Skip to content

Northwest Iowa Dairy Outlooks

A local discussion of current science and issues concerning dairying in northwest iowa

Hot, dry conditions may lead to a shortage of grass and hay for livestock. Small grain crops are an alternative source of feed for livestock when other feed sources are limited, but previous herbicide usage may influence using small grain crops as livestock feed.

Richard Zollinger, Weed Specialist with North Dakota State Extension notes most herbicides have grazing and feeding restrictions stated on the label that limit the use of the crop for livestock feed. However, the labels are often vague regarding specific information on use of grain crops as forage for livestock, since this is not the normal use.

Grazing and harvesting a crop for feed following herbicide use often is prohibited because research on residue levels in the crop is inadequate. The effect of the chemical or its breakdown products on livestock or retention in the animal’s body may not be known. Livestock which consume crops treated with such herbicides probably would not become ill from the chemicals, but could retain the chemicals in their systems. The concern is that herbicides could be passed in the milk of lactating animals or cause abortion in pregnant animals. The chemical may also have potential to be retained by the animals and be present in the slaughtered carcass. Although these problems are not likely to occur, labeling restrictions are strict and should be adhered to. The presence of foreign chemicals in milk or meat of animals can result in confiscation and destruction of the products and loss of income from these animals.

The following table presents some of the grazing and feeding restrictions for herbicides commonly used on small grain crops. The herbicide label is always the final authority on herbicide uses and precautions. Information on the toxic effects of herbicides on animals is not readily available.

Herbicide Crop Time interval
DAA = days after application            WAA = Weeks after appl.
Accent Corn 30 DAA
Acetochlor Corn No restriction
Achieve Small grain 30 DAA
Aim Corn, small grain No restriction
Amber CRP, small grain No restriction
Assert Sunflower, small grain Not allowed
Assure II Canola/mustards, chickpea, dry bean, dry pea, lentil, soybean, sugarbeet Not allowed
Atrazine Corn 21 DAA
Authority Assist Soybean Not allowed
Authority First Soybean Not allowed
Authority MTZ Soybean Not allowed
Axial XL Barley

Wheat

Not allowed

50 DAA

Balance Pro Corn No restriction
Basagran Corn

Dry edible bean, dry pea

Soybean

12 DAA

No restriction

30 DAA

Basis Corn 30 DAA
Beyond Clearfield canola, CF wheat

Clearfield sunflower

No restriction

Not allowed

Bromoxynil Alfalfa

Corn, small grain

CRP, Grass establishment

Flax

30 DAA

45 DAA

Not allowed

No restriction

Bromox&MCPA Small grain 45 DAA
Callisto Corn 45 DAA
Camix Corn 45 DAA
Celebrity Plus Corn 32 DAA
Chlorsulfuron Small grain No restriction
Chlor&Metslfrn Small grain No restriction
ClearMax Clearfield wheat 7 DAA
Clethodim Alfalfa

Canola, chickpea, dry bean, flax, potato, soybean, sunflower, sugarbeet

15 DAA

Not allowed

Clopyralid Canola/mustards, sugarbeet 7 DAA
Clopyralid& 2,4-D/MCPA CRP, small grain – graze/feed

– hay

7 DAA

Not allowed

Dicamba Corn

CRP – non-lactating animals

   – lactating – see label

Small grain – non-lactating

  – lactating – see label

  – haying forage

> milk stage

No restriction

< 70 DAA

No restriction

7 DAA

37 DAA

Discover Small grain 30 DAA
Distinct Corn 32 DAA
Eptam Alfalfa, sunflower No restriction
Everest Small grain 60 DAA
Extreme RUR soybean Not allowed
Far-Go Chickpea, small grain

Field pea

Lentil

Not allowed

120 DAA

No restriction

Finesse Small grain No restriction
FirstRate Soybean 14 DAA
Flexstar Soybean Not allowed
Fusilade DX Soybean Not allowed
Fusion Soybean Not allowed
Gangster Soybean Not allowed
Glyphosate labels indicate that for all registered crops and applications unless otherwise noted there is an 8 week after application (WAA) restriction for grazing, feeding and haying.
Glyphosate Alfalfa – Preharvest

