Featured Research

from universities, journals, and other organizations

Filth Flies Feel The Heat

Date:
January 4, 2006
Source:
USDA/Agricultural Research Service
Summary:
Commercial insectaries that produce wasps as biocontrol agents will benefit from new Agricultural Research Service (ARS) findings showing that killing fly pupae—the food source for the wasp larvae—with heat shock is an affordable alternative to irradiation. The heat shock alternative will help insectaries meet fluctuating demand for two parasitic wasps used to control filth flies.

Parasitic wasps, such as this Muscidifurax raptor (top) preparing to lay an egg on a fly puparium, are sold by commercial insectaries as biocontrol agents for filth flies. The wasp's progeny feed as larvae inside housefly puparia and later emerge as adults.
Credit: Image courtesy of USDA/Agricultural Research Service

Commercial insectaries that produce wasps as biocontrol agents will benefit from new Agricultural Research Service (ARS) findings showing that killing fly pupae—the food source for the wasp larvae—with heat shock is an affordable alternative to irradiation. The heat shock alternative will help insectaries meet fluctuating demand for two parasitic wasps used to control filth flies.

House flies and stable flies are nuisances on livestock and poultry farms, and they transport disease-causing organisms. Parasitic wasps released as biocontrols can reduce the need for insecticides on livestock and poultry farms.

Wasp species such as Muscidifurax raptor and Spalangia cameroni lay a single egg inside a fly puparium before it hatches, and the larva feeds on the fly pupa before emerging as an adult. But it takes one week to produce fly pupae for the parasitoids, and these live pupae only have a shelf life of two to three days. So insectaries turned to ARS for help.

Entomologist Christopher J. Geden of the ARS Center for Medical, Agricultural, and Veterinary Entomology in Gainesville, Fla., studied fly pupae killed with gamma irradiation, cold and heat shock for their ability to produce parasitoids.

Researchers have reared parasitoids with irradiated pupae for years, but it's not practical for commercial insectaries. Previous results from freeze-killing pupae have been mixed. Heat shock killing in an oven had never been tried before.

The number of wasp progeny, male or female, emerging from pupae killed by heat shock or gamma irradiation was not significantly different from those produced on live hosts.

Geden found heat-killed, irradiated and freeze-killed pupae stored in refrigerated plastic bags remain as effective for production of M. raptor as live pupae for as long as four months.

Production of S. cameroni on heat-killed and irradiated pupae was equal to parasitoid production on live pupae for up to two months of storage. After that, production declined to 63 percent of live pupae. Production of S. cameroni on freeze-killed pupae was about 75 percent of production using live pupae for eight weeks of storage but declined rapidly afterward.

ARS is the U.S. Department of Agriculture's chief scientific research agency.


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. "Filth Flies Feel The Heat." ScienceDaily. ScienceDaily, 4 January 2006. <www.sciencedaily.com/releases/2006/01/060103190833.htm>.
USDA/Agricultural Research Service. (2006, January 4). Filth Flies Feel The Heat. ScienceDaily. Retrieved September 15, 2014 from www.sciencedaily.com/releases/2006/01/060103190833.htm
USDA/Agricultural Research Service. "Filth Flies Feel The Heat." ScienceDaily. www.sciencedaily.com/releases/2006/01/060103190833.htm (accessed September 15, 2014).

Share This



More Plants & Animals News

Monday, September 15, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Conservationists Face Uphill PR Battle With New Shark Rules

Conservationists Face Uphill PR Battle With New Shark Rules

Newsy (Sep. 14, 2014) — New conservation measures for shark fishing face an uphill PR battle in the fight to slow shark extinction. Video provided by Newsy
Powered by NewsLook.com
Shocker: Journalists Are Utterly Addicted To Coffee

Shocker: Journalists Are Utterly Addicted To Coffee

Newsy (Sep. 13, 2014) — A U.K. survey found that journalists consumed the most amount of coffee, but that's only the tip of the coffee-related statistics iceberg. Video provided by Newsy
Powered by NewsLook.com
'Magic Mushrooms' Could Help Smokers Quit

'Magic Mushrooms' Could Help Smokers Quit

Newsy (Sep. 11, 2014) — In a small study, researchers found that the majority of long-time smokers quit after taking psilocybin pills and undergoing therapy sessions. Video provided by Newsy
Powered by NewsLook.com
Spinosaurus Could Be First Semi-Aquatic Dinosaur

Spinosaurus Could Be First Semi-Aquatic Dinosaur

Newsy (Sep. 11, 2014) — New research has shown that the Spinosaurus, the largest carnivorous dinosaur, might have been just as well suited for life in the water as on land. 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