Research and Extension Center System
University of California
Research and Extension Center System

Posts Tagged: citrus

New discovery shows promise for battling the Asian Citrus Psyllid.

Native to Asia, the Asian citrus psyllid, Diaphorina ciri, was first detected in the United States in June 1998 in Palm Beach County, Florida. Since then, ACP has invaded all other US citrus areas.  It has been detected in 26 of California's 58 counties. Infected psyllids can transmit the bacterium Candidatus Liberibacter asiaticus, which causes the fatal citrus disease Huanglongbing (HLB). HLB is currently the most devastating threat to the worldwide citrus industry. A citrus tree infected with HLB may not exhibit any symptoms for two years, and will usually die within five years. UC ANR IPM states that there is no known cure. “The only way to protect trees is to prevent spread of the HLB pathogen in the first place, by controlling psyllid populations and removing and destroying any infected trees.”

The California Department of Food and Agriculture (CDFA) has set up extensive monitoring and quarantine programs to track and try to slow the spread of the insect and disease. Currently, both residential and commercial sites that have citrus are monitored by checking yellow sticky traps. Psyllid and leaf samples are being tested for the presence of HLB.

If ACP is detected in an area, farmers must resort to regular spray programs to try to control the ACP population. This practice negatively impacts efforts to have a citrus crop grown with IPM strategies that rely on beneficial insects. In a ground-breaking discovery encompassing six years of research, an international team of scientists led by UC Davis chemical ecologist Walter Leal announced they've identified the sex pheromone of ACP. This pheromone can be used to attract more ACP to sticky traps. “Having a [pheromone] lure to dramatically improve captures of this psyllid with the conventional sticky traps is a major progress toward [developing] integrated pest management [strategies],” said Professor Jose Robert Parra of the University of Sao Paulo. Read more.

This is an Asian citrus psyllid, which is about the size of an aphid.

Posted on Tuesday, January 2, 2018 at 11:16 AM
Tags: ACP (2), citrus (6), HLB (2), IPM (1)

Pourreza wins international prize for HLB detection.

Alireza Pourreza, a newly appointed UC Cooperative Extension agricultural engineering advisor at Kearney Agricultural Research and Extension center, has been awarded the 2016 Giuseppe Pellizzi Prize by the Club of Bologna, an honor presented every other year to the best doctoral dissertations focused on agricultural machinery and mechanization. The Club of Bologna is a world taskforce on strategies for the development of agricultural mechanization.

Pourreza, who earned his Ph.D. at the University of Florida in 2014, worked on early detection of Huanglongbing (HLB) disease of citrus. HLB, an incurable disease that is spread by Asian citrus psyllid (ACP), has seriously impacted citrus production in Florida. The disease has been found in commercial and residential sites in all counties with commercial citrus. Read more.

Alireza Pourreza, UC Cooperative Extension assistant advisor in agricultural engineering.

Posted on Thursday, October 27, 2016 at 4:11 PM
Tags: ACP (2), citrus (6), engineering (1), HLB (2)

Citrus Education at the Library

Citrus Farmers Mkt Collage 1

The Lindcove Research and Extension Center partnered with the Tulare Public Library on March 28 to present a special Kids' Citrus Farmers Market at the Library. The event incorporated the Library's ag-themed motto, "Come Grow with TPL,"...

Posted on Tuesday, April 7, 2015 at 3:13 PM
  • Author: Roberta Barton
Tags: citrus (6), library (1), Lindcove (3)

Lindcove Research and Extension Center to welcome visitors to their variety block on March 20, 2015.

UC ANR Lindcove Research and Extension Center will provide an opportunity for the public to learn more about citrus varieties on March 20, 2015, from 1-3 PM.  Visitors will be able to tour the demonstration orchard that contains nearly 200 of the most common varieties of citrus.  Attendees can view tree growth characteristics, ask questions about varieties, and taste the fruit.


Ana Toste: 559-592-2408 ext 151


22963 Carson Ave., Exeter, CA 93221

Once you arrive at LREC, follow the signs to the parking area.

Posted on Wednesday, March 18, 2015 at 3:33 PM
  • Author: Ana Toste
Tags: citrus (6)

Citrus Show and Tell

Roberta Barton delivers an agriculture lesson.

Second and third grade students at Snowden Elementary School in Farmersville learned all about citrus this month. Roberta Barton, ANR Community Educator, teamed up with Grilda Gomez, Tulare County CE Nutrition Educator, to visit 125 students in...

Posted on Wednesday, March 18, 2015 at 9:36 AM
  • Author: Roberta Barton
Tags: ag (1), agriculture (1), citron (1), citrus (6), exercise (1), Lindcove (3), mandarin (1), nutrition (1), pummelo (1), students (1)

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