Featured Research

from universities, journals, and other organizations

Fighting back against citrus greening

Date:
January 25, 2013
Source:
USDA/Agricultural Research Service
Summary:
Agricultural researchers are helping citrus growers and juice processors address the threat posed by Huanglongbing, a disease that is costing the citrus industry millions of dollars each year.

Oranges from trees infected with Huanglongbing (citrus greening) can be used for orange juice as long as they are mixed with other oranges, according to new ARS research.
Credit: Scott Bauer

U.S. Department of Agriculture (USDA) scientists in Fort Pierce, Fla. are helping citrus growers and juice processors address the threat posed by Huanglongbing (HLB), a disease that is costing the citrus industry millions of dollars each year.

Citrus trees infected with HLB, also called citrus greening, usually die within five to 10 years. Fruit on infected trees often falls to the ground before harvest, and fruit that remains on trees may become misshapen and sometimes only partially ripen.

Supervisory horticulturalist Elizabeth Baldwin with USDA's Agricultural Research Service (ARS) in Fort Pierce is investigating the effects of HLB on the taste of orange juice produced from diseased trees. Her goal is to provide help while a permanent solution is found.

She and her colleagues at the agency's U.S. Horticultural Research Laboratory evaluated fruit with or without HLB symptoms -- produced over two growing seasons -- for a number of fruit and juice characteristics. They compared Midsweet, Hamlin, and Valencia oranges, the three principal varieties harvested for processing, and used gas and liquid chromatography to analyze juice compounds.

They found that orange juice from the fruit with HLB symptoms was often higher in limonin and nomilin, compounds that can give the juice a bitter taste, but that the compounds were generally below levels that could be detected by human taste panels. Their results were published in the Journal of Agricultural and Food Chemistry.

In another study, they investigated how HLB infection affects juice quality in the same three varieties of orange with respect to cultivar, maturity, and processing methods. The results showed tremendous variability, depending on the harvest date and variety of orange. In general, the researchers found more of a problem with off-flavored juice from diseased Hamlin orange trees than with diseased trees of the Valencia and Midsweet varieties.

But the researchers concluded that using some fruit that has HLB symptoms would not cause problems in commercial operations as long as fruit with and without symptoms, harvested from several varieties, locations, and seasons, was mixed together. Those results were published in the Journal of Food Science.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. The original article was written by Dennis O'Brien. Note: Materials may be edited for content and length.


Journal References:

  1. Elizabeth Baldwin, Anne Plotto, John Manthey, Greg McCollum, Jinhe Bai, Mike Irey, Randall Cameron, Gary Luzio. Effect of Liberibacter Infection (Huanglongbing Disease) of Citrus on Orange Fruit Physiology and Fruit/Fruit Juice Quality: Chemical and Physical Analyses. Journal of Agricultural and Food Chemistry, 2010; 58 (2): 1247 DOI: 10.1021/jf9031958
  2. Anne Plotto, Elizabeth Baldwin, Greg McCollum, John Manthey, Jan Narciso, Mike Irey. Effect of Liberibacter Infection (Huanglongbing or “Greening” Disease) of Citrus on Orange Juice Flavor Quality by Sensory Evaluation. Journal of Food Science, 2010; 75 (4): S220 DOI: 10.1111/j.1750-3841.2010.01580.x

Cite This Page:

USDA/Agricultural Research Service. "Fighting back against citrus greening." ScienceDaily. ScienceDaily, 25 January 2013. <www.sciencedaily.com/releases/2013/01/130125111333.htm>.
USDA/Agricultural Research Service. (2013, January 25). Fighting back against citrus greening. ScienceDaily. Retrieved September 20, 2014 from www.sciencedaily.com/releases/2013/01/130125111333.htm
USDA/Agricultural Research Service. "Fighting back against citrus greening." ScienceDaily. www.sciencedaily.com/releases/2013/01/130125111333.htm (accessed September 20, 2014).

Share This



More Plants & Animals News

Saturday, September 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
Powered by NewsLook.com
Raw: Elephant Undergoes Surgery in Tbilisi Zoo

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

AP (Sep. 18, 2014) Grand the elephant has successfully undergone surgery to remove a portion of infected tusk at Tbilisi Zoo in Georgia. British veterinary surgeons used an electric drill to extract the infected piece. (Sept. 18) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins