2017 Appling County Cotton Meeting. Weed Control and a few other things
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1 2017 Appling County Cotton Meeting Weed Control and a few other things Stanley Culpepper, University of Georgia, Tifton Shane Curry, UGA Extension Appling County
2 County Cotton Update Stanley Culpepper, University of Georgia, Tifton
3 Auxin Systems XtendiMax With Vapor Grip Registered Engenia Enlist Duo (cotton, beans other states)
4 Dicamba Issues for the MidSouth in Hundreds of drift complaints. 2. EPA issues dicamba compliance advisory. 3. Two people are dead (underlying issues). 4. Federal Indictments: 21 Missouri.
5
6 Take Home Message Many fields in GA should not be treated with dicamba or 2,4-D in-season. Liberty + Roundup programs are effective.
7 POST 1: Roundup + Liberty + Residual POST 2: Roundup + Liberty; LPD: Direx + MSMA 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
8 2017 Auxin Systems Restrictions: UPW training, wind speed, spray tip, pressure, downwind buffers, ground speeds, GPA, *tank mixes *specialty crops Auxin Programs 1. Clean at planting 2. PRE Required 3. Sequential POST s 4. Layby:
9 YES, YOU WILL STILL USE PRE EMERGENT HERBICIDES!
10 Auxin Systems Clean At Planting Cover Crop Burndown Tillage
11 Don t Plant into emerged pigweed!
12 Need weeds killed at least a week prior to planting.
13 Burndown: 2,4-D vs Dicamba When Mixed with Roundup Horseweed Primrose Radish Cost Plantback 2,4-D? ,4-D dicamba dicamb
14 Palmer (3-7 ) Control By Burndown Herbicides. Macon, a 86 b % c 25 0 Gramoxone + Direx + COC RU + dicamba RU + dicamba + Valor C Gramoxone, Direx, COC, & Wmax = 1 qt/a; Clarity 16 oz/a; Valor 2 oz/a.
15 Auxin Systems 1. Clean at planting 2. PRE Required 3. Sequential POST s.. 4. Layby:
16 Auxin Systems PRE REQUIRED 1. Resistance management!!!!! 2. Coverage 3. Early-season competition 4. Need no injury concern, low cost ($9.18 without reward)
17 Number of emerged Palmer amaranth/a at 21 d. 55,510 ab # of Palmer per acre 39,650 bc 26,840 c 4270 c 2440 c 4575 c Reflex 16 oz Direx 16 oz Warrant 48 oz Reflex + Direx Reflex + Warrant Direx + Warrant Tank mixes = Reflex 12 oz/a + Direx 12 oz/a or Warrant 2 pt/a; Direx 1 pt/a + Warrant 3 pt/a. The non-treated control consisted of 1,464,000 per acre; LSD 21 K;
18 Palmer Response to PRE s at DAT. 3 Loc % b 98 a 98 a 25 0 Dicamba 0.5 lb + Warrant 48 oz Direx 16 oz + Warrant 48 oz Reflex 12 oz + Warrant 32 oz
19 Does Dicamba or 2,4-D Have A Fit PRE? Engenia/XtendiMax (XtendFlex) 1. Dryland no rain in site? 2. Horseweed? 3. No injury concern for XtendFlex; but less effective in weed control!!! 2,4-D choline (Enlist) 1. No
20 Auxin Systems 1. Clean at planting 2. PRE Required 3. Sequential POST s.. 4. Layby:
21 POST Dicamba Applications in XtendFlex If no tank mix label: then will recommend Liberty + Roundup programs. Non-tank mixes = 1. Rapid resistance development 2. Potentially less weed control 3. More expensive (# trips) 4. More drift 5. More human pesticide exposure
22 If POST Mixes are Labeled 17 & 34 DAP Dicamba Options: POST 1: RU or Lib + Engenia/XtendiMax (+ residual) or POST 1: RU + Liberty + Engenia/XtendiMax POST 2: RU or Liberty + Engenia/XtendiMax ,4-D Options: Awaiting labels
23 1 X Challenging Environment (worst 10% of time?) RU + dicamba 2 X
24 RU or Liberty + Auxin IN A SYSTEM Palmer <4 Competition Grass Cost Prepare Layby Lib RU
25 Liberty + Dicamba 4 above ground Roundup + Dicamba will bend pigweeds (8inch) over and to allow layby application to kill weeds. RU + Dicamba
26 Auxin Systems 1. Clean at planting 2. PRE Required 3. Sequential POST s.. 4. Layby:
27 Layby.critical to sustainability!! For Palmer: Direx + MSMA; add Envoke or dicamba for MG. If grasses: Roundup + Direx; add Envoke or dicamba for MG.
