U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Integrated Cropping Systems Research: Brookings, SD
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Plains Area Brookings, South Dakota Integrated Cropping Systems Research Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications

Title:   Author  item
                                            French, Bryanitem
                                            Sappington, Thomasitem
                                            Coates, Brad
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/20/2011
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Diabroticite corn rootworms are prominent pests of maize and have adapted to both cultural and chemical management methods. In response to a widely used corn-soybean crop rotation in the U.S. Corn Belt over several years, northern corn rootworm (NCR) populations adapted by increasing the proportion of eggs that diapause (overwinter) for two years. The frequency of eggs diapausing for two years increased with time and prominence of the maize-soybean rotation in the landscape. We investigated the pattern of egg diapause in relation to male and female phenotypes for diapause duration. We collected NCR as pupae from a maize field that had been in a maize-soybean crop rotation for several years. We sexed the pupae and maintained them individually. We also collected pupae from a NCR lab colony that had been selected for one year diapause for several generations. We established reciprocal F1 families from the extended diapause (ED) and one year diapause (D) lines. Eggs obtained from the females were provided two overwintering periods, one each for five months at 8o C. Eggs were allowed to hatch at 25o C for 45 days after each overwintering period. Eggs obtained from ED females had a significantly higher proportion of eggs with the ED trait compared to eggs obtained from D females (F = 4.13 P = 0.015). With a strong female genetic influence on diapause duration in NCR, we can begin selecting for a non-diapausing line to facilitate research on this important pest.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov