From isnv@ars-grin.gov Wed Oct 27 13:11:05 1999 Date: Wed, 27 Oct 1999 10:19:20 -0400 From: ARS News Service To: ARS News List Subject: Wee Wasps Vanquish Big Bad Beetles [ The following text is in the "iso-8859-1" character set. ] [ Your display is set for the "US-ASCII" character set. ] [ Some characters may be displayed incorrectly. ] STORY LEAD: Wee Wasps Vanquish Big Bad Beetles ----------- ARS News Service Agricultural Research Service, USDA Linda McGraw, (309) 681-6530, lmcgraw@asrr.arsusda.gov October 27, 1999 ----------- Good things really do come in small packages. Just ask Agricultural Research Service entomologists in Manhattan, Kan., who found that tiny, normally harmless wasps about a quarter-inch long can control insect pests in stored grains. Biological control is an important part of integrated pest management for stored commodities such as wheat, corn, or grain sorghum, according to Paul W. Flinn and David W. Hagstrum of ARS' Grain Marketing and Production Research Center. Damage caused by larvae of the lesser grain borer, rice weevil and maize weevil costs the U.S. wheat industry millions of dollars annually. The tiny wasps, Theocolax elegans, don't feed on grain but on lesser grain borer larvae that typically attack commodities stored in bins and elevators. For their study, the researchers used six 1,000-bushel bins filled with wheat. They released the parasitic wasps into three of the bins. Next, they released lesser grain borers into all six bins. After 131 days of storage, the beetles were reduced by 91 percent in the treated bins compared to the bins without wasps. The Manhattan researchers then milled the wheat flour and sent it to the Federal Grain Inspection Service in Kansas City, Mo. FGIS analyzed it for insect fragments. Flour from the wheat exposed to wasps had 89 percent fewer insect fragments than flour from the control bins. That's because the harmless adult wasps stay outside the grain kernels, so they are easily removed when grain is cleaned in flour mills. ---------- Scientific contact: Paul W. Flinn, ARS Grain Marketing and Production Research Center, 1515 College Avenue, Manhattan, KS 66502, phone (785) 776-2707, fax (785) 537-5594, flinn@usgrmrl.ksu.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 http://www.ars.usda.gov/is/pr/thelatest.htm. * Feedback and questions to ARS News Service via e-mail: isnv@ars-grin.gov. * ARS Information Staff, 5601 Sunnyside Ave., Room 1-2251, Beltsville MD 20705-5128, (301) 504- 1617, fax 504-1648.