Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Popular fungicides failing, may cause hard choices for apple growers

13.07.2011
Orchard growers have started finding that some of the most commonly used fungicides are no longer effective at controlling apple scab, according to a Purdue University study.

Janna Beckerman, an associate professor of botany and plant pathology, said that extensive, long-term use of four popular fungicides has led to resistances in apples in Indiana and Michigan, the focus of her study.

"The fungicides that are regularly used to control scab have started to fail," said Beckerman, whose findings were published in the early online version of the journal Plant Disease. "But the most disturbing thing we found is that many of the samples we tested were resistant to all four fungicides. It's kind of like multidrug resistance in antibiotics. This is full-blown resistance."

Apple scab, caused by the fungus Venturia inaequalis, is highly destructive to apples, causing brown lesions on leaves and fruit. A single lesion can reduce an apple's value by 85 percent. Over time, the scabby lesion will crack and allow insects, other fungi and bacteria inside, causing a loss of the crop.

"It can cause orchard failures," Beckerman said. "An orchard grower that has this could lose blocks of an orchard, or depending on the amount of diversity in the orchard, they could lose the entire crop."

It's thought that when organisms adapt to form resistance, that change will weaken the organism in some other way. Beckerman said the study, done with Purdue graduate student Kim Chapman and Michigan State University professor George Sundin, showed apple scab, on the contrary, is becoming resistant to fungicides with no apparent fitness penalty to itself.

"Having these multiple resistances to fungicides doesn't debilitate them in any way," Beckerman said.

Apple scab samples were treated with dodine, kresoxim-methyl, myclobutanil or thiophanate-methyl. About 12 percent of the apple scab samples tested was resistant to all four fungicides.

The only options apple growers have, Beckerman said, is to use older fungicides that are tightly regulated, require more frequent application and are more expensive.

"It's going to change how growers manage their orchards," Beckerman said. "The more susceptible apple cultivars, like McIntosh, will become more chemically intensive to manage. Growers have few options as it is, and this will limit their options even further."

Beckerman said she and her collaborators would work to develop faster tests to detect fungicide resistance in apple scab to help growers change management plans in a timely manner. The U.S. Department of Agriculture, Purdue University and the Michigan Agricultural Experiment Station funded the research.

A publication-quality photo is available at http://www.purdue.edu/uns/images/2011/beckerman-applescab.jpg

Abstract on the research in this release is available at: http://www.purdue.edu/newsroom/research/2011/110712BeckermanScab.html

Brian Wallheimer | EurekAlert!
Further information:
http://www.purdue.edu

More articles from Life Sciences:

nachricht Researchers target protein that protects bacteria's DNA 'recipes'
21.08.2018 | University of Rochester

nachricht Protein interaction helps Yersinia cause disease
21.08.2018 | Schwedischer Forschungsrat - The Swedish Research Council

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: It’s All in the Mix: Jülich Researchers are Developing Fast-Charging Solid-State Batteries

There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.

The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...

Im Focus: Color effects from transparent 3D-printed nanostructures

New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference

Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...

Im Focus: Unraveling the nature of 'whistlers' from space in the lab

A new study sheds light on how ultralow frequency radio waves and plasmas interact

Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...

Im Focus: New interactive machine learning tool makes car designs more aerodynamic

Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.

When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...

Im Focus: Robots as 'pump attendants': TU Graz develops robot-controlled rapid charging system for e-vehicles

Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.

Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

LaserForum 2018 deals with 3D production of components

17.08.2018 | Event News

Within reach of the Universe

08.08.2018 | Event News

A journey through the history of microscopy – new exhibition opens at the MDC

27.07.2018 | Event News

 
Latest News

Air pollution leads to cardiovascular diseases

21.08.2018 | Ecology, The Environment and Conservation

Researchers target protein that protects bacteria's DNA 'recipes'

21.08.2018 | Life Sciences

A paper battery powered by bacteria

21.08.2018 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>