The web is buzzing about a new pyrethroid-resistance study of New York City bed bugs by researchers at the University of Massachusetts and Seoul National University. Pyrethroid-resistance is just one reason it is often so hard to get rid of bed bugs.

Two of the many articles picking up on the study’s results included this item in the U.S. News and World Report Health Blog today, and this article from Monday’s LiveScience.

As the U.S. News Health blogger reported,

Bed bugs in New York City, where infestations have grown in recent years, appear to have developed nerve cell mutations that weaken the effect of the pyrethroid toxins, such as deltamethrin, commonly used against them, according to a report in the current issue of the Journal of Medical Entomology. Such nervous system poisons normally would paralyze and kill the nocturnal blood suckers.

Toxicologists at the University of Massachusetts Amherst and Korea’s Seoul National University found that the New York City bed bugs are now as much as 264 times more resistant to deltamethrin than an easier-to-kill type of bed bug found in Florida.

Pyrethroid-resistance is no surprise to us, since it has been found elsewhere.

Unfortunately, the current round of press coverage of the U Mass-Amherst / Seoul National U study may give those not in the know about pyrethroid-resistance the sense that this is a “New York City” problem, which it isn’t.

This 2007 article in PCT Online from Alvero Romero, Michael Potter and Kenneth F. Haynes outlines a study comparing pyrethroid-resistance found in populations from around the US:

Further testing of third-to-fifth instar nymphs from 16 different field populations indicated that pyrethroid resistance in bed bugs, while not universal, may be widespread (see accompanying map and table on pages 44 and 48). Using a “discriminating” dose equivalent to 10 times the labeled rate of deltamethrin (0.6 percent), 14 of 16 populations collected in Kentucky, Ohio, Michigan, New York, Massachusetts, Virginia, Florida and California were resistant (0 percent mortality), one field population from New Jersey was deemed “intermediate” (45 percent mortality), and one of the two populations collected from the same building in California was relatively susceptible (100 percent mortality).

(Information on getting a copy of this study follows at the bottom of the post.)

The Livescience article helps put the new pyrethroid-resistance data in perspective, with the help of Dr. Lou Sorkin, a friend to Bedbuggers everywhere:

Unless the researchers sampled every population of bed bugs in New York, it is unlikely that all NYC bed bugs are resistant to the insecticide, said Louis Sorkin, an entomologist at the American Museum of Natural History in New York.

Also, most pest control companies rely on more than one insecticide to combat bed bugs, he said. The ideal is to use a combination of chemicals that have different modes of action — perhaps one is good at killing the adults and nymphal stages immediately while another is better at lingering and killing bugs days later — and come from different chemical families, not just pyrethroids, Sorkin said.

Exterminators also have different ways to administer insecticides, which can make a difference — foams, powders, aerosols. However, over-the-counter aerosol bombs are not recommended. They just cause the bugs to scatter, Sorkin said, and fail to get inside cracks where bugs can hide.

“Some people don’t like to say they have bed bugs. They try to take care of it themselves,” Sorkin said. But amateur attempts often just push the bugs away for a while and spread them into neighboring properties.

Lou reminds us not to take an infestation lightly. If you’re using traditional treatments for bed bugs, a multi-pronged approach is best. The article notes that Integrated Pest Management (IPM) solutions go beyond sprays and dusts:

Techniques include caulking, spackling and using other sealants to fill cracks and crevices, refinishing and sealing floors, injecting frozen carbon dioxide “snow” into electronics to freeze pests, re-painting walls and other surfaces, using low-moisture steam and clothes dryer heat to kill bugs, and injecting bug-killing dust into electrical outlets and switches.

Commodity fumigation (usually done by sulfuryl fluoride gas, including Vikane TM) is also mentioned by Lou in the article. (The home itself obviously must be treated thoroughly if items are to be gassed and returned to it.)

Thermal heat is not specifically mentioned, but is now an option which can be effective.

If done properly, no bed bug is resistant to sulfuryl fluoride (Vikane TM) or thermal heat. However, these options can be more expensive, and are not available everywhere.

Pyrethroid-resistance is a good reason for the pest control industry to keep seeking alternative solutions to bed bugs and for all pest professionals, landlords, tenants, and property owners to get serious about an aggrerssive, multi-pronged approach to fighting bed bugs.

