2016 Southern Consultants Meeting Weed Control Solutions Battling Resistance

Transcription

1 2016 Southern Consultants Meeting Weed Control Solutions Battling Resistance Dickie Edmund February 25, 2016

2 Key Glyphosate Resistant Species in the Mid-South Area: Alabama Arkansas Kentucky Louisiana Mississippi Missouri Tennessee Annual Bluegrass Annual Bluegrass Common Ragweed Common Ragweed Common Waterhemp Common Waterhemp Common Waterhemp Giant Ragweed Giant Ragweed Giant Ragweed Giant Ragweed Goosegrass Goosegrass Italian Ryegrass Italian Ryegrass* Italian Ryegrass Johnsongrass Johnsongrass Johnsongrass Marestail Marestail Marestail* Marestail Marestail Marestail Palmer Amaranth Palmer Amaranth Palmer Amaranth* Palmer Amaranth Palmer Amaranth Palmer Amaranth Palmer Amaranth Spiny Amaranth * Not officially confirmed by University

3 Weed Control Solutions Battling Resistance Palmer Amaranth the dominant resistance species

4 Managing Multiple MOA- R Palmer Amaranth Palmer amaranth has developed resistance to multiple modes of action in the United States over the last 25 years: DNA s (1989) PS II Inhibitors (1993) ALS Chemistry (1994) Glyphosate (2006) HPPD s (2009) PPO s (2011, > 2015) Due to this species diversity, ability to adapt, extreme reproductive capacity, rapid growth rate, and highly competitive nature, it poses a significant challenge to row crop agriculture. Therefore, a comprehensive management strategy is required to successfully manage this pest. Confirmed resistance to the PPO herbicides (Group 14) requires a reassessment and overhaul of current soybean herbicide programs.

5 Managing Multiple MOA- R Palmer Amaranth Key DuPont Crop Protection products used as part of a comprehensive management strategy for control of Palmer amaranth: Early Preplant Burndown Herbicides DuPont Canopy EX herbicide DuPont LeadOff herbicide DuPont Afforia herbicide DuPont FirstShot SG herbicide At- Planting Herbicides DuPont Canopy herbicide DuPont Trivence herbicide DuPont Envive herbicide Early Postemergence DuPont Classic herbicide DuPont Synchrony XP herbicide (add on for improved control of morningglory, hemp sesbania, & yellow nutsedge)

6 Managing Multiple MOA- R Palmer Amaranth Implement an effective early preplant burndown program Need to be completely clean of winter vegetation at- planting Increases performance of at- planting applications, both contact and residual Plant early Get ahead of the primary germination period and rapid growth phase of palmer amaranth Better chance of activating rainfall, overall better moisture conditions and positive environment Manage for quick canopy closure Plant aggressive varieties Planting pattern (minimum twins on 38 rows) Overlap residual herbicides with timely applications Early Preplant contact & residual to manage winter vegetation At- Planting contact & residual, mulitple MOA s with residual Early Post automatic at days post- planting, contact & residual, again multiple MOA s are needed

7 Early Preplant Burndown Herbicides - Quick Review: Canopy EX 1.5 oz/a, strong burndown plus long residual, soybeans only LeadOff oz/a, strong burndown plus long residual for corn, cotton & soybean (cotton & soybean - 30 to 60 days preplant, rate dependent); no grain sorghum Afforia 2.5 oz/a, strong burndown plus moderate residual for corn, cotton, soy, grain sorghum & rice FirstShot 0.75 oz/a, strong burndown, limited residual, any crop - Apply in combination with glyphosate plus 2,- 4- D. Read and follow all label directions. 7

8 Must be clean at planting timing is everything! Applied January DAT Applied April 1 20 DAT Glyphosate + 2,4-D + Canopy EX (same with LeadOff ) Slide taken April 21;; Crawfordsville, AR

9 Emerging Palmer amaranth presents a small target

10 DuPont LeadOff herbicide Boyce, LA LeadOff 1.5 oz/a + glyphosate + 2,4-D Applied Dec. 7 Photo taken Jan DAT

11 Managing Multiple MOA- R Palmer Amaranth Implement an effective early preplant burndown program Need to be completely clean of winter vegetation at- planting Increases performance of at- planting applications, both contact and residual Plant early Get ahead of the primary germination period and rapid growth phase of palmer amaranth Better chance of activating rainfall, overall better moisture conditions and positive environment Manage for quick canopy closure Plant aggressive varieties Planting pattern (minimum twins on 38 rows) Overlap residual herbicides with timely applications Early Preplant contact & residual to manage winter vegetation At- Planting contact & residual, mulitple MOA s with residual Early Post automatic at days post- planting, contact & residual, again multiple MOA s are needed

