Featured Research

from universities, journals, and other organizations

Single Insecticide Application Can Kill Three Cockroach Generations

Date:
June 24, 2008
Source:
Purdue University
Summary:
One dose of an insecticide can kill three generations of cockroaches as they feed off of each other and transfer the poison, according to entomologists who tested the effectiveness of a specific gel bait.

Research by Grzegorz "Grzesiek" Buczkowski has shown a single dose of insecticide can kill three generations of pests. Buczkowski, an assistant professor of entomology, says cockroaches are difficult to control because they reproduce rapidly, are most active at night and live in inaccessible places.
Credit: Purdue Agricultural Communication photo/Tom Campbell

One dose of an insecticide can kill three generations of cockroaches as they feed off of each other and transfer the poison, according to Purdue University entomologists who tested the effectiveness of a specific gel bait.

It is the first time that scientists have shown that a pest control bait will remain effective when it's transferred twice after the first killing dose, said Grzegorz "Grzesiek" Buczkowski, assistant professor of entomology. Passing the insecticide from one cockroach to the next is called horizontal transfer.

"Our findings are exciting because cockroaches are difficult to control since they multiply so rapidly," Buczkowski said. "They are especially bad in urban housing, and they can cause health problems."

It's difficult to find and rid areas of the insects because cockroaches come out at night and live in inaccessible places, he said. They invade places where they easily can find plenty of food and water. In addition, cockroaches are attracted to where other cockroaches are by a chemical compound, called pheromones, that animals secrete and which influences other cockroaches' behavior.

In a laboratory study, the scientists used German cockroaches, the most common household species in the United States, to test a DuPont product with the active ingredient indoxacarb. Although the researchers only studied indoxacarb, Buczkowski said it's possible other insecticides also may have three-generation horizontal transfer kill capabilities.

In the first transfer of the insecticide from a dying adult to the youngest stage nymphs, an average of 76 percent of these cockroaches also succumbed to the indoxacarb-containing excretions from the dying cockroaches, the researchers report in the June issue of the Journal of Economic Entomology. In the third stage of transfer, or tertiary kill, an average of 81 percent of the adult male cockroaches that ate the dead nymphs' bodies also died. Both statistics were taken 72 hours after the insects were exposed to a cockroach already affected by indoxacarb.

Mortality of cockroaches at the fourth level, three times removed from the original insecticide dose, was not any higher than for those insects that hadn't been exposed to the insecticide through any method, said Buczkowski, director of the Purdue Industrial Affiliates Program.

Adult German cockroaches are a shiny orangey tan and about half an inch long. The youngest nymphs, as used in this study, are called first instars and are one to five days old. Nymphs go through five stages on their way to adulthood.

In addition to attracting more cockroaches with the pheromones in their feces, the insects can cause other problems.

"Cockroaches molt their skin as they go from one nymph stage to the next, and there is a huge accumulation of the skin left in the areas where they live," Buczkowski said. "The dead skin becomes airborne and causes allergies and asthma. It's really the biggest problem with cockroaches."

Buczkowski plans to investigate tertiary kill with other cockroach baits and possibly look at horizontal transfer of insecticides in natural settings rather than just in the laboratory.

The other researchers involved in this study were Gary Bennett, Purdue entomology professor, and Clay Scherer, global product development manager for DuPont Professional Products.

The Purdue Industrial Affiliates Program and DuPont funded this project. The Purdue faculty members involved in the research have no financial interest in DuPont or its insecticide Advionฎ Cockroach Gel.


Story Source:

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


Cite This Page:

Purdue University. "Single Insecticide Application Can Kill Three Cockroach Generations." ScienceDaily. ScienceDaily, 24 June 2008. <www.sciencedaily.com/releases/2008/06/080623175405.htm>.
Purdue University. (2008, June 24). Single Insecticide Application Can Kill Three Cockroach Generations. ScienceDaily. Retrieved July 27, 2014 from www.sciencedaily.com/releases/2008/06/080623175405.htm
Purdue University. "Single Insecticide Application Can Kill Three Cockroach Generations." ScienceDaily. www.sciencedaily.com/releases/2008/06/080623175405.htm (accessed July 27, 2014).

Share This




More Plants & Animals News

Sunday, July 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Sea Turtle Hatchlings Emerge from Nest

Raw: Sea Turtle Hatchlings Emerge from Nest

AP (July 27, 2014) — A live-streaming webcam catches loggerhead sea turtle hatchlings emerging from a nest in the Florida Keys. (July 27) Video provided by AP
Powered by NewsLook.com
Trees Could Save More Than 850 Lives Each Year

Trees Could Save More Than 850 Lives Each Year

Newsy (July 27, 2014) — A national study conducted by the USDA Forest Service found that trees collectively save more than 850 lives on an annual basis. Video provided by Newsy
Powered by NewsLook.com
What's To Blame For Worst Ebola Outbreak In History?

What's To Blame For Worst Ebola Outbreak In History?

Newsy (July 27, 2014) — A U.S. doctor has tested positive for the deadly Ebola virus, as the worst-ever outbreak continues to grow. Video provided by Newsy
Powered by NewsLook.com
The New York Times Backs Pot Legalization

The New York Times Backs Pot Legalization

Newsy (July 27, 2014) — The New York Times has officially endorsed the legalization of marijuana, but why now, and to what end? 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:
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