Featured Research

from universities, journals, and other organizations

New Test On Tap For Detecting Pesticide-Resistant Mites

Date:
April 29, 2005
Source:
USDA/Agricultural Research Service
Summary:
Commercial apiarists and state bee inspectors now have a fast new way to check Varroa mites for this honeybee parasite's resistance to the pesticides coumaphos and fluvalinate.

Varroa mites are a major threat to honey bee health and are becoming resistant to two compounds (coumaphos and fluvalinate) used to control them. Beekeepers now have a simple assay to determine whether mites are resistant and thus ensure use of appropriate control measures.
Credit: Photo by Stephen Ausmus

Commercial apiarists and state bee inspectors now have a fast new way to check Varroa mites for this honeybee parasite's resistance to the pesticides coumaphos and fluvalinate.

Agricultural Research Service (ARS) entomologists in Beltsville, Md., have developed a "do-it-yourself" bioassay that determines, within six hours, whether Varroa mites are fully resistant to the pesticides, are approaching resistance, or are still vulnerable.

Varroa mites are blood-sucking parasites of honeybees that can weaken or destroy hives. Continuous use of coumaphos and fluvalinate to prevent such damage has prompted the emergence of resistance among some Varroa populations, according to Jeffery Pettis, in the ARS Bee Research Laboratory at Beltsville.

In studies there, Pettis and other ARS entomologists sought to devise a faster, cheaper and more user-friendly alternative to current methods of checking for pesticide-resistant Varroa mites. These methods are labor-intensive affairs that require specialized equipment and the shipping of mite-infested bees.

The ARS scientists' bioassay is intentionally low-tech. Its main parts include glass canning jars in which to contain honeybees, mesh lids through which mites on the bees can fall out and be counted, and index cards that hold strips of either coumaphous or fluvalinate.

A mathematical formula determines the mites' resistance levels or susceptibility to the pesticides. For example, if the chemicals kill 25 percent of the mites, then the parasites can be considered fully resistant. However, if more than 50 percent are killed, then the mites are still vulnerable to the pesticides. This means the pesticide treatments should still be effective against the mites.

According to Pettis, some state bee inspectors have already used the bioassay to document mite resistance in applying for emergency-use exemptions on alternative control products. They're also using it to monitor the spread of pesticide-resistant mite populations.


Story Source:

The above story is based on materials provided by USDA/Agricultural Research Service. Note: Materials may be edited for content and length.


Cite This Page:

USDA/Agricultural Research Service. "New Test On Tap For Detecting Pesticide-Resistant Mites." ScienceDaily. ScienceDaily, 29 April 2005. <www.sciencedaily.com/releases/2005/04/050421233433.htm>.
USDA/Agricultural Research Service. (2005, April 29). New Test On Tap For Detecting Pesticide-Resistant Mites. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2005/04/050421233433.htm
USDA/Agricultural Research Service. "New Test On Tap For Detecting Pesticide-Resistant Mites." ScienceDaily. www.sciencedaily.com/releases/2005/04/050421233433.htm (accessed July 24, 2014).

Share This




More Plants & Animals News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Stone Fruit Listeria Scare Causes Sweeping Recall

Stone Fruit Listeria Scare Causes Sweeping Recall

Newsy (July 22, 2014) The Wawona Packing Company has issued a voluntary recall on the stone fruit it distributes due to a possible Listeria outbreak. Video provided by Newsy
Powered by NewsLook.com
Michigan Plant's Goal: Flower and Die

Michigan Plant's Goal: Flower and Die

AP (July 22, 2014) An 80-year-old agave plant, which is blooming for the first and only time at a University of Michigan conservatory, will die when it's done (July 22) Video provided by AP
Powered by NewsLook.com
Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Newsy (July 22, 2014) The 83 new genetic markers could open dozens of new avenues for schizophrenia treatment research. Video provided by Newsy
Powered by NewsLook.com
CDC Head Concerned About a Post-Antibiotic Era

CDC Head Concerned About a Post-Antibiotic Era

AP (July 22, 2014) Sounding alarms about the growing threat of antibiotic resistance, CDC Director Tom Frieden warned Tuesday if the global community does not confront the problem soon, the world will be living in a devastating post-antibiotic era. (July 22) 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