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DUPONT HERBICIDE

DUPONT HERBICIDE PROGRAMS FOR WATERHEMP AND PALMER AMARANTH CONTROL IN DICAMBA-TOLERANT SOYBEANS – TECHNICAL SUMMARY return to table of contents Dave Johnson, Ph.D., Eric Castner, M.S., Robert Rupp, M.S., Richard Edmund, M.S., Dan Smith, M.S., Jeff Krumm, Ph.D., Kevin Hahn, Ph.D., Bruce Steward, Ph.D., Mike Meyer, Ph.D., Kelly Backscheider, Ph.D., and Victoria Kleczewski, Ph.D., DuPont Crop Protection WATERHEMP AND PALMER AMARANTH • #1 weed problem in many areas • Populations have developed resistance to multiple herbicide sites of action, including ALS, EPSPS, PSII, PPO, HPPD, synthetic auxins, and mitosis inhibitors. • Both species are obligate out-crossers and prolific seed producers with a wide germination period. Waterhemp Resistance by Herbicide Site of Action ALS Inhibitors (Group 2) EPSPS Inhibitors (Group 9) PPO Inhibitors (Group 14) PSII Inhibitors (Group 5 & Group 7) HPPD Inhibitors (Group 27) Synthetic Auxins (Group 4) Palmer Amaranth Resistance by Herbicide Site of Action ALS Inhibitors (Group 2) EPSPS Inhibitors (Group 9) PPO Inhibitors (Group 14) PSII Inhibitors (Group 5 & Group 7) HPPD Inhibitors (Group 27) Mitosis Inhibitors (Group 3) MANAGING WATERHEMP AND PALMER AMARANTH • Start clean at planting – use tillage or effective burndown herbicides. • Get to canopy closure as quickly as possible and weed-free. »» Narrow rows »» Good early season growth • Use 2-pass (minimum) herbicide programs with multiple effective modes of action and overlapping residuals. »» Residual pre-emergence herbicides »» Include residual in post-emergence treatments • Timely post-emergence application – weeds 4 inches tall or less • Cultivate where possible and manually remove escapes. • Clean equipment to reduce movement of weed seed. • Control weeds after harvest. • Goal: prevent weed seed production DUPONT FeXapan HERBICIDE PLUS VaporGrip TECHNOLOGY • Low-volatility dicamba formulation from DuPont • Designed for reduced volatility compared to older commercial dicamba formulations • New mode of action for in-crop use in soybeans with the dicamba-tolerant trait (label pending EPA approval) • Currently labeled for other crops (e.g., corn, sorghum, cereals, etc) • Use as part of a program with other herbicides and weed control techniques. • Follow all stewardship requirements on final, approved label and all local regulations to help minimize off-target movement. RESEARCH OBJECTIVE • Evaluate weed control efficacy and crop tolerance of DuPont herbicide programs for waterhemp and Palmer amaranth control in dicamba-tolerant soybeans 146

