Sunflower Weed Control Update and Issues. Rich Zollinger NDSU Extension Weed Specialist
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1 Sunflower Weed Control Update and Issues Rich Zollinger NDSU Extension Weed Specialist
2 2013 NSA Research Forum 1.Brief overview of herbicide resistant weeds 2.Clearfield Plus sunflower 3.IR-4 pyroxasulfone/snfl registration 4.Results of regional pyroxasulfone Round Robin study (NSA funded)
3 Kansas, 2011 first state to confirm five species resistant to glyphosate Kansas Glyphosate R Weeds: 1. Common ragweed 2. Giant ragweed 3. Marestail (horseweed). 4. Waterhemp 5. Kochia
4 Areas and counties of ND and MN having confirmed and suspected glyphosate-resistant weeds 2007 Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp Provided by: Drs. Jeff Stachler, Jeff Gunsolus, Mike Christoffers, and Kirk Howatt Black symbols: confirmed resistant cases; Blue: highly suspected
5 Areas and counties of ND and MN having confirmed and suspected glyphosate-resistant weeds 5 to 50% soybean fields gly-r C. Rag. 5 to 95% all fields gly-r waterhemp to 95% all fields gly-r C. Rag. 70 to 95% all fields have gly-r waterhemp 60 to 95% all fields have gly-r G. Rag. Gly-R horseweed / marestail Gly-R kochia Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp Provided by: Drs. Jeff Stachler, Jeff Gunsolus, Mike Christoffers, and Kirk Howatt 30 to 60% all fields gly-r C. Rag. 5 to 95% all fields gly-r G. Rag. & waterhemp Black symbols: confirmed resistant cases; Blue: highly suspected
6 Areas and counties of ND and MN having confirmed and suspected glyphosate-resistant weeds 5 to 50% soybean fields gly-r C. Rag. 5 to 95% all fields gly-r waterhemp to 95% all fields gly-r C. Rag. 5 to 60% all fields have gly-r kochia 70 to 95% all fields have gly-r waterhemp 60 to 95% all fields have gly-r G. Rag. Gly-R horseweed / marestail Gly-R kochia Gly-R common ragweed Gly-R giant ragweed Gly-R waterhemp Provided by: Drs. Jeff Stachler, Jeff Gunsolus, Mike Christoffers, and Kirk Howatt 30 to 60% all fields gly-r C. Rag. 5 to 95% all fields gly-r G. Rag. & waterhemp Black symbols: confirmed resistant cases; Blue: highly suspected
7 Areas and counties of ND and MN having confirmed and suspected glyphosate-resistant weeds to 60% all fields have gly-r kochia Gly-R kochia Provided by: Drs. Jeff Stachler, Jeff Gunsolus, Mike Christoffers, and Kirk Howatt Black symbols: confirmed resistant cases; Blue: highly suspected
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9 Result Individual prescription weed control! 1.5 hour office visits to develop weed management strategies
10 Clearfield Plus sunflower
11 Pyroxasulfone (Kumiai) How is pyroxasulfone different than other acetanilide herbicides (Dual, Outlook)? 1.Active ingredient owned by Kumiai 2.Kumiai allow marketing to BASF = Zidua (pyroxasulfone) Valent = Fierce (pyroxasulfone + Valor) FMC = Anthem (pyroxasulfone + Cadet)
12 NSA Research Summary KIH-485/pyroxasulfone NSA Research Timeline: researchers saw selectivity 2006 NSA funded standard protocol 2007 Study repeated for validation 2008 KIH Spartan
13 Weed Control Summary Weeds controlled (80-99%): Grasses foxtail crabgrass wild oat Jap. brome Downy brome pigweed lambsquarters kochia nightshade buckwheat Broadleaf weeds pigweed/amaranth velvetleaf puncture vine Russian thistle c. ragweed marshelder prostrate spurge
14 Pyroxasulfone Snfl Registration Timeline made to Kumiai: Product: Pyroxasulfone 2008 Apply for ND Minor Use Funds 2009 IR-4 4 residue trials Possible Section Section 18 or Section 3
15 Pyroxasulfone Snfl Registration Dec 2011 Jan IR-4 bid for Approved by Kumiai Apply ND Minor Use Funds pyrox/snfl registration = $172k 4 bid for pyrox/snfl - Requested ~100k from NDDOA - Request rejected: No matching funds
16 Pyroxasulfone Snfl Registration Sept A ranking IR-4 4 Food Use Wrkshp John Sandbakken walks on water IR-4 4 bid $175,000 Matching funds: Kumiai = $ 45,000 Canada = $ 30,000 Total = $100,000 Requested: NDDOA = $ 50,000 IR-4 4 = $ 50,000