12 Plant Early Average Monthly Rainfall - Arkansas Inches Source: NOAA March April May June

13 Managing Multiple MOA- R Palmer Amaranth Implement an effective early preplant burndown program Need to be completely clean of winter vegetation at- planting Increases performance of at- planting applications, both contact and residual Plant early Get ahead of the primary germination period and rapid growth phase of palmer amaranth Better chance of activating rainfall, overall better moisture conditions and positive environment Manage for quick canopy closure Plant aggressive varieties Planting pattern (minimum twins on 38 rows) Overlap residual herbicides with timely applications Early Preplant contact & residual to manage winter vegetation At- Planting contact & residual, mulitple effective MOA s with residual Early Post automatic at days post- planting, contact & residual, again multiple MOA s are needed

14 Herbicide Program Timings Winter Weed Management Early PreplantBurndown November through March Palmer amaranth, Other summer annuals At Planting 14 Days Preplant through Preemergence Early Post Days After Planting Final residual layer, All species

15 Map of Confirmed PPO- R locations by County in the Mid- South Mid- South University Weed Scientists Feb, 2016

16 Confirmed / Suspected PPO- Resistant Palmer Amaranth Start clean Include Gramoxone SL in your at- planting application Plant Liberty Link soybeans, if available Provides an effective postemergence in- crop MOA Implement a strong at- planting application Soil ph < or = 7 Canopy 6 oz/a plus Metolachlor 1 pt/a or Zidua 1.5 oz/a Trivence 8 oz/a plus Zidua 1.5 oz/a Soil ph > 7 Canopy oz/a + Boundary 1.5 pt/a Trivence 6 oz/a + Zidua 1.5 oz/a day post- planting (automatic application) Liberty Link Liberty 280 SL plus Prefix (preferred) or Metolachlor Roundup Ready Glyphosate plus Prefix

17 Confirmed / Suspected PPO- Resistant Palmer Amaranth At- Planting with soil ph < or = 7 Canopy 6 oz/a plus Metolachlor 1 pt/a or Zidua 1.5 oz/a 3 MOA (with Gramoxone SL, 4 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Strong residual Rotational flexibility for row crops & rice Trivence 8 oz/a plus Zidua 1.5 oz/a 4 MOA (with Gramoxone SL, 5 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Strong residual Rotational intervals for row crops & rice Corn 10 months Rice 12 months Cotton & Sorghum 18 months

18 DuPont Canopy herbicide + Cinch herbicide (metolachlor) Untreated Untreated Yellow nutsedge, morningglory, annual grasses Tillar, AR Untreated Palmer amaranth, Crawfordsville, AR Annual grasses, morningglory, prickly sida England, AR Canopy 4 oz/a + Cinch (S- metolachlor) 1 pt/a 3 modes of action Use 6 oz on medium to heavy soils Very broad spectrum Annual grasses Small- and large- seeded broadleaf weeds Good yellow nutsedge sedge activity Excellent Palmer amaranth treatment Pictures taken 4-6 weeks after treatment

19 Confirmed / Suspected PPO- Resistant Palmer Amaranth At- Planting with soil ph > 7 Canopy oz/a + Boundary 1.5 pt/a 3 MOA (with Gramoxone SL, 4 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Good residual Rotational restrictions for row crops & rice (outside normal intervals) Canopy 2.25 none, > 2.25 rice 18 months Boundary cotton & grain sorghum 12 months Trivence 6 oz/a plus Zidua 1.5 oz/a 4 MOA (with Gramoxone SL, 5 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Strong residual Rotational intervals for row crops & rice Corn 10 months Rice 12 months (no additional CE) Cotton & Sorghum 18 months

20 Non- PPO Herbicide Program for soil ph > 7 Canopy 6 oz/a + Metolachlor 1 pt/a SWH ; England, AR Applied Pre 5/23 Pictures taken 6/19 26 DAT Untreated Check Boundary 1.5 pt/a Add Canopy oz/a to Boundary for improved control of broadleaf weeds Palmer, MG, HS, PS, & Yellow Nutsedge Rotational restrictions for row crops & rice (outside normal intervals) - Canopy 2.25 none, > 2.25 rice 18 months - Boundary cotton & grain sorghum 12 months

