2016 Cotton Weed Control

Transcription

1 2016 Cotton Weed Control 1. New products/formulations 2. XtendFlex/GlytolLibertyLink/Widestrike 3. Conservation Tillage 4. Auxin Tolerant Technologies 5. Reminder of keys for success

2 Warrant Ultra Herbicide 1. Mix of Warrant + fomesafen (i.e Reflex). 2. Label: preplant, PRE at-planting, & directed. 3. Monsanto literature: fl oz 4. Suggest (38 oz)= 12oz Reflex + 2.2pt Warrant 5. Add ½ pt of Warrant for Roundup system.

3 Glufosinate Formulations - Cotton Slide from Prostko

4 Brake Non-treated 1. Section New chemistry for agronomics. 3. Mix of fluridone and fomesafen (i.e. Reflex). 4. Apply PRE behind press wheel (~16 oz/a). 5. Very good for weeds, costly, watch carryover, systems approach required.

5 1. Similar chemistry as Dual and Warrant. 2. Minimal research in RR or RR/LL cotton. 3. Positioning for dicamba-tolerant cotton? 4. Overtop from 1 leaf 2 nd wk of bloom. 5. Label: up to 21 oz/a; suggest oz/a.

6 1. Similar chemistry as Dual and Warrant. 2. DIRECTED application after 7-leaf cotton. 3. Label: 0.75 to 1.5 oz/a; suggest oz/a mixed with Direx + MSMA for longer and better residual control.

7 1. Valor + Zidua 2. PRECISION DIRECTED, 18+ inch, bark! 3. Label: 3 oz/a 4. Mix with MSMA or Roundup very good but can be hot stuff.

8 Different Tolerance to Liberty??

9 Tolerance to Liberty?? 28 studies Liberty injury less than 15% except for 3 studies conducted under extremely challenging environments.

10 XtendFlex 1553 Ponder Farm June hr after trt Liberty alone 1 X ENVIRONMENT EXTREME FOR INJURY Both cultivars treated with same bottle ST 6448

11 Percent Visual Cotton Injury. 3 DAT. TyTy GA Environment A. ENVIRONMENT EXTREME FOR INJURY ST 6448 DGT-2013 Xtend1553 WRF 499 Liberty Lib + RU Lib + RU + W Liberty = 32 oz/a; Roundup Pmax = 32 oz/a; Warrant = 48 oz/a. No adjuvants; 15 GPA. LSD = 5.34; CV 13.46

12 Using Heavy Rye Covers For Sustainability Rye Cover Weedy Cover

13 RYE CLOVER RESEARCH: RYE & CLOVER STRONG 1. Data suggest killing cover > 10 d before plant. 2. Wet soils first 3 wks after plant hurts; raise bed? 3. Blends don t make sense but research on-going.

14 Delaying Cover Termination Days to 4 Palmer Amaranth POST Application Culpepper and Steckel 2015 Termination Timing by Cover Crop Tifton, GA 2015

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17 Auxin system Auxin Systems Non-treated

18 Seed: handful Herbicide: 1. Overcome synergism issue (endangered species). 2. Will data need to be developed? Seed: lots Herbicide: 1. Comment period? 2. How long it open? 3. Number of comments? COTTON 2016

19 Palmer Control By Liberty/Roundup Based System At Harvest. 5 Loc, GA/NC >96 >99 > % Reflex + Warrant Warrant + Direx Warrant + Cotoran Reflex + Direx Brake F16 POST 1: Roundup + Liberty; POST 2: Roundup + Liberty; LPD: Direx + MSMA

20 Large Acreage Study. Palmer Amaranth Per Acre at Harvest. Georgia d 109 c 0 POST Liberty twice PRE: Reflex + Warrant LPD: Direx + MSMA Lib + RU twice 33 b Lib + RU + Warrant twice 2 a RU + dicamba + Dual twice

21 Auxin Systems Compared to Today: 1. Weed control better, lower herbicide and hand weeding input costs (not much easier). 2. Crop injury (cotton) more complex. 3. Off-target movement more complex

22 Auxin Systems 1. Clean at planting 2. Two Residual PRE s.. 3. Sequential POST s.. 4. Layby

23 1 X Injury in a Challenging Environment (worst 10% of time?) RU + dicamba 2 X

24 Layby.critical to sustainability!! For Palmer: Direx + MSMA; add Envoke for morningglory. If grasses: Roundup + Direx; add Envoke for morningglory.

