Featured Research

from universities, journals, and other organizations

Secret of cattle ticks' resistance to pesticide

Date:
October 7, 2013
Source:
University of Glasgow
Summary:
Scientists have discovered how a tick that transmits devastating diseases to cattle has developed resistance to one of the main pesticides used to kill it.

The Rhipicephalis microplus - cattle tick.
Credit: Prof Nicholas Jonsson.

Scientists have discovered how a tick which transmits devastating diseases to cattle has developed resistance to one of the main pesticides used to kill it.

Related Articles


Approximately 80% of cattle around the world, mostly in the tropics and sub-tropics, are exposed to the cattle tick -- Rhipicephalis microplus -- which can cause anemia, reduced rate of growth and death, resulting in a major economic impact on farmers.

Prevention of disease is through frequent treatment of cattle with acarides -pesticides for ticks and mites -- mainly amitraz, ivermectins and pyrethroids, but ticks have become increasingly resistant to these treatments.

The global cost of the tick-borne diseases and associated acaricide application is estimated to be more than £4 billion annually.

Now scientists at the University of Glasgow have identified the genetic basis for at least one form of resistance to amitraz which will allow a genetic test for resistance to be developed.

Professor Nicholas Jonsson, of the Institute of Biodiversity, Animal Health and Comparative Medicine, said: "Resistance to all the main acaricides is well documented -- for example amitraz resistance is seen in about 20% of Australian tick populations and more than 50% of Mexican ticks.

"When resistance is found, farmers generally increase the frequency of acaricide treatment, resulting in increased cost and sometimes undesirable effects on the environment.

"The most common response to the diagnosis of acaricide resistance on a farm is to change acaricide classes, but one of the problems faced by farmers is getting a reliable diagnostic test for resistance.

"Although a genetic test for resistance is not likely to be perfect, the existing bioassays are technically challenging, expensive and require six weeks to complete."

This research paves the way for a new genetic test for resistance that will help farmers to make management decisions for the control of ticks as well as enable empirical studies on field and laboratory populations of ticks to test the effectiveness of resistance management strategies.

The study was conducted on cattle at the University of Queensland's Pinjarra Hills Campus, in Australia where the impact of ticks and treatments to control them costs £120 million per annum.

Prof Jonsson added: "There are many theories as to how acaricide resistance can be delayed or accelerated in practice.

"It has been suggested that rotating between acaricide classes, using mixtures of acaricides, preserving refugia of untreated populations, and using tick-resistant cattle might all delay the development of resistance.

"However, without empirical studies to test the value of the management strategies, it is really impossible to provide evidence-based recommendations to farmers."

The research, published in the journal Proceedings of the National Academy of Sciences (PNAS), is the culmination of 10 years' of research.


Story Source:

The above story is based on materials provided by University of Glasgow. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. W. Corley, N. N. Jonsson, E. K. Piper, C. Cutulle, M. J. Stear, J. M. Seddon. Mutation in the Rm AOR gene is associated with amitraz resistance in the cattle tick Rhipicephalus microplus. Proceedings of the National Academy of Sciences, 2013; DOI: 10.1073/pnas.1309072110

Cite This Page:

University of Glasgow. "Secret of cattle ticks' resistance to pesticide." ScienceDaily. ScienceDaily, 7 October 2013. <www.sciencedaily.com/releases/2013/10/131007122556.htm>.
University of Glasgow. (2013, October 7). Secret of cattle ticks' resistance to pesticide. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2013/10/131007122556.htm
University of Glasgow. "Secret of cattle ticks' resistance to pesticide." ScienceDaily. www.sciencedaily.com/releases/2013/10/131007122556.htm (accessed October 24, 2014).

Share This



More Plants & Animals News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Deep Sea 'mushroom' Could Be Early Branch on Tree of Life

Reuters - Innovations Video Online (Oct. 24, 2014) — Miniature deep sea animals discovered off the Australian coast almost three decades ago are puzzling scientists, who say the organisms have proved impossible to categorise. Academics at the Natural History of Denmark have appealed to the world scientific community for help, saying that further information on Dendrogramma enigmatica and Dendrogramma discoides could answer key evolutionary questions. Jim Drury has more. Video provided by Reuters
Powered by NewsLook.com
Black Bear Cub Goes Sunday Shopping

Black Bear Cub Goes Sunday Shopping

Reuters - Light News Video Online (Oct. 23, 2014) — Price check on honey? Bear cub startles Oregon drugstore shoppers. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Dances With Wolves in China's Wild West

Dances With Wolves in China's Wild West

AFP (Oct. 23, 2014) — One man is on a mission to boost the population of wolves in China's violence-wracked far west. The animal - symbol of the Uighur minority there - is under threat with a massive human resettlement program in the region. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
Breakfast Debate: To Eat Or Not To Eat?

Breakfast Debate: To Eat Or Not To Eat?

Newsy (Oct. 23, 2014) — Conflicting studies published in the same week re-ignited the debate over whether we should be eating breakfast. Video provided by Newsy
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:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

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