21 PPO- Susceptible Palmer Amaranth Start clean Include Gramoxone SL in your at- planting application Plant soybeans of your choice Implement a strong at- planting application Soil ph < or = 7 Envive 3.5 oz/a (can add Zidua 1.5 oz/a) Canopy 6 oz/a plus Metolachlor 1 pt/a or Zidua 1.5 oz/a Trivence 8 oz/a (can add Zidua 1.5 oz/a) Soil ph > 7 Envive 2 oz/a plus Valor 1 oz/a (can add Zidua 1.5 oz/a) Canopy oz/a plus Boundary 1.5 pt/a Trivence 6 oz/a (can add Zidua 1.5 oz/a) day post- planting (automatic application) Roundup Ready Glyphosate plus Prefix Liberty Link Liberty 280 SL plus Prefix (preferred) or Metolachlor

22 PPO- Susceptible Palmer Amaranth At- Planting with soil ph < or = 7 Envive 3.5 oz/a 2 MOA (with Gramoxone SL, 3 MOA) Excellent bdlf weed control with good grass activity Strong residual Rotational flexibility for row crops & rice Canopy 6 oz/a plus Metolachlor 1 pt/a or Zidua 1.5 oz/a 3 MOA (with Gramoxone SL, 4 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Strong residual Rotational flexibility for row crops & rice Trivence 8 oz/a 3 MOA (with Gramoxone SL, 4 MOA) Broad spectrum excellent bdlf weed control with good grass & nutsedge activity Strong residual Rotational intervals for row crops & rice Corn 10 months Rice 12 months Cotton & Sorghum 18 months

23 DuPont Envive Herbicide SWH Crawfordsville, AR Envive 3.5 oz/a Applied 5/1/13, 27 Days preplant to clean beds Planted 5/28/13 Gly + Prefix early post on 6/13/13 Photo taken 7/25/13, 42 days after EPost Untreated Check ALS & Gly- Resistence Population

24 DuPont Soybean Herbicides Full- season resistance management program for Palmer amaranth, waterhemp, marestail and general weed control Canopy EX 1 oz/a + glyphosate + 2,4- D Applied EPP March 18 - fb- Envive 3.5 oz/a + Liberty (glufosinate) 32 oz/a Applied PRE May 12 - fb- FlexStar GT 3 pt/a Applied POST June 9 Photo taken June 23 Glyphosate- resistant marestail, glyphosate- resistant & ALS- resistant Palmer Planted May 8 SWH ; Crawfordsville, AR Untreated Check

25 DuPont Trivence Herbicide SWH Crawfordsville, AR Trivence 8 oz/a Applied 5/1/13, 27 Days preplant to clean beds Planted 5/28/13 Gly + Prefix early post on 6/13/13 Photo taken 7/25/13, 42 days after EPost Untreated Check

26 DuPont Trivence Herbicide SWH Crawfordsville, AR Planted 5/15/13 Trivence 8 oz/a Applied 5/15/13, Preemergence to clean beds Liberty 29 oz/a + Cinch 1 pt/a early post on 6/07/13 Photo taken 7/25/13, 48 days after EPost Untreated Check

27 PPO- Susceptible Palmer Amaranth At- planting with soil ph > 7 Envive 2 oz/a plus Valor 1 oz/a 2 MOA (with Gramoxone SL, 3 MOA) Excellent bdlf weed control with good grass activity Strong residual Rotational flexibility for row crops & rice (rice 10 months with no additional CE) Canopy oz/a + Boundary 1.5 pt/a 3 MOA (with Gramoxone SL, 4 MOA) Broad spectrum controls many grass & bdlf weeds, nutsedge activity Good residual Rotational restrictions for row crops & rice (outside normal intervals) Canopy 2.25 none, > 2.25 rice 18 months Boundary cotton & grain sorghum 12 months Trivence 6 oz/a 3 MOA (with Gramoxone SL, 4 MOA) Excellent bdlf weed control with good grass activity Strong residual Rotational intervals for row crops & rice Corn 10 months Rice 12 months (no additional CE) Cotton & Sorghum 18 months

28 Managing Multiple MOA- R Palmer Amaranth Implement an effective early preplant burndown program Need to be completely clean of winter vegetation at- planting Increases performance of at- planting applications, both contact and residual Plant early Get ahead of the primary germination period and rapid growth phase of palmer amaranth Better chance of activating rainfall, overall better moisture conditions and positive environment Manage for quick canopy closure Plant aggressive varieties Planting pattern (minimum twins on 38 rows) Overlap residual herbicides with timely applications Early Preplant contact & residual to manage winter vegetation At- Planting contact & residual, mulitple MOA s with residual Early Post automatic at days post- planting, contact & residual, again multiple MOA s are needed

29 Always read and follow all label directions and precautions for use. Unless indicated, Trademarks with, or sm are trademarks of DuPont or affiliates DuPont. Valor (Valent); Boundary, Gramoxone, and Prefix (Syngenta); Roundup Ready (Monsanto); Zidua (BASF); Liberty Link and Liberty (Bayer)

30 THANK YOU