Featured Research

from universities, journals, and other organizations

Protecting Apples From Disease

Date:
February 17, 2009
Source:
American Society for Horticultural Science
Summary:
Washington State's famous apple industry brought in $1.4 billion in 2006, but a disease is cutting into those profits. Lenticel breakdown disorder, known as LB, creates brown spots and indentations most commonly on the 'Gala' variety of apple, but these signs don't show up until after apples are harvested, stored, and processed. Time and materials are spent on fruit that can't be sold, and if a shipment goes out before symptoms are detected, the reputation of the grower is jeopardized.

Washington's famous apple industry brought in $1.4 billion in 2006, but a disease is cutting into those profits.

Lenticel breakdown disorder, known as LB, creates brown spots and indentations most commonly on the 'Gala' variety of apple, but these signs don't show up until after apples are harvested, stored, and processed. Time and materials are spent on fruit that can't be sold, and if a shipment goes out before symptoms are detected, the reputation of the grower is jeopardized.

Researchers at the U.S. Department of Agriculture, led by Eric A. Curry, are looking for ways to reduce the incidence and/or severity of LB in 'Gala' apples. The study, published in the October-December 2008 issue of HortTechnology, compared several coatings sprayed on apples in three commercial orchards with a history of LB.

The coatings were EpiShield™ made from waxy plant extracts, PrimaFreshฎ, a concentrate of vegetable oils, and Natural Shine™, a concentrate of natural carnauba wax.

In 2005-06, selected trees in Chelan, Washington, were sprayed one day before harvest. The same formulas were sprayed on a set of trees in Malaga, Washington, in 2006-07 either 1 week before harvest or once a week for 3 weeks before harvest. In 2007 in Linares, Chile, the same formulas were sprayed on trees either 1 week before harvest or once a week for the 4 weeks before the harvest.

Harvested apples were stored and evaluated for quality after 90 and 180 days. A subset of the apples underwent a simulated packing process in which apples were soap-washed, cool-water rinsed, waxed, polished, and warm-air dried. After 3 days of storage, these apples were assessed based on the number of LB pits.

During storage, Chelan apples showed severe symptoms of LB regardless of treatment, suggesting insufficient time before harvest for the coatings to work. Typically the symptoms get worse with storage, but the study found the presence of LB to be strongest at 90 days, with little difference between 90 and 180 days.

Malaga apples also showed the most LB at 90 days. However, three treatments before harvest did reduce LB between 41% and 65% compared to untreated apples. At harvest, the fruit quality seemed unaffected, but some ripening effects increased with storage time. Apples treated three times were the least firm of all of the groups.

Of the Linares apples receiving a single application, only the EpiShield apples had fewer LB symptoms. When all four treatments were applied, apples had less LB—between 48% and 61% compared to the untreated apples. "Generally, multiple applications were more effective than single treatments for reducing incidence of LB," the study reports.

The researchers point out that further study is needed to better understand the optimum time and number of applications in relation to climate in order to make the most of LB-reducing treatments.


Story Source:

The above story is based on materials provided by American Society for Horticultural Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Curry, Eric A., Torres, Carolina, Neubauer, Luis. Preharvest Lipophilic Coatings Reduce Lenticel Breakdown Disorder in 'Gala' Apples. HortTechnology, 2008; 18: 690-696 [link]

Cite This Page:

American Society for Horticultural Science. "Protecting Apples From Disease." ScienceDaily. ScienceDaily, 17 February 2009. <www.sciencedaily.com/releases/2009/02/090217141417.htm>.
American Society for Horticultural Science. (2009, February 17). Protecting Apples From Disease. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2009/02/090217141417.htm
American Society for Horticultural Science. "Protecting Apples From Disease." ScienceDaily. www.sciencedaily.com/releases/2009/02/090217141417.htm (accessed September 2, 2014).

Share This




More Plants & Animals News

Tuesday, September 2, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) — A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Washington Wildlife Center Goes Nuts Over Baby Squirrels

Washington Wildlife Center Goes Nuts Over Baby Squirrels

Reuters - US Online Video (Aug. 30, 2014) — An animal rescue in Washington state receives an influx of orphaned squirrels, keeping workers busy as they nurse them back to health. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Experimental Ebola Drug ZMapp Cures Lab Monkeys Of Disease

Newsy (Aug. 29, 2014) — In a new study, a promising experimental treatment for Ebola managed to cure a group of infected macaque monkeys. Video provided by Newsy
Powered by NewsLook.com
Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) — State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) 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