Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Protecting apples from disease

19.02.2009
Researchers look for answers to reducing incidence, severity of lenticel breakdown

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, PrimaFresh®, a concentrate of vegetable oils, and Natural Shine™, a concentrate of natural carnauba wax.

In 2005, 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 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.

Michael W. Neff | EurekAlert!
Further information:
http://www.ashs.org
http://horttech.ashspublications.org/cgi/content/abstract/18/4/690

More articles from Agricultural and Forestry Science:

nachricht Plasma-zapping process could yield trans fat-free soybean oil product
02.12.2016 | Purdue University

nachricht New findings about the deformed wing virus, a major factor in honey bee colony mortality
11.11.2016 | Veterinärmedizinische Universität Wien

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>