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AUTHOR
E. P. Prostko   and  A. S. Culpepper
Dept. Crop & Soil Science
University of Georgia

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TABLE OF CONTENTS
  1. Conducting Harvest-Aid Research in Corn
  2. Field Corn Production in Georgia
  3. Top 10 Most Troublesome Weeds in Georgia Corn
  4. Why are late-season weeds a problem in the SE?
  5. Weeds Picture
  6. Weeds Picture
  7. Objective
  8. Research Problems and Concerns?
  9. Plot Size/Layout/Design
  10. Weed Species
  11. Application Techniques
  12. 4 row boom attached to High-Boy sprayer
  13. CO2 tank, spray cans, on-off valve
  14. Sprayer Picture
  15. Sprayer Picture
  16. Sprayer Picture
  17. Sprayer Picture
  18. Weed Size At Application - 90 DAP
  19. Harvest-Ability Ratings
  20. Results
  21. Corn Harvest-Ability Ratings - 14 DAT
  22. Untreated
  23. Aim 2EC @ 1.0 ozs/A + COC @ 1% v/v
  24. Aim 2EC @ 1.6 ozs/A + COC @ 1% v/v
  25. 2,4-D @ 1.5 pts/A
  26. Roundup WeatherMax @ 22 ozs/A
  27. Harvade 5F @ 8 ozs/A + COC @ 0.83% v/v
  28. Tips for Future Research
  29. UGA Extension Weed Science



SLIDE CONTENTS
  1. Conducting Harvest-Aid Research in Corn E.P. Prostko and A.S. Culpepper Dept. Crop & Soil Science University of Georgia WSSA 2004
  2. Field Corn Production in Georgia 340,000 A planted (03) 55% irrigated 45% dryland 1999-2003 Avg yields * 118 Bu/A - grain * 16 tons/A - silage Source: GASS
  3. Top 10 Most Troublesome Weeds in Georgia Corn TX panicum sicklepod morningglories pigweeds nutsedges cocklebur FL beggarweed crabgrass johnsongrass PA smartweed Webster and MacDonald, 1999
  4. Why are late-season weeds a problem in the SE? early harvest (Jul-Aug) warm temperatures ample rainfall high humidity wider rows (36) limited herbicide inputs reduced atrazine residual delayed applications earlier in season
  5. Objective to develop a method for conducting small plot harvest-aid research
  6. Research Problems and Concerns? no previous experience plot size/layout design/treatment # How do we spray? water volume weed species harvest-ability ratings
  7. Plot Size/Layout/Design RCB 4 reps 6 treatments 4 rows X 25 10 alleys driveways Sweet Corn Hybrid * ACX-9454 *Why? It was short! Planted April 14
  8. Weed Species planted annual morningglory Dual II Magnum @ 1 pt/A - PRE Prowl @ 2.4 pts/A - 9 DAP cocklebur, sicklepod, starbur problems should have sprayed with Basagran or done some hand-weeding
  9. Application Techniques July 14 (3 months after planting) JD 6500 High-Boy Sprayer 4 row boom (18) XR110015 nozzles 5 GPA 4.5 MPH flushed boom with clean water and CO2 after each treatment
  10. 4 row boom attached to High-Boy sprayer
  11. CO2 tank, spray cans, on-off valve
  12. Weed Size At Application - 90 DAP
  13. Harvest-Ability Ratings subjective rating ease of mechanical harvest 1-5 scale 1 = no problem 5 = severe problem
  14. Results
  15. Corn Harvest-Ability Ratings - 14 DAT 1-5 Scale a a bc b bc c
  16. Untreated
  17. Aim 2EC @ 1.0 ozs/A + COC @ 1% v/v
  18. Aim 2EC @ 1.6 ozs/A + COC @ 1% v/v
  19. 2,4-D @ 1.5 pts/A
  20. Roundup WeatherMax @ 22 ozs/A
  21. Harvade 5F @ 8 ozs/A + COC @ 0.83% v/v
  22. Tips for Future Research limit number of treatments (< 10) need to add sodium chlorate control undesirable weeds identify a short field corn hybrid (mechanical harvest) longer alleyways (15) get better at rating for defoliation/desiccation conscious of drift possible funding???
  23. University of Georgia Extension Weed Science (gaweed.com)