SCG > Sustainable Agriculture & Forestry Programs > Integrated Pest Management Program > Funding > 2002-2003 Final Reports > Walker
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2002 - 2003 CUIPM Grants -
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| Tommy Walker County Agent - Cotton, Hampton County P.O. Box 1089 Ridgeland, SC 29936 Dr. Mike Sullivan, Research Entomologist 64 Research Road Blackville, SC 29817 Dr. S.G. Turnipseed, Research Entomologist 64 Research Road Blackville, SC 29817 |
Mr. Dan Robinson, Research Assistant 64 Research Road Blackville, SC 29817 Ms. Amy Gibson, M.S. Student 64 Research Road Blackville, SC 29817 |
Bollgard II cotton varieties became available for planting on a limited basis this year. Field work at Edisto REC and Hampton County supported previous research which showed the variety 468 BGII/RR did not need to be sprayed for our primary lepidopterous pest, the cotton bollworm. However, South of the Lakes BGII cotton did need to be sprayed 1-3 times for piercing sucking insect control (primarily stink bug & Lygus/fleahopper). Final yields and an economic comparison will suggest a value of Bollgard II in currently available varieties.
HAMPTON COUNTY
Bollgard II was evaluated at three (3) locations in Hampton County in 2003 as follows:
Field I: (War-Front 50 acres) - 36 row plots x 1500 ft long - 5415 RR, 468 BGII /RR and 458 BG/RR
Field II: (War-Back 20 acres) - 36 row plots x 600 ft. long - 5415 RR, 468 BGII /RR, 458 BG/RR, 555 BG/RR.
Field III: (Rogers - 15 acres) - 36 row plots x 600 ft. long - 555 BG/RR, 458 BG/RR, 468 BGII /RR, and 5415 RR.
Insects were monitored by modified whole plant examinations and insecticide sprays applied to maximize grower dollar return with the understanding that 468 BGII /RR would not be sprayed for any lepidopterous pest without first notifying Monsanto.
The conventional 5415 RR was treated 5x with synthetic pyrethroids, with the organophosphate Bidrin added to the last 2-3 sprays for piercing - sucking insects. The 458 BG/RR and 555 R BG/RR were sprayed 3-4x with synthetic pyrethroids with Bidrin added to the last 2-3 sprays. 468 BG11/RR did not need treatment for any "worms" but was sprayed 2-3x with Bidrin for piercing - sucking insect control.
Preliminary yield estimates (based on seed cotton weights and 40% gin turnout) are as follows:
VARIETY - LBS. Lint/Acre
| Locations | 5415 RR | 468 | 458 | 555 |
| Field I | 1055 | 1185 | 1162 | 989 |
| Field II | 969 | 1172 | 1043 | -- |
| Field III | 1201 | 1299 | 1575 | 1670 |
Seed cotton samples will be ginned and graded and a final dollar value assigned to each variety. This return will be compared to dollar input per acre for each variety.
These results support previous studies regarding the efficacy of the Bollgard II technology versus our major lep pests. Dollar input return analyses will shed light the value of this technology.
EDISTO REC
Two split fields (one 14 acres and one 20 acres) were planted to 468 BGII/RR and 5415 RR in 2003 at the Edisto REC. Ten sampling stations were set up in each half of each field for the purpose of sampling insects during the growing season. Beat cloth samples were taken weekly from late June through August. After boll set, boll samples were taken to observe piercing/sucking insect damage. Each variety was treated as needed for lepidopterous pest (primarily cotton bollworm) and piercing/sucking pest (lygus bugs and stink bugs). The conventional 5415 was treated 5x bollworm; the transgenic 468 was treated 2x for piercing sucking bugs. Synthetic pyrethroid sprays on 5415 also controlled piercing/sucking bugs. The 468 never needed any treatment for cotton bollworm. Yields will be taken.
The results from these studies collaborated previous studies; namely, 468 BGII does not need treatment for our major lepidopeterous cotton pest, cotton bollworm. However, below the lakes, this transgenic variety will need from 1-3 applications of insecticide for piercing/sucking bug pests. Bollgard II also is very effective against other lepidopterous cotton pests (fall and beet armyworm, soybean looper).
Four separate small plot test for piercing/sucking pest were established using 468 BGII; this was done to eliminate treatments for cotton bollworm. A yield differences can then be attributed to piercing/sucking pest only.
Questions or comments:
Amy Nichols
Associate Coordinator
IPM and
Sustainable Agriculture
Programs
Contact
Dr. Geoffrey Zehnder
Professor of Entomology, Soils & Plant Sciences
IPM and
Sustainable Agriculture
Programs
114 Long Hall, Box 340315
Clemson, SC 29634-0315
864 - 656 - 6644
Contact
Last revised:
8/4/2006
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