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
 Southern Insect Management Research: Stoneville, MS
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Southeast Area Stoneville, Mississippi Southern Insect Management 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
                                            Allen, Clintitem
                                            LUTTRELL, R. - UNIV. OF ARKANSASitem
                                            PARKER, JR., C. - NATIONAL COTTON COUNCIL
  Submitted to: Journal of Cotton Science
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 4/1/2009
                                    Publication  Date: 4/1/2009
                                    Citation: Allen, K.C., Luttrell, R.G., Parker, Jr., C.D. 2009. Influence of Within-season Densities of Heliothines and Tarnished  Plant Bugs on Variability in End-of-season Cotton Yield Mapping . Journal of Cotton Science. 13:11-22Interpretive Summary: Plant responses to insect feeding are fundamental to developing economic injury levels, which are a major component of integrated pest management.  Processes such as plant compensation may complicate estimates of injury levels by allowing some damage by insects to occur to immature fruit without reducing final yield.  Multiple experiments were compiled to examine the effect of varying densities of three major insect pests of cotton on ultimate survival and seedcotton weight of particular cotton plant fruits at harvest.  Populations of bollworms and tobacco budworms observed on non-Bt cotton at six different stages of plant development (based on total mainstem plant nodes) were related to decreased survival of fruit within some fruiting cohorts.  Eggs and caterpillars on Bt cotton were related to reduced fruit survival when infestations were present on plants with four and three different total mainstem nodes, respectively.  Based on these relationships, most damage caused by observed populations of bollworm and budworm caterpillars and plant bugs occurred to cotton fruit ranging from 3 to 15 days old at the time of infestation.  Collectively, these data indicate that important insect injury can be followed through the growing season and recorded on end-of-season cotton yield maps.
                                Technical Abstract: Nineteen different experiments were compiled to examine temporal trends in fruit accumulation among various insect related treatments based on end-of-season yield mapping of cotton, Gossypium hirsutum L., plants.  Fourteen of these data sets were used to examine the effect of varying densities of bollworm, Helicoverpa zea (Boddie), tobacco budworm, Heliothis virescens (F.) (heliothines) and tarnished plant bug, Lygus lineolaris (Palisot de Beauvois), on survival and seedcotton weight of particular fruit cohorts at harvest.  Regression equations using only sample dates where insects were present described end-of-season fruit loss better than equations using all insect sample dates.  More fruit loss occurred when populations of heliothines were observed on cotton varieties not expressing an insecticidal protein from Bacillus thuringiensis Berliner (Bt) than Bt varieties.  Populations of heliothines observed on non-Bt cotton at six different stages of plant development (based on total mainstem nodes) were related to decreased survival of fruit within some fruiting cohorts.  Heliothine eggs and larvae on Bt cotton were related to reduced fruit survival when infestations were present on plants with four and three different total mainstem nodes, respectively.  Based on these regression analyses, most damage caused by observed populations of heliothine larvae and plant bugs occurred to cotton squares ranging from 3 to 15 d old at the time of infestation.  Collectively, these data indicate that important insect injury can be followed through the growing season and recorded on end-of-season yield maps.  The dynamic nature of the impact and the probable role of plant compensation further support continued development of dynamic insect thresholds.


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