28 Why Would You Risk Injury From Overtop Application After 8 leaf? Overtop Directed
29 Stage of Growth Key to Recovery Gramoxone topically: 40 to 50% damage LSD = NT 4 lf 7 lf 10 lf 15 lf Study maintained weed free. C Sunbelt Expo 2016.
30 Why Would You Risk Not Killing the Pigweed with Overtop App After 8 leaf?
31 Factors Influencing Cotton Injury from Topically Applied Herbicides Herbicide rate Soil moisture Adjuvants Cultivar # products in tank Application time of day Dew Cotton Growth Weather (heat/humidity) Water volume (GPA)
32 Cotton Cultivar Response To Liberty LSD = DP 1646 DP 1522 DP 1538 PHY 24D PHY 499 ST 6182 ST 6448 Liberty applied at 32 oz/a. C7B-16. Injury 3 to 5 DAT. Injury from 1538 and 1553 very similar.
33 Roundup + Liberty + Dicamba Saturated Ideal
34 Percent Injury As Influenced By Soil Moisture Liberty 36 oz/a 60 PHY DP a 24 b a 16 b Ideal Saturated Ideal Saturated
35 Discussion Topics 1. Auxin technologies 2. Cotton injury 3. Conservation tillage
36 RESEARCH: RYE & CLOVER STRONG RYE CLOVER 2016 Research: 1. 3 studies: Cover > Conv lb seed cotton; hot dry fall. 2. Rye or rye + clover system better on weeds (clover melts). 3. Clover needs to be killed well in advance of planting Research: 1. Wet-cold early = conv wins; hot or dry = cover crop wins. 2. Rye or rye/clover blend best; other grains are good.
37 Discussion Topics 1. Auxin technologies 2. Cotton injury 3. Conservation tillage 4. Using pesticides wisely
38 Using Pesticides Wisely Trainings loc Screven: Feb 2 Pierce: Feb 13 Miller: Feb 15 Houston: Feb 17 Bartow: Mar 1
39 Pesticide Card Using Pesticides Wisely
40 2,4-D Salts and Relative Volatility 2,4-D Acid 2,4-D Ester 2,4-D Amine 2,4-D Choline GA study: Amine 95% < volatility damage than Ester V O L A T I L I T Y DO NOT SPRAY ACID; DO NOT SPRAY ESTER AFTER FEB 20
41 Dicamba Salts and Relative Volatility Dicamba Acid Dicamba Na + or K + Dicamba DMA Dicamba DGA (Clarity) V O L A T I L I T Y Dicamba BAPMA (Engenia) = Xtendimax?
42 Only these two will be legal and labeled for in season over the top use on cotton: -Dicamba BAPMA (Engenia) = Xtendimax -2,4-D Choline (Enlist) That s it. No other formulation is labeled. No tank mixes labeled.
43
44 Bales in Georgia Lost to: Fusarium 2,300 Verticullium 0 Bacterial Blight 11,300 Seedling Diseases 22,000 Boll Rot 56,300 Nematodes 191,300 Root Knot 135,000 Almost 13% of yield is lost each year 290,300 bales total lost each year More focus here! 145 million pounds = $103,056,500 65% of the total bales lost in Georgia are from Nematodes
45 What are you spending most money on? Have you taken nematode samples? What is your rotation? Corn and Soybeans are susceptible to nematodes. Use nematicides or resistant cotton varieties?
46
47 2016 Variety Yield PHY DG ST ST ST PHY CG PHY DP DP DP NG PHY NG DG BX Appling County Variety Trial 2015
48 Replicating on farm research is important. You can see 1553 variety in the below trial varied 310 lbs. across the field with the same treatment. To know if a product truly works, you need multiple replications across a field. Rep 1 Rep 2 Rep 3 Variety Yield Variety Yield Variety Yield 1555 Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone Telone
49 What are people most interested in on the blog? Google appling farm news
50
51 Bales in Georgia Lost to: Fusarium 2,300 Verticullium 0 Bacterial Blight 11,300 Seedling Diseases 22,000 Boll Rot 56,300 Nematodes 191,300 Root Knot 135,000 Let s focus on where yield is being lost the most! Almost 13% of yield is lost each year 290,300 bales total lost each year More focus here! 145 million pounds = $103,056, million lbs. lost 65% of the total bales lost in Georgia are from Nematodes
52 - Variety selection - Weed Control - Fertility (N,P,K) & soil ph - Nematodes
2017 Cotton Weed Control and a few other things
2017 Cotton Weed Control and a few other things County Cotton Update Stanley Culpepper, University of Georgia, Tifton Registered Auxin Systems XtendiMax With Vapor Grip Engenia Enlist Duo (cotton, beans
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