25 The Balancing Act - Auxins Managing off-target movement More economically effective sustainable programs?

26 UGA s 15 Factors Influencing Success Spray Tip Spray Pressure Sprayer Speed Boom Height Tank Cleanout Drift Control Agent Proper Formulation Wind Land Terrain Humidity Buffers Herbicide Footprint/ Surrounding crops Volatility Size of Crop Residue Tolerance

27 2016: UGA-GDA Trainings Industry can join us if they like! Georgia Department of Agriculture

28 2016 UGA-GDA Classroom Trainings* Feb 22 (Turner/Bacon) Feb 23 (Dooly/Dodge; Brooks/Mitchell) Feb 29 (Early/Terrell; Tattnall+Toombs/Screven) March 1 (/Gordon/Madison; Washington/Emanuel) *Meeting times: ~9 am and ~2 pm except Madison 4 pm. *Training required to spray 2,4-D or dicamba over respective technologies.

29 Using Pesticides Wisely! 2015 Locations Feb 9: Bainbridge; Moultrie Feb 10: Tifton, Cordele Feb 11: Americus Feb 12: Waynesboro; Statesboro Feb 13: Alma Mar 17: Hawkinsville; Tifton Mar 18: Statesboro people trained growers.do not have to retake training

30 Was this training worth your time? All Locations % Yes.9 Grower (#731) 2 No Yes No Yes No Consultant (#46) Other* (#98) 1 *Other consisted of Extension, Workers, Dealers, Ginner, Farm Manager, Research, YF Teacher.

31 Do you think this training will help you reduce pesticide drift issues? All locations % Yes 2 Grower (#735) 2 No Yes No Yes No Consultant (#47) 5 Other* (#96) *Other consisted of Extension, Workers, Dealers, Ginner, Farm Manager, Research, YF Teacher.

32 ALL PESTICIDES Focus is 2,4-D & Dicamba 2016 Extension Trainings Classroom Training One-on-one Training

33 KEYS TO SUCCESS - PALMER 1. Palmer free at planting. 2. Select 2 residual PRE s behind press wheel. 3. Avoid causing injury with Irrigation. A. Ideal plant depth B. Plant into moist soil C. Right rate D. Smart irrigation: once hr after planting; limit it afterwards.

34 KEYS TO SUCCESS 1. Palmer free at planting. 2. Select 2 residual PRE s behind press wheel. 3. Avoid causing injury with Irrigation. 4. Sequential POST applications TIMELY 5. Directed application. 6. Hand weeding. 7. Crop rotation.

35 WHICH SYSTEM IS THE BEST? Roundup System: 1. Clean at planting residual PRE s 3. POST 13 d after plant 4. POST 13 d later 5. Timely Layby RU + Liberty System: 1. Clean at planting residual PRE s 3. POST 17 d after plant 4. POST d later 5. Timely Layby Auxin System: Weed control better; injury more complex; offtarget movement far more complex

36 UGA Extension Education Fund Master s degree from UGA Tifton while working 2 yr in county with agents Or Master s degree from UGA Tifton while working 1 yr in county with agents and 1 yr with specialist

37 UGA Extension Education Fund Extension Faculty Are Committed: 85 K Industry: AmVac Bayer DuPont FMC Gowan Helena NuFarm RW Griffin SePro Southern States Syngenta TKI Triangle Triest United Phos. Valent

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39 Time of Day Impact on Palmer Amaranth Control by Various Herbicides Herbicides 6 AM 7 AM 8 AM 10 AM 12 PM 2 PM 7 PM Liberty XX X X $ $ $ $ X Roundup XX X X $ $ $ $ X Reflex XX X $ $ $ $ $ X 9 PM Direx $ $ $ $ $ $ X XX Clarity XX X $ $ $ $ $ X 2,4-D XX X $ $ $ $ $ X Gramoxone $ $ $ $ $ $ $ $ XX = worst level of control; X = low level of control; $ = highest level of control Times provided in the top row of the table are when applications were made.