Source: UNIVERSITY OF GEORGIA submitted to NRP
SCREENING SOYBEAN VARIETIES AND BREEDING LINES FOR STINK BUG RESISTANCE
Sponsoring Institution
State Agricultural Experiment Station
Project Status
COMPLETE
Funding Source
STATE
Reporting Frequency
Annual
Accession No.
0203267
Grant No.
(N/A)
Cumulative Award Amt.
(N/A)
Proposal No.
(N/A)
Multistate No.
(N/A)
Project Start Date
Jul 1, 2004
Project End Date
Jun 30, 2005
Grant Year
(N/A)
Program Code
[(N/A)]- (N/A)
Recipient Organization
UNIVERSITY OF GEORGIA
200 D.W. BROOKS DR
ATHENS,GA 30602-5016
Performing Department
ENTOMOLOGY
Non Technical Summary
Stink bugs are the number one insect pest on Georgia's soybean crop each year. Stink bugs feed directly on soybean seeds causing the seeds to be shriveled and discolored. Insecticidal controls are not very effective because they are short-lived and expensive. This project will examine soybean entries that are resistant to stink bug feeding, thus requiring little or no insecticidal control. The purpose of this project is to provide soybean producers with a new soybean variety that is resistant to stink bug feeding, thus reducing the amount of insecticides that they will need to apply.
Animal Health Component
100%
Research Effort Categories
Basic
(N/A)
Applied
100%
Developmental
(N/A)
Classification

Knowledge Area (KA)Subject of Investigation (SOI)Field of Science (FOS)Percent
21118201130100%
Knowledge Area
211 - Insects, Mites, and Other Arthropods Affecting Plants;

Subject Of Investigation
1820 - Soybean;

Field Of Science
1130 - Entomology and acarology;
Goals / Objectives
To identify soybean breeding lines that are resistant to stink bug feeding and promote the development of one or more of these entries into an acceptable variety.
Project Methods
Replicated field plots, 2 rows x 15 m, will be monitored for stink bug populations in 28 advanced soybean lines that have been selected from previous studies. Each of these lines has IAC 100 in its Pedigree. The IAC 100 soybean variety was developed in Brazil and has resistance to stink bugs. Each plot will be harvested and yield and quality (% of the kernels damaged by stink bugs) will be determined.

Progress 07/01/04 to 06/30/05

Outputs
Stink bugs (primarily southern green, brown and green stink bugs) are the number one pest of Georgia's soybean crop in most years, causing $2-10 million losses annually. Since stink bug crop damage is not detectable until the seeds are harvested, growers are often unaware that economic crop injury has occurred until they see the high incidence of stink bug damaged kernels. A collection of 68 breeding lines selected from over 200 initial crosses available from the Virginia Tech program provided an excellent source of soybean material to screen for stink bug resistance in the initial phase of this research project. From these 68 lines, the top 10 entries with the least stink bug damage, along with the 10 best yielding lines and the 10 lines with the lowest velvetbean caterpillar/soybean looper defoliation were evaluated in 2004. Stink bug damage was high in 2004. Soybean kernels with no stink bug damage ranged from 46.8% to 91.2% and six entries had less than 13.5% damaged kernels. The 100 seed weights ranged from 20.0 gm to 9.4 gm which indicates a vast range in seed size between the 28 entries evaluated for insect resistance. The percent defoliation ranged from 16.3% to 42.5% in 2004. Twelve of the entries had 27.5% or less defoliation which indicates a moderate level of resistance when compared to the entries with the highest percentage. Yields ranged from 1186 to 2263 kg/ha. Several entries will be evaluated in the coming season in an advanced field screening trial plus examined for the mechanism of resistance to stink bug feeding and worm defoliation.

Impacts
Obtaining soybean varieties that contain resistance to insect damage will provide soybean producers with a management tactic that does not depend on insecticidal control. Insecticide applications are expensive, not very effective (especially for controlling stink bugs) and cause environmental concerns. Several entries in this project have demonstrated at least a partial resistance to stink bug and velvetbean caterpillar feeding. All of these entries contain the Brazilian soybean variety IAC 100 in their pedigree. IAC 100 has been reported to be resistant to stink bugs in South America. The resistant lines identified in this project will provide genetic material for future crosses and back crosses to be used in the development of an insect resistant soybean variety.

Publications

  • McPherson, R. M., W. A. Mills, and S. R. Jones. 2005. Control of stink bugs, velvetbean caterpillars, and threecornered alfalfa hoppers on soybeans in Georgia, 2004. Arthropod Management Tests 30: F72 (4pp).
  • McPherson, R. M., J. D. Taylor, and N. J. Roberson. 2005. Control of velvetbean caterpillars on soybeans in Georgia, 2004. Arthropod Management Tests 30: F73 (2pp).
  • Roberts, P. and R.M. McPherson. 2005. Insect Management. Georgia Soybean Production Guide. University of Georgia College Agric. Environ. Sciences Publ. CSS 05-02: 4pp.
  • Roberts, P. and R.M. McPherson. 2005. Soybean insect control. Georgia Soybean Production Guide. University of Georgia College Agric. Environ. Sciences Publ. CSS 05-02: 5pp.
  • McPherson, R. M., P. Roberts and G. Buss. 2005. Screening soybean breeding lines and varieties for stink bug resistance. Georgia Soybean Research-Extension Report 2004. 7pp. www.griffin.uga.edu/caes/soybeans/2004rer/