Glyphosate Resistant Palmer amaranth response to weed management programs in Roundup Ready and Liberty Link cotton. Culpepper, York, Kichler, MacRae

Transcription

1 Glyphoste Resistnt Plmer mrnth response to weed mngement progrms in Roundup Redy nd Liberty Link cotton Culpepper, York, Kichler, McRe

2 Glyphoste resistnt Plmer Amrnth Confirmed

3 Georgi counties smpled for glyphosteresistnt Plmer mrnth (more sites being tested) Confirmed in 83 of 149 fields smpled

4 WetherMx 88 oz t 1 inch WetherMx 88 oz t 4 inch WetherMx 88 oz t 12 inch

5 Objective Determine if bsed progrms were more effective thn Roundup bsed progrms in mnging glyphosteresistnt Plmer mrnth in DRYLAND cotton production

6 27 Experiment Loction: 2 Studies in Mcon County

7 Greter thn 98% of popultion is resistnt WetherMx 66 oz/a WetherMx 264 oz/a Plmer less thn 2 when treted

8 Experiment 1: LL vs RR Systems Plot size: 2 rows by 3 feet Split Plot/Fctoril Design 2 technologies 6 herbicide systems 2 tillge prctices

9 DP 555 BRR RR Herbicide Systems* PRE Prowl H 2 or Prowl H 2 + Reflex POT 1 WMx WMx + Dul Mg. WMx + Stple POT 2 WMx WMx WMx *Direx + MSMA pplied t lyby for ech herbicide progrm. Non treted control included. Prowl = 2 pt/a; Reflex = 1 pt/a; WMx = 22 oz/a; Dul Mgnum = 1 pt/a; Stple LX = 1.7 fl oz/a

10 FM 1735 LLB2 LL Herbicide Systems* PRE Prowl H 2 or Prowl H 2 + Reflex POT 1 + Dul Mg. + Stple POT 2 *Direx + MSMA pplied t lyby for ech herbicide progrm. Non treted control included. Prowl = 2 pt/a; Reflex = 1 pt/a; = 23 oz/a; Dul Mgnum = 1 pt/a; Stple LX = 1.7 fl oz/a

11 Cultivted 1 d fter POT 1 nd POT 2 Applictions

12 Weed nd Cotton Size PRE: no rin for 17 dys POST 1: 1 lf cotton, 2 4 inch Plmer no rin for 21 d POST 2: 6 lf cotton, 2 inch Plmer (new flush)

13 Percent glyphoste resistnt Plmer mrnth control t hrvest. Mcon Co., GA. 27.* POT1 c c + Dul 3 b + Stple + Dul + Stple POT2 Prowl PRE Direx + MSMA directed over entire tril re.

14 WetherMx 22 oz + Stple LX 2.5 oz/a + NIS 35 DAT, 2 when treted

15 WetherMx 44 oz + Stple LX 5. oz/a + NIS 35 DAT, 2 when treted

16 WetherMx 88 oz + Stple LX 1. oz/a + NIS 35 DAT, 2 when treted

17 WetherMx 176 oz + Stple LX 15. oz/a + NIS 35 DAT, 2 when treted

18 Percent glyphoste resistnt Plmer mrnth control t hrvest. Mcon Co., GA. 27.* * * * POT1 c c + Dul * 3 b + Stple + Dul + Stple POT2 Prowl + Reflex Direx + MSMA directed over entire tril re. * denotes improved control by dding Reflex.

19 Percent glyphoste resistnt Plmer mrnth control t hrvest. Mcon Co., GA. 27.* * * * * POT1 c c + Dul 3 b + Stple + Dul + Stple POT2 Prowl + Cultivtion Direx + MSMA directed over entire tril re. * denotes improved control by dding Reflex.

20 Prowl + Reflex PRE nd Glyphoste POST. Rinfll 17 d fter PRE No Cultivtion Cultivtion

21 Prowl + Reflex PRE nd POST. Rinfll 17 d fter PRE No Cultivtion Cultivtion

22 Prowl + Reflex PRE; WMx or + Stple POST 1; WMAX or POST 2; Direx + MSMA Lyby WMAX system System

23 Percent glyphoste resistnt Plmer mrnth control t hrvest. Mcon Co., GA. 27.* * * * * c * c + Dul 3 b + Stple + Dul + Stple Prowl + Reflex + Cultivtion Direx + MSMA directed over entire tril re. * denotes improved control by dding Reflex.

24 Seed cotton yield in RR nd LL weed mngement progrms. Mcon Co., GA. 27.* b b + Dul b + Stple + Dul + Stple Prowl Direx + MSMA directed over entire tril re.

25 Seed cotton yield in RR nd LL weed mngement progrms. Mcon Co., GA. 27.* Dul + Stple + Dul + Stple Prowl + Cultivtion Direx + MSMA directed over entire tril re. * denotes improved control by dding Reflex.

26 Exp 2: Evluting lrge scle bsed progrms Plot size: 12 rows by 12 feet; 4 reps Tretments PRE None Reflex Direx + Reflex POT1 POT2 Lyby Pro + MSMA directed over entire tril re.

27 Glyphoste resistnt Plmer Amrnth Infesting RR Cotton 26 Glyphoste bsed progrm in drylnd production

28 Percent glyphoste resistnt Plmer mrnth control t mid seson. Mcon Co., GA. 27.* b 2 None Reflex Direx + Reflex POT 1

29 Percent glyphoste resistnt Plmer mrnth control t mid seson. Mcon Co., GA. 27.* b None Reflex Direx + Reflex POT 1 nd POT 2 Lyby Pro + MSMA directed

30 Glyphoste resistnt Plmer Amrnth 27 bsed progrm in drylnd production Non treted Direx + Reflex PRE 2 POST 1 2 POST 2 LybyPro + MSMA lyby

31 Conclusions 1. Morningglory controlled > 98% by ll progrms in both experiments. 2. Greter control of glyphoste resistnt Plmer mrnth ws noted with bsed progrms. Limittions to LL system doption: Cultivr Selection Sprying Plmer 2 inch or less

32 Conclusions 3. Cultivtion importnt for RR & LL progrms. 4. LL progrms with cultivtion provided gretest control, nd gretest yields. 5. DP 555 BR tillge, new herbicide chemistry, or the bility to mnge wter With 555 BR being removed from the mrket plce fter 29.cotton tolernt to looks very promising!

33 Comments? Efforts supported by GA Cotton Commission, Cotton Incorported, Cotton Foundtion, nd Industry