Slide Presentation

TITLE    (click title to view slides)
Peanut Response to Forestry Herbicides: Imazapyr and Triclopyr

AUTHOR
Chad Abbott
Graduate Student
University of Georgia

Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')
• PowerPoint - 6.9 MB
• PDF - 3.2 MB

TABLE OF CONTENTS
  1. Peanut Response to Forestry Herbicides: Imazapyr and Triclopyr
  2. Georgia Pines and Peanuts
  3. Accidental Drift and Extension Calls
  4. Statement of Objective and Hypothesis
  5. Materials and Methods
  6. Materials and Methods
  7. Cadre (imazapic/AC-263,222) vs. Pursuit (imazethapyr) vs. Arsenal (imazapyr)
  8. Peanut Response to Imazapyr - Applied 28 DAP
  9. Imazapyr Plant Density: 17 DAP
  10. Imazapyr Stunting and Chlorosis: 61 DAP
  11. Imazapyr Plant Measurements: 64 DAP
  12. Imazapyr Yield
  13. Imazapyr Summary
  14. Peanut Response to Triclopyr Applied @ 28 DAP - 1 DAT
  15. Peanut Response to Triclopyr - Applied 28 DAP
  16. Triclopyr Plant Density: 17 DAP
  17. Triclopyr Plant Stunting: 63 DAP
  18. Triclopyr Plant Heights: 64 DAP
  19. Triclopyr Plant Widths: 64 DAP
  20. Triclopyr Yield
  21. Triclopyr Summary
  22. Hypothesis, Other Relevant Research, and Future Research
  23. Thank You! Questions?



SLIDE CONTENTS
  1. Peanut Response to Forestry Herbicides: Imazapyr and Triclopyr Chad Abbott Dr. Eric Prostko
  2. 4,451,542 ha in pine production 1,677,539 ha in natural 2,805,099 ha in planted 67% in loblolly/shortleaf 33% in longleaf/slash Lumber, pulp, telephone poles, straw, toiletries, cleaning products 35,180 ha Evergreen Forest in Mitchell County, GA Source: Brandeis, Thomas J.; McCollum, Joe; Hartsell, Andy; Brandeis, Consuelo; Rose, Anita K.; Oswalt, Sonja N.; Vogt, James T. (JT); Marcano-Vega, Humfredo. 2016. Georgia's Forests, 2014. Resource Bulletin SRS-209. Asheville, NC: U.S. Department of Agriculture Forest Service, Southern Research Station. 78 p. Georgia Pines 335,889 ha planted Averaged 5040 kg/ha 18,871 ha peanut in Mitchell County, GA 1.86 ha Evergreen Forest : 1 ha Peanut Sources: NASS 2021; https://quickstats.nass.usda.gov/results/18D9DF74-F8EE-3E43-BF25-4B2E6F24E512 Peanuts
  3. Accidental Drift and Extension Calls Peanut Field Surrounded by Pine Trees – Bulloch Co? (July 2020)? Aerial applications: Site prep; HWC; CRP Poured/Drifted into irrigation ponds
  4. The objective of this research was to determine the effects of PRE and POST applications of imazapyr and triclopyr on peanut. Statement of Objective Our hypothesis is that imazapyr and triclopyr will impact peanut growth and yield depending on rate and time of application (PRE or POST). Hypothesis
  5. Materials and Methods 2020 – 2021 in Ty Ty, GA Two different studies Treatments arranged in CRD, 4 replications 3 (Time) X 4 (Rate) Factorial Plots planted in twin-row configuration on 1.83 m x 7.62 m beds Maintained Weed-Free Peanut Variety: GA-06G Herbicide Rates and Timings: PRE (1 DAP), 28 DAP, 58 DAP Imazapyr: 0, 4.2 (1/100th X), 42 (1/10th X), 420 g ai ha-1 (1X) Arsenal Powerline 2AS Triclopyr: 0, 8.4 (1/100th X), 84 (1/10th X), 840 g ai ha-1 (1X) Garlon 3A Standard small plot application techniques
  6. Materials and Methods Peanut plant density: 17 days after planting (DAP) Peanut stunting/chlorosis: 61-63 DAP Plant height and widths: 64 DAP Yield and percent yield loss Data subjected to ANOVA using PROC GLIMMIX, SAS 9.4; means separated using Tukey-Kramer HSD (P=0.05) No interaction between years Imazapyr: No Rate * Timing: Main Effect of Rate; Timing NS Triclopyr: Rate * Timing
  7. Cadre (imazapic/AC-263,222) vs. Pursuit (imazethapyr) vs. Arsenal (imazapyr). Structurally not that different but…….. June – 26; 60 DAP 1X Rate: 28 DAP
  8. Peanut Response to Imazapyr – Applied 28 DAP July – 2; 66 DAP 0 1/100th X 1/10th X 1 X
  9. Imazapyr Plant Density: 17 DAP P=0.0812
  10. Imazapyr Stunting and Chlorosis: 61 DAP P<.0001
  11. Imazapyr Plant Measurements: 64 DAP P<.0001
  12. Imazapyr Yield 15% 67% P<.0001
  13. Imazapyr Summary Plant density was not impacted by any rate 1/10th and 1X rate regardless of timing caused: Significant stunting and chlorosis (1X rate) Significant reductions in plant canopy Significant Yield loss Drift Rates =1/100th X should not cause significant yield loss Half-life various: 25 -142 days in soil, 2 – 3 days in shallow ponds
  14. Peanut Response to Triclopyr Applied @ 28 DAP – 1 DAT May – 26 1/100thX 1/10thX 1X
  15. Peanut Response to Triclopyr – Applied 28 DAP July – 2; 66 DAP 0 1/100th X 1/10th X 1 X
  16. Triclopyr Plant Density: 17 DAP P<.0001
  17. Triclopyr Plant Stunting: 63 DAP P<.0001
  18. Triclopyr Plant Heights: 64 DAP P<.0001
  19. Triclopyr Plant Widths: 64 DAP P<.0001
  20. Triclopyr Yield P<.0001 15% 45% 57%
  21. Triclopyr Summary 1X rate = Yield loss 15 – 57% depending on timing 1X rate at 28 DAP = greatest injury to plant canopy 1X rate at 58 DAP = greatest yield loss Drift rates =1/10th X should not cause significant yield loss Less injurious than Imazapyr Half-life various: 10 - 46 days in soil, ~10 hours in shallow ponds @ 25 °C
  22. Other Relevant Research Carter, O. W., Prostko, E. P. 2020. The Effect of Picloram Plus 2,4-Dichlorphenoxyacetic Acid on Peanut Growth and Yield. Peanut Science. 47:111-114 Future Research Continue research in 2022 Implement a 1/5th X Rate for regression analysis (2021 and 2022) Hypothesis Our hypothesis is that imazapyr and triclopyr will impact peanut growth and yield depending on rate and time from PRE or POST applications. Fail to Reject “Peanut fields unintentionally exposed to picloram + 2,4-D rates = 1/100thX can exhibit typical injury symptoms but most likely will not experience yield losses.
  23. ccabbott@uga.edu Thank You! Questions?