Spot – Monsanto

 – Generics

Renovate – < 1.5 lb ae/A

  – > 1.5 lb ae/A

Renovation – Generics

Alfalfa – Roundup Ready

Barley – Preharvest

Postharvest – Monsanto

     – Generics

Canola

Canola – RR

Chickpea – Preharvest

Corn – Preharvest

Postharvest – Monsanto

      – Generics

Corn RUR – Preharvest

Postharvest

Dry bean – Preharvest

Dry pea – Preharvest

Flax

Lentil

Potato – Preharvest

Soybean – Preharvest

Monsanto – < 22 fl oz/A

  – > 22 fl oz/A

Generics – < 6 qt/A

Postharvest

Soybean – RR – Preharvest

Monsanto –

Generics –

Postharvest

Sugarbeet

Sunflower

Wheat – preharvest

Postharvest – Monsanto

      – Generics

1.5 DAA

3 DAA

14 DAA

3 DAA

Not allowed

8 WAA

5 DAA

After harvest

7 DAA

8 WAA

Not allowed

8 WAA

8 WAA

8 WAA

7 DAA

8 WAA

7 DAA

7 DAA

Not allowed

8 WAA

8 WAA

8 WAA

8 WAA

14 DAA

25 DAA

25 DAA

8 WAA

14 DAA

Not allowed

8 WAA

8 WAA

Not allowed

After harvest

7 DAA

8 WAA

Halex GT Corn 45 DAA
Hornet Corn No restriction
Huskie Wheat, barley 25 DAA
Impact Corn 45 DAA
Laudis Corn 45 DAA
Liberty Liberty Link canola or corn Not allowed
Lightning Clearfield corn 45 DAA
Lumax Corn 45 DAA
Maverick Small grain  – Feed, graze

– Hay

No restriction

30 DAA

MCPA CRP, small grain – hay

   – graze dairy animal

   – graze meat animal

Flax, grass establishment

30 DAA

7 DAA

7 DAA

7 DAA

Metolachlor Chickpea, soybean

Corn

Dry bean, field pea

Potato, safflower, sunflower

No restriction

30 DAA

120 DAA

Not allowed

Metribuzin Field pea, lentil, soybean 40 DAA
Metsulfuron CRP

Small grain

No restriction

No restriction

Met & Chlorsfrn Small grain Not allowed
NorthStar Corn 30 DAA
Olympus Small grain No restriction
Option Corn 45 DAA
Outlook Corn

Soybean

45 DAA

Not allowed

Paramount CRP

Small grain

309 DAA

Not allowed

Paraquat (PRE) Corn, dry bean, field pea

sunflower (desiccant),

small grain

7 DAA
Peak Small grain 30 DAA
Permit Corn 30 DAA
Plateau CRP

Grass establishment

No restriction

Not allowed

Poast Alfalfa

Canola, dry bean, dry pea, flax, lentil, flax, potato, sunflower sugarbeet

Soybean

7 DAA

No restriction

Not allowed

Prowl Wheat

Corn

Soybean

Chickpea, dry bean, dry pea, lentil, potato, sunflower

28 DAA

21 DAA

No restriction

Not allowed

Puma Small grain No restriction
Pursuit Alfalfa

Chickpea, soybean

Dry edible bean

Field pea

Lentil

30 DAA

Not allowed

7 DAA

120 DAA

No restriction

Pursuit Plus Soybean Not allowed
Python Corn

Soybean

No restriction

Not allowed

Rage D-Tech Corn and grass forage

Small grains

7 DAA

14 DAA

Raptor Alfalfa, dry bean, field pea, soybean No restriction
Reflex Dry edible bean 7 DAA
Rezult Soybean

