From isjd@ars-grin.gov Tue May 16 15:18:54 2000 Date: Tue, 16 May 2000 12:34:57 -0400 From: ARS News Service To: ARS News List Subject: New Diet Could Trim Pests STORY LEAD: New Diet Could Help Trim Crop Pest Populations ___________________________________________ ARS News Service Agricultural Research Service, USDA Jesús García, (301) 504-1627, jgarcia@ars-grin.gov May 16, 2000 ___________________________________________ Agricultural Research Service scientists have now applied for a patent on a new insect diet that will make plant bugs and other crop pests unwitting accomplices to their own destruction. The key to mass-rearing these ravenous insects in sufficient numbers is developing a replacement for the plants they feed on. Without these special diets, the rearing of these insects becomes cost prohibitive. The new diet, which consists of cooked chicken eggs, lima bean meal, wheat germ, soy flour, yeast, sugar, vitamins and preservatives, was developed by scientists at ARS' Biological Control and Mass Rearing Research Unit in Mississippi State, Miss. This diet enables researchers to propagate destructive plant bugs as hosts for the production of parasitoids that may eventually help reduce insect pest numbers in the wild. One of these pests, the western tarnished plant bug, Lygus hesperus, accounted for about $71 million worth of cotton crop losses in 1998. One parasitoid, a tiny wasp called Amaphes iole, deposits its own egg into Lygus bug eggs, where it develops into an adult while consuming the Lygus eggs' contents. Once the adult wasp emerges, it is ready to mate. Any female offspring is capable of parasitizing up to 60 Lygus eggs in its 2-4 days of life as an adult. Two other wasps, Peristenus spp. and Leiophron uniformis, deposit their eggs inside Lygus nymphs, where they commence to feed. When the parasitoids reach their prepupal stage, they chew their way out of their devastated hosts. The new diet-fed insects are also used for research on sterile release programs which had never before included Lygus bugs because they could not be reared in sufficient numbers. Sterilized plant bugs reared on the diet may mate and produce sterile eggs in the wild. Most important, the new diet has been found to be an inexpensive and effective way to mass rear insect pests and their natural enemies for biologically based pest management. This technology enhances the agricultural community's ability to mass-produce natural enemies of pests and decreases its dependence on chemicals. ARS is the chief research arm of the USDA. ___________________________________________ Scientific contact: Allen C. Cohen, ARS Biological Control and Mass Rearing Research Unit, Mississippi State, Miss.; phone (662) 320-7560, fax (662) 320-7571, acohen@bcmrru.msstate.edu. ___________________________________________ This item is one of the news releases and story leads that ARS Information distributes on weekdays to fax and e-mail subscribers. You can also get the latest ARS news on the World Wide Web at www.ars.usda.gov/is/pr/thelatest.htm. * Feedback and questions to ARS News Service via e-mail: isjd@ars-grin.gov. * ARS Information Staff, 5601 Sunnyside Ave., Room 1-2251, Beltsville MD 20705-5128, (301) 504-1617, fax 504-1648.