Weed Resistant Statistics
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1 Weed Resistant 2014
2 Weed Resistant Statistics 1 st resistance in 1970 in Washington to Triazine chemistry 143 different weed species resistant in U.S. (Beyond the Bean Feb. 14) 65 million acres are effected by resistant weeds in U.S. (Farm Journal Feb. 14) As much as 80% of Soybeans and cotton was weeded in Arkansas in 2012 (Midwest Producer July 12) Some fields disked under!
3 Glyphosate Introduced in mid 1970 s Primarily used as a burn down Introduction of RR soybeans in 1996 RR Corn 1998 RR Sugarbeets 2008 Controls the widest spectrum of weeds in cropping season Most widely used herbicide today
4 Understanding Resistance Tolerance Yellow nutsedge and wild buckwheat are 2 examples of naturally tolerant to glyphosate Labeled rates of glyphosate are less effective Nonperformance Incorrect rate for weed size Rain before completely absorbed Incomplete spray coverage below canopy Reduced glyphosate activity from low temperatures Dust from sprayer Proper adjuvant and AMS rate
5 Understanding Resistance Slight Injury Seriously Injured No Injury Resistant Moderate Injury Dead
6
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8 2013 Weed Resistance Map
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11 RR Corn Options
12 RR Soybean Options
13 Waterhemp Resistance Resistant to multiple Site of Action Site 2 ALS Inhibitors (Harmony, Raptor) Site 4 Growth Regulators (Clarity) Site 5 Photosystem II Inhibitors (Atrazine) Site 9 EPSP Synthase Inhibitors (Glyphosate) Site 14 PPO Inhibitors (Flexstar) Site 27 HPPD Inhibitors (Huskie)
14 Resistant Waterhemp Management in Sugarbeet PPI/PRE Nortron (8) (2 to 5 pt/a) + Dual (15) (.5 to 1 pt/a) or Nortron (8) (6 to 7.5 pt/a) Need to sign an Indemnified Label for PPI/PRE Dual 1 st Post cotyledon sugarbeets Roundup (9) (28 to 32 oz/a) + Betamix (5) (12 oz/a) + Nortron (8) (4 oz/a) + HSMOC (1 pt/a) + AMS (1 #/a) 2 nd Post 10 to 14 DAT Roundup (9) (24 to 28 oz/a) + Betamix (5) (16 oz/a if 4 lf sgbt) + Nortron (8) (4 oz/a) + Outlook (15) (14 to 21 oz/a) or Dual (15) (1 pt/a) + HSMOC (1 pt/a) + AMS (1 #/a)
15 Resistant Waterhemp Management in Sugarbeet 3 rd Post 8 leaf sugarbeet Roundup (22 oz/a) + Betamix (24 oz/a) + Nortron (4 oz/a) + Outlook (0 to 10 oz/a) or Dual (0 to 1 pt/a) + HSMOC (1 pt/a) + AMS (1 #/a) 90 day PHI for Nortron & max annual use 1 gal/a 4 th Post 10 to 21 DAT (If needed) Roundup (22 oz/a) + Betamix (32 to 48 oz/a) + AMS (1 #/a) 75 day PHI for Betamix
16 Kochia Resistance Resistant to multiple Site of Action Site 2 ALS Inhibitors (Harmony, Raptor) Site 4 Growth Regulators (Clarity) Site 5 Photosystem II Inhibitors (Atrazine) Site 9 EPSP Synthase Inhibitors (Glyphosate)
17 Resistant Kochia Management in Sugarbeet PPI/PRE Nortron (6 to 7.5 pt/a) 1 st Post 1 leaf kochia Roundup (28 to 32 oz/a) + Betamix (12 oz/a) + Nortron (4 oz/a) + HSMOC (1 pt/a) + AMS (1 #/a) 2 nd Post 10 to 14 DAT, 1 leaf kochia Roundup (24 to 28 oz/a) + Betamix (16 oz/a if 4 lf sgbt) + Nortron (4 oz/a) + HSMOC (1 pt/a) + AMS (1 #/a)
18 Resistant Kochia Management in Sugarbeet 3 rd Post 8 leaf sugarbeets Roundup (22 oz/a) + Betamix (24 oz/a) + Nortron (4 oz/a) + HSMOC (1 pt/a) + AMS (1 #/a) 90 day PHI for Nortron & max annual use 1 gal/a 4th Post 10 to 21 DAT (If needed) Roundup (22 oz/a) + Betamix (32 to 48 oz/a) + AMS (1 #/a) 75 day PHI for Betamix
19 Common Ragweed Resistance Resistant to multiple Site of Action Site 2 ALS Inhibitors (Harmony, Raptor) Site 5 Photosystem II Inhibitors (Atrazine) Site 9 EPSP Synthase Inhibitors (Glyphosate) Site 14 PPO Inhibitors (Flexstar)
20 Resistant Ragweed Management in Sugarbeet 1 st Post cotyledon sugarbeets Roundup (28 to 32 oz/a) + Stinger (3 to 4 oz/a) + AMS (1 #/a) 2nd Post 10 to 14 DAT Roundup (24 to 28 oz/a) + Stinger (3 to 4 oz/a) + AMS (1 #/a) 3rd Post 8 leaf sugarbeet Roundup (22 oz/a) + Stinger (3 to 4 oz/a) + AMS (1 #/a) 4th Post 10 to 21 DAT (If needed same as 3 rd ) 45 day PHI for Stinger Do not exceed 10.7 oz/a per season
21 Keys to Resistant Weed Control Use a PPI/PRE Spray small weeds (1 ) Use maximum glyphosate rates allowed Tank mix Manage sprays around weather/environment Scout fields 7 10 days after application Hand weed when necessary
22 Keys to Resistant Weed Control More chemistry class choices in rotational crops, use them Perimeter weed management Row crop cultivation only when needed Moldboard plow to bury weed seeds Do not allow weed seed production!
23 ACSC Chemical All retailer/distributors have availability to ACSC chemical Sugarbeet Mix (Generic Betamix) Phen Des 8+8 (Generic Betamix) B & B Plus (Generic Progress) Stored at AgDepot in Grand Forks No Deliveries Full Pallet Only (180 gals) No Returns
24 Any Questions? #2
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