eturn to table of contents STUDY DESCRIPTION • DuPont field trials in 2016: »» 9 southern locations (7 with waterhemp or Palmer amaranth) »» 6 central locations (4 with waterhemp or Palmer amaranth) »» 5 northern locations (2 with waterhemp or Palmer amaranth) »» Randomized complete block design with 3 replications • Herbicide applications: »» Pre-emergence (PRE): immediately after planting »» Post-emergence (POST): 2 to 4-inch weeds »» Adjuvants: none »» Nozzles: TTI at 10-20 gallons/acre • Evaluations: »» Crop tolerance: 0, 7, 14, and 28 days after POST treatment. »» Weed control: 0, 14, 28, and 42 days after POST treatment. Table 1. Commercial names and active ingredients of herbicides used in pre-emergence (PRE) treatments in 2016 DuPont field studies. Herbicide Active Ingredients RESULTS Southern Locations Table 3. PRE and POST herbicide treatments used at southern locations. TRT PRE Herbicide PRE Rate (per acre) POST Herbicide* POST Rate (per acre) 1 Roundup PowerMAX Herbicide (RUPM) DuPont 22 oz 2 Trivence 8 oz RUPM + FeXapan † 22 oz + 22 oz Herbicide 3 4 RUPM + FeXapan † + Cinch ‡ RUPM 22 oz + 22 oz + 1 pt 22 oz 5 DuPont RUPM + FeXapan † 22 oz + 22 oz Envive 3.5 oz RUPM + FeXapan 6 † 22 oz + 22 oz Herbicide + Cinch ‡ + 1 pt 7 RUPM + Prefix 2 pt 8 DuPont RUPM 22 oz Canopy ® 9 7.5 oz Blend RUPM + FeXapan † 22 oz + 22 oz + 1 pt Herbicide RUPM + FeXapan 10 † 22 oz + 22 oz + Cinch ‡ + Cinch ‡ + 1 pt 11 Untreated * POST timing: 2-4 inch weeds. Applied as tank mix in this research study. Approved dicamba tank mixes have not been finalized at this time. † DuPont FeXapan herbicide plus VaporGrip Technology. ‡ DuPont Cinch herbicide. DuPont Trivence ® Herbicide DuPont Envive ® Herbicide flumioxazin + chlorimuron-ethyl + metribuzin flumioxazin + chlorimuron-ethyl + thifensulfuron Table 4. Efficacy of weed control treatments at southern locations. Data from locations in OK, IL, KS, NC, AR, TX, and MS. Palmer amaranth at 6 locations, waterhemp at 2 locations. Palmer Amaranth ▲ Waterhemp DuPont Canopy ® Herbicide DuPont Enlite ® Herbicide DuPont Cinch ® Herbicide DuPont Afforia Herbicide chlorimuron-ethyl + metribuzin flumioxazin + chlorimuron-ethyl + thifensulfuron s-metolachlor flumioxazin + thifensulfuron + tribenuron methyl Table 2. Commercial names and active ingredients of herbicides used in post-emergence (POST) treatments in 2016 DuPont field studies. Herbicide Active Ingredients PRE Herbicide DuPont Trivence Herbicide DuPont Envive Herbicide POST Herbicide* Roundup PowerMAX (RUPM) At POST 14 DAT 28 DAT 42 DAT At POST 28 DAT 94 95 93 90 94 85 RUPM + FeXapan † 95 99 99 100 96 96 RUPM + FeXapan † + Cinch ‡ 93 99 99 100 94 99 RUPM 92 96 95 92 85 68 RUPM + FeXapan † 93 99 98 100 87 93 RUPM + FeXapan † + Cinch ‡ 95 99 99 100 87 98 RUPM + Prefix 94 99 99 100 89 86 Roundup PowerMAX ® Herbicide DuPont FeXapan Herbicide Plus VaporGrip Technology DuPont Cinch Herbicide Prefix ® Herbicide glyphosate dicamba s-metolachlor fomesafen + s-metolachlor DuPont RUPM 94 94 91 90 95 86 Canopy ® Blend RUPM + FeXapan † 95 98 96 98 96 95 Herbicide RUPM + FeXapan † + Cinch ‡ 92 99 99 100 97 94 + Cinch ‡ ▲ Glyphosate and ALS resistant, no PPO-resistant populations. * POST timing: 2-4 inch weeds. Applied as tank mix in this research study. Approved dicamba tank mixes have not been finalized at this time. † DuPont FeXapan herbicide plus VaporGrip Technology. ‡ DuPont Cinch herbicide. 147

2015_DuPont_Pioneer_Seed_to_Harvest_Guide
Field Crops - Practical Farmers of Iowa
Corn Work Shop Book - Pioneer
Biotech Crops Reduce Pesticide Use - Conservation Technology ...
Glyphosate Resistance and Other Issues with Round-up Ready Crops
Biology and Management of Waterhemp - Purdue Extension ...
Organic Cash Grain Yields and Economics - Cornell University
“We need a second green revolution” Hybrid rice - Bayer ...
Soybeans are Different Than Corn - University of Missouri Extension
Click HERE to download the "French's 2014 Seed Guide"
The wheat book : principles and practice - Department of Agriculture ...
Corn and Soybean Access to Soil Water in “Drought Years”:
Considerations in Selecting No-Till - Iowa State University Extension ...
Avadex® Xtra - Fight Wild Oat Herbicide Resistance ... - Nufarm
Victorian Winter Crop Summary - Grains Research & Development ...
Beyond the family
Irrigated corn, Lincoln 2003 - Hybrid Maize
Sunflower Production - NDSU Agriculture - North Dakota State ...
Zinc in Fertilizers - International Zinc Association
In this issue..