Managing Glyphosate- Resistant Italian Ryegrass

Transcription

1 Managing Glyphosate- Resistant Italian Ryegrass Jason A. Bond Delta Research and Extension Center Stoneville, MS Phone: (662)

2 GR Italian Ryegrass Confirmed glyphosate-resistant Suspected glyphosate-resistant Bond et al. 2012

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6 Spring Programs Gramoxone Inteon or Select Max followed by Select Max Sequential Gramoxone Inteon at 4 PT/A Gramoxone Inteon at 4 PT/A applied after heading Source: R. C. Bond et al. 2008

7 Nontreated Command 2 PT/A Zidua 2.77 OZ/A Dual Mag PT/A Source: R. C. Bond et al. 2008

8 Current Research

9 Emergence Patterns GR Italian Ryegrass Emergence in Mississippi 250 Density (n no./m 2 ) (n=4) (n=36) (n=32)

10 Residual Herbicide Timing Control (% %) 100 GR Italian Ryegrass Control in Early-March and *Data pooled over three studies. f e e d e e f c d b c c d c d September October November Application timing d e a b a a b c a b Double disk Dual Mag PT Command-2 PT Treflan-3 PT Zidua-2.77 OZ

11 September October November Double disk Dual Magnum at 1.33 PT/A March 7, 2011

12 POST Control + Residuals Dual Magnum at 1.33 pt/a + Gramoxone Inteon at 3 pt/a

13 Early-spring Applications Control (% %) GR Italian Ryegrass Control on April 12, *Data pooled over two studies. j f g e f g h f g h g h i a b a November 5 January 13 March 1 e f e c d b c Application timing i b c a d e e d e c d Glyphosate Select Max-12 OZ Select Max-16 OZ Fusilade-12 OZ Fusilade-16 OZ Assure II-8 OZ Assure II-12 OZ

14 Alternative Herbicides GR Italian Ryegrass Control 28 DAT Rice Corn Graminicides Wheat Control (%) Gramoxone Inteon Glyphosate+Select Max Poast Plus Fusilade DX Assure II Select Max Beyond Newpath Facet Ricestar HT Clincher SF Grasp Regiment Achieve Atlantis Everest Hoelon Axial XL Osprey PowerFlex Option Capreno Steadfast Q Stout Resolve Q

15 Late-spring Applications Control (%) Gramoxone Inteon Tank-mixtures GR Italian Ryegrass Control 28 DAT *Data pooled over two studies. e c d d e b c Gramoxone Inteon 3 PT/A d e a b c a b a Gramoxone Inteon 4 PT/A No tank-mix Sencor-7 OZ Aatrex-1 QT Direx-1.6 PT

16 Fall-Spring Programs Control (%) GR Italian Ryegrass Control on March 24, *Data pooled over two studies. g c d e b No fall treatment No POST Gramoxone Inteon 4 PT/A; February f b d Double disk; November a b c a a a Dual Magnum 1.33 PT/A; November Select Max 16 OZ/A; January Select Max fb Gramoxone Inteon

17 No fall treatment No POST Select Max 16 OZ/A; Jan. Gramoxone Inteon 4 PT/A; Feb. Select Max fb Gramoxone Inteon March 24, 2011

18 Double disk; November No POST Select Max 16 OZ/A; Jan. Gramoxone Inteon 4 PT/A; Feb. Select Max fb Gramoxone Inteon March 24, 2011

19 Dual Magnum at 1.33 PT/A; November No POST Select Max 16 OZ/A; Jan. Gramoxone Inteon 4 PT/A; Feb. Select Max fb Gramoxone Inteon March 24, 2011

20 GR Italian Ryegrass Crop Fall Winter Spring Corn Dual Mag. at 1.33 pt/a or double disk Select Max at 12 to 16 oz/a or equivalent of 2-lb clethodim 1 or 2 applications of paraquat at 0.75 to 1 lb ai/a Cotton Dual Mag. at 1.33 pt/a, Treflan at 3 pt/a, double disk Select Max at 12 to 16 oz/a or equivalent rate of 2-lb clethodim 1 or 2 applications of paraquat at 0.75 to 1 lb ai/a Soybean Dual Mag. at 1.33 Select Max at 12 to 1 or 2 applications of pt/a,treflan at 3 16 oz/a or equivalent paraquat at pt/a, Boundary at 2 rate of 2-lb clethodim 0.75 to 1 lb ai/a pt/a or double disk Rice Command at 2 pt/a or double disk Select Max at 12 to 16 oz/a or equivalent rate of 2-lb clethodim 1 or 2 applications of paraquat at 0.75 to 1 lb ai/a

21 $28/A $44/A No fall program fb Select Max fb Gramoxone Inteon $32/A Double disk in fall Select Max fb Gramoxone Inteon $28/A Dual Mag. in fall fb Gramoxone Inteon; Feb. Dual Mag. in fall fb Select Max; Jan. March 24, 2011

22 Italian Ryegrass in Corn Source: T.W. Eubank Source: T.W. Eubank Source: Erick Larson

23 Ryegrass No ryegrass Source: Erick Larson, MSU Corn Verification Program

24 Misery Loves Company Source: T.W. Eubank

25 Can We Get Ahead? Road ditch treated with Select Max in No treatment in Property line Source: Joe Townsend

26 Other Things to Consider Spring tillage will require multiple passes due to root volume of Italian ryegrass Spot treatments can be effective Target 100% control prior to planting Budget for minimum two burndown treatments Avoid multiple applications of clethodim Italian ryegrass in Mississippi is resistant to ACCase (Hoelon) and ALS herbicides (Steadfast, Accent, etc.) Italian ryegrass in western U.S. is resistant to chloracetamides (Dual Magnum family)

27 Questions? Jason A. Bond Delta Research and Extension Center Stoneville, MS Phone: (662)

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