17 Pyroxasulfone Snfl Registration Sept A ranking IR-4 4 Food Use Wrkshp John Sandbakken walks on water IR-4 4 bid $175,000 Matching funds: Kumiai = $ 45,000 Canada = $ 30,000 Total = $100,000 Requested: NDDOA = $ 50,000 ($20,000) IR-4 4 = $ 50,000
18 Pyroxasulfone on Sunflower, 2011, Horace and Buffalo, ND NDSU graduate student: Justin Mack Treatments: Pyrox (PRE) fb Beyond 100, 200, 400 g/ha 4 fl oz/a Pyrox (PRE) fb Pyrox (POST) + Beyond , 400 g/ha 4 fl oz/a , 400 g/ha 4 fl oz/a 400 g/ha 100, 200, 400 g/ha 4 fl oz/a Results:
19 Pyroxasulfone on Sunflower, 2011, Horace and Buffalo, ND Treatments: Pyrox (PRE) fb Beyond 100, 200, 400 g/ha 4 fl oz/a Pyrox (PRE) fb Pyrox (POST) + Beyond , 400 g/ha 4 fl oz/a , 400 g/ha 4 fl oz/a 400 g/ha 100, 200, 400 g/ha 4 fl oz/a Results: Snfl injury All PRE = 0% PRE fb POST = 7 DAT 14 DAT 28 DAT 16 41% 0 5% 0% injury Plant height = N/A Delay flowering = N/A Yield = N/A
20 2012 NSA Funded Research Regional Sunflower Herbicide Study Mike Moechnig Curtis Thompson Phil Stahlman Brian Jenks Rich Zollinger SDSU, Brookings, SD KSU, Garden City, KS KSU, Hayes, KS NDSU, Minot, ND NDSU, Fargo
21 Sunflower injury - Valley City, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 2-leaf 2 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Zollinger, % sunflower injury
22 Sunflower injury - Valley City, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 6-leaf 6 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Zollinger, % sunflower injury
23 Sunflower injury - Valley City, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 10-leaf stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Zollinger, % sunflower injury
24 Sunflower injury Minot, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 2-leaf 2 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Jenks, % sunflower injury
25 Sunflower injury Minot, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 6-leaf 6 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Jenks, % sunflower injury
26 Sunflower injury Minot, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 10-leaf stage Early Mid Late No differences in yield, ht, or test weight. Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Jenks, % sunflower injury
27 Sunflower injury Brookings, SD Applied at 2-leaf 2 stage Beyond 4 fl oz Zidua 2.5 oz Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Moechnig,, 2012 % sunflower injury
28 Sunflower injury Brookings, SD Beyond 4 fl oz Zidua 2.5 oz Applied at 6-6 and 10-leaf stage Early Mid Late No differences in yield, ht, or test weight. Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Moechnig,, % sunflower injury
29 Sunflower injury Manhattan, KS Beyond 4 fl oz Zidua 2.5 oz Ave of 2-, 2, 6-, 6, and 10-leaf stage Early Mid Late No differences in yield, ht, or test weight. Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Thompson, % sunflower injury
30 Sunflower injury - Valley City, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 6-leaf 6 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Zollinger, % sunflower injury
31 Sunflower injury - Valley City, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 6-leaf 6 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Zollinger, % sunflower injury
32 Sunflower injury Minot, ND Beyond 4 fl oz Zidua 2.5 oz Applied at 6-leaf 6 stage Early Mid Late Evaluation timing Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Jenks, % sunflower injury
33 Sunflower injury Manhattan, KS Beyond 4 fl oz Zidua 2.5 oz Ave of 2-, 2, 6-, 6, and 10-leaf stage Early Mid Late No differences in yield, ht, or test weight. Zidua 5 oz B+Z+NIS 2.5 oz B+Z+NIS 5 oz B+Z+MSO 2.5 oz B+Z+MSO 5 oz Thompson, % sunflower injury
34 2013 NSA Research Forum 1. Brief overview of herbicide resistant weeds 1. Clearfield Plus sunflower 2. IR-4 pyroxasulfone/snfl registration 3. Results of regional pyroxasulfone Round Robin study (NSA funded)
35 Not actual size
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