in the quarantine area, I would still advise mostly acting as if you were. Green waste gets made into compost that cities give away free to gardeners. That free compost often gets used in school gardens, community gardens and public landscaping. So it could potentially spread the pest/disease very quickly. Even with plant diseases we don't have quarantines for (like fireblight, late blight, brown rot), don't put diseased plant waste in the green waste recycling. Hot composting can kill weed seeds and may kill some sorts of bacteria & fungus but the pile is only uniformly hot if it's being well-tended. It's just best to be on the safe side and not send diseased materials to something you know is going to be composted and re-distributed to other gardeners.
Megan Lynch April 14, 2012 at 11:34 pm
Here's another good blog post also recommending strict adherence to guidelines whether you're in the quarantine zone or not:
http://athinkingstomach.blogspot.com/2012/04/california-without-citrus.html
Kristen Lepore (Editor) April 16, 2012 at 03:04 pm
More info from Highland Park-Mt. Washington Patch: http://patch.com/A-s2ff
Kristen Lepore (Editor) April 18, 2012 at 06:30 pm
Citrus Disease Found In Altadena Trees: http://patch.com/A-s6ry
Kristen Lepore (Editor) April 18, 2012 at 06:59 pm
Correction: The diseased tree was not found in Altadena but rather Hacienda Heights. http://patch.com/A-s6ry
Megan Lynch April 26, 2012 at 04:43 am
An expert on HLB (Citrus Greening) spoke to the San Diego chapter of CA Rare Fruit Growers. People have been asking me for more detailed information about this disease. This presentation helps lay out how serious this is. It's not concise, but it's definitely of interest to home growers of citrus.
http://www.youtube.com/watch?v=MwpsJqUA3vk "A huanglongbing, HLB, presentation given by Dr. Allan Dodds to the North County San Diego CRFG chapter on April 20, 2012. Very relevant since HLB was recently found in the state for the first time in Hacienda Heights, CA. "

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