The new research study referred to in these articles is:

Yoon, K. S., Kown, D. H., Strycharz, J. P., Hollingsworth, C. S., Lee, S. H., and Clark, J. M. 2008. Biochemical and Molecular Analysis of Deltamethrin Resistance in the Common Bed Bug (Hemiptera: Cimicidae). J. Med. Entomol. 45(6): 1092-1101.

(Use accession number 185379 to get a PDF of this item from the Armed Forces Pest Management Board Literature Retrieval System! Accession numbers for items below are also noted where available.)

Also see the study referenced in the PCT Online article above:

Romero, A., M.F. Potter, D.A. Potter and K.F. Haynes. 2007. Insecticide resistance in the bed bug: a factor in the pest’s sudden resurgence? J. Med. Entomol. 44 (2):175-178. Accession number 183531.

The PCT Online article linked to above also suggests the following articles:

Myamba, J, C.A. Maxwell, A. Asidi and C.F. Curtis. 2002. Pyrethroid resistance in tropical bed bugs, Cimex hemipterus, associated with use of treated bednets. Med. and Vet. Entomol. 16, 448-451. Accession number 175921.

Boase, C.J., G. Small, and R. Naylor. 2006. Interim report on insecticide susceptibility status of UK bedbugs. Professional Pest Controller. Summer 2006:6-7.

Karunaratne, S.H.P.P., B.T. Damayanthi, M.H.J. Fareena, V. Imbuldeniya, and J. Hemingway. 2007. Insecticide resistance in the tropical bed bug Cimex hemipterus. Pestic. Bochem. Physiol. 88, 102-107. Abstract.

Similar Posts:

• Bed bugs on Today with Meredith Viera and Janice Lieberman, today
• Scholastic Headquarters treated for bed bugs; update on Penguin
• Bed bugs or rats: Gothamist asks which you’d rather have
• Bed bugs at Northern Kentucky University
• Bed Bugs hit Johnson City Fire Station

Bed bug podcasts, bed bug news:

• Pest Management Professional – Continued technological and educational advancement in pest detection, identification, treatment and control methods. | Web Exclusive | 10 Questions with Jerome GoddardTen Questions with Jerome Goddard (Pest Management Professional Podcast)–includes interesting discussion of whether bed bugs are potential transmitters of disease, or not. From 9/06, but new to me and maybe you too.

  (tags: interview audio bedbugs Dr.JeromeGoddard entomologist sept2006)

• PCTOnline.com :: Article :: [Focus On Public Health] Do Bed Bugs Carry Disease?Article from PCTOnline by Jerome Goddard (11/2003) on whether bed bugs spread disease.

  (tags: bedbugs disease health diseasevector Dr.JeromeGoddard PCTOnline)

• Pest Management Professional podcast | 10 Questions with Alvaro RomeroInterview with Univ. of Kentucky bed bug researcher / graduate student Alvaro Romero. From April 2007.

  (tags: podcast alvaroromero researcher)

• Pest Management Professional Podcast | 10 Questions with Rick CooperInterview with Rick Cooper of Cooper Pest, NJ–focusing on pesticide resistance. September 2007.

  (tags: rickcooper interview podcast sept2007)

• San Jose Mercury News – Bedbugs, electrical problems force evacuation of Ventura motel“A bedbug-infested low-rent Ventura motel was shut down by authorities, forcing poor families and disabled tenants to spend the Christmas season hunting for cheap lodging.” The 37-room Travelers Beach Inn hopes to reopen in a week.

  (tags: bedbugs hotelclosure ventura california travelersbeachinn motel code dec2007 2007 budgetmotel)

• Review of Judith McNeil’s The Girl with the Cardboard Port :: Sarah Chew, thestar.com.my“She recalled with humour the shock of discovering squat toilets, bed bugs, and corpse-eating rats…” From a review of an Australian woman’s memoir of life in 1950s/early 1960s Singapore.

  (tags: singapore bedbugs 1950s 1960s judithmcneil memoir dec2007 2007 bookreview)

• Rats: Hawaii’s first invasive species – The Molokai Times“In cities, rats are one of Hawaii’s biggest pest problems after ants and bed bugs, said Tim Lyons, director of the Hawaii Pest Control Association.” Bed bugs are #2? Not for long, I suspect.

  (tags: bedbugs hawai’i hawaii pests dec2007 2007 spread)

Similar Posts:

None Found