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Post Grass Control in Soybeans
Assure II (quizalofop) at 7 to 10 fl oz/A plus petroleum oil adjuvant at 1% v/v applied POST controls annual grasses and quackgrass. See table in the soybean section for rates of Assure II according to weed species and weed size. Quackgrass regrowth should be retreated when 4 to 8 inches tall at 8 fl oz/A. Blazer, Basagran, Betanex, Betamix, Herbicide 273, or Cobra tank mixed with Assure II often reduce grass control compared to Assure II alone. Reduced grass control can be avoided by applying Assure II at least 1 day before or 5 days after application of a broadleaf herbicide. MSO type oils have performed equal to petroleum based oil additives with Assure II. Assure II may provide excellent green foxtail control but less yellow foxtail control. Lower yellow foxtail may result from applying Assure II at reduced rates, with broadleaf herbicides, or to large or stressed plants. Addition of fertilizer may enhance yellow foxtail control and control of stressed grasses.
Fusilade DX (fluazifop-P) at 5 to 12 fl oz/A plus oil additive at 1% v/v applied POST controls annual grasses and quackgrass. See table in the soybean section for information on the rate of Fusilade DX according to weed species and weed size. Fusilade DX provides quackgrass suppression with only one application. Quackgrass regrowth should be retreated at 3 to 5 leaves with Fusilade DX at 12 fl oz/A. Fusilade DX tank-mixed with other herbicides may provide less grass weed control or increase crop injury. Reduced grass control can be avoided by applying Fusilade DX at least 1 day before or 5 days after application of a broadleaf herbicide.
Poast (sethoxydim) is a 0.5 to 1.5 pt/A plus oil additive at 1 qt/A controls annual grasses in canola, crambe, rapeseed, dry bean, field pea, flax, lentil, lupin, potato, soybean, sugarbeet, and sunflower. MSO type oils (Scoil and Sun-It II, etc) and Dash additives have enhanced grass control with Poast more than petroleum oil or unmodified seed oil additives. See table in the soybean section for rates according to weed species and weed size. Poast provides only suppression of quackgrass. Quackgrass initially should be treated with 1.5 pt/A and regrowth 6 to 8 inches tall should be treated with 1 pt/A. Cultivation between 14 and 21 days after application will improve quackgrass control. Poast mixed with Betanex, Betamix, Herbicide 273, Blazer or Basagran reduces grass control compared to Poast with oil additive. Poast with oil additives frequently has increased crop injury when combined with Betanex, Betamix, Herbicide 273, Blazer or Cobra. Reduced grass control and crop injury can be avoided by applying Poast at least 1 day before or 5 days after application of a broadleaf herbicide. 28% UAN at 2 to 4 qt/A or 2.5 lb/A of AMS with the oil additive may increase control of volunteer corn, cereal grains and quackgrass.
Rezult (bentazon + sethoxydim) at 3.2 pt (1.6 pt/A Rezult G and 1.6 pt/A Rezult B)
applied
POST controls most grass and broadleaf weeds in soybean can be applied from emergence to
30 days prior to harvest. Add oil adjuvants at 1 to 2 pt/A. Refer to label or narrative
for tank-mix options. Rezult is priced economically compared to other POST herbicide
programs. Refer to Basagran and Poast sections for additional information.
Select (clethodim) at 4 to 16 fl oz/A or Prism at 8.5 to 34 fl oz/A plus oil additive at 1
qt/A
applied POST controls annual grass weeds and quackgrass. See table in the soybean section
for
rates of Select according to weed species and weed size. Quackgrass can be controlled with
sequential applications at 8 to 16 fl oz/A. Tank-mixing Blazer, Basagran, Cobra or Pursuit
with
Select may reduce grass control. Reduced grass control can be avoided by applying Select
at least 1 day before or 5 days after application of a broadleaf herbicide.
Select is a ACCase mode of action herbicide, similar to Assure II, fenoxaprop, Fusilade,
and Poast. However, research has shown that Select controls many grasses documented
resistant to other ACCase herbicides. No grass has been documented resistant to Select. It
is recommended that Select be used in rotation with herbicides of different modes of
action and in a resistant weed management program.
Fusion (fluazifop-P + fenoxaprop-P) at 4 to 12 fl oz/A plus 1% v/v crop oil control concentrate or 0.25% v/v NIS applied POST controls annual grasses and quackgrass in soybean. See table in the soybean section for information on the rate of Fusion according to weed species and weed size. Fusion provides in-season quackgrass control. Fusion is currently registered for tank-mix or sequential application with Blazer, Basagran, Blazer + Basagran, Pinnacle, Storm and Galaxy. Reduced grass control may occur with tank-mix combinations with broadleaf herbicides. However, reduced control can be avoided by applying Fusion 1 day prior to or 5 days after broadleaf herbicides. Fusion may be tank-mixed with Pursuit herbicide for control of volunteer corn only. Fusion may be tank-mixed with Orthene insecticide.
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