Dry bean, dry pea

Not allowed

No restriction

Rimfire Wheat 30 DAA
Rimsulfuron Corn

Potato

30 DAA

Not allowed

Sequence Pod crops

Soybean

120 DAA

30 DAA

Silverado Wheat/Durum – hay

     forage

     grain straw

50 DAA

30 DAA

55 DAA

Sonalan Canola/mustard, dry bean

soybean, sunflower

Field pea

Not allowed

No restriction

Sonic Soybean Not allowed
Spartan Dry pea, chickpea, soybean

sunflower

No restriction
Starane Corn

Small grain – graze/feed

– hay

47 DAA

7 DAA

14 DAA

Starane NXT Small grain 45 DAA
Status Corn 32 DAA
Steadfast Corn 30 DAA
Thistrol Field pea Not allowed
Thifensulfuron Soybean, small grain Not allowed
Thifn&Tribenrn Small grain Not allowed
Tribenuron Small grain Not allowed
Trifluralin Canola/mustard, dry bean pea, lentil, potato, safflower, sunflower, sugarbeet

Chickpea, flax, soybean,

small grain

Not allowed

No restriction

Ultra Blazer Soybean Not allowed
Valor Soybean Not allowed
WideMatch Corn

Small grain – graze/forage

– hay

47 DAA

7 DAA

14 DAA

2,4-D CRP, grass  – hay

– graze/feed dairy animal

– graze/feed meat animal

Small grain

 – graze/feed/hay dairy animal

 – graze/feed/hay meat animal

30 DAA

7 DAA

3 DAA

14 DAA

No restriction

2,4-DB Alfalfa

Soybean

30 DAA

60 DAA

Grazing and Haying Restrictions for Herbicides Used in Pasture and Rangeland

 Herbicide1     Lactating dairy animals       All animals except lactating dairy animals
Before

grazing

Before

hay harvest

Before

grazing

Before

hay harvest

Removal before

slaughter

            days after application days after application
Cimarron/Extra   0   0   0   0   0
Cimarron Max/Extra   7   –   0   0 30
Amber   0 30   0 30   0
Clopyralid   0   0   0   0   0
Clopyralid + 2,4-D 14 30   0 30   73
Crossbow 1 year 1 year   02   1 year   3
Dicamba1

          Up to 1 pt

          Up to 2 pt

          Up to 4 pt

          Up to 16 pt

  7

21

40

60

37

51

70

90

  0

  0

  0

  0

  0

  0

  0

  0

30

30

30

30

FallowMaster   8 weeks   8 weeks   8 weeks   8 weeks   8 weeks
Fuego   7 30   0 30 30
Glyphosate1

Pre/Renovation – < 1.5 lb ae/A

 – > 1.5 lb ae/A

          Spot Spray – Monsanto6

                   – Generics

          Broadcast

No restriction 

  8 weeks

  7

14

  8 weeks

No restriction

  8 weeks

  7

14

  8 weeks

No restriction

  8 weeks

  7

14

  8 weeks

No restriction

  8 weeks

  7

14

  8 weeks

No restriction

  8 weeks

  7

14

 8 weeks

Glyphosate + 2,4-D premix5   7 30   3 30   3
Grazone P + D   7 30   7 30   3
Metsulfuron   0   0   0   0   0
Milestone   0   0   0   0   0
Paramount No grazing allowed. Do not hay for 309 days after application.
Paraquat4   1 month   1 month   1 month   1 month   0
Plateau   0   7   0   7   0
Rave   7   0   0   0   0
Redeem   1 year   1 year   0   1 year   3
Spike7   0   1 year   0   1 year   0
Tordon 22K8 14 14   0 14   3
2,4-D/MCPA1   7 30   0 30   3

1 Check individual product labels containing the same active ingredients for restrictions and use rates.

2 One year if more than 1.5 gallons/A is used.

3 Withdrawal not needed if 2 weeks or more time elapsed since application.

4 Restrictions based on degree of new seedling establishment before grazing. Suggested at least 6 inches of grass or legume growth.

5 No restrictions if 10% or less of the area is treated.

6 Do not treat more than one-tenth of any given acre at one time with spot or wiper applications. Remove livestock before application.

7 If no more than 20 lb/A used.                                                              

8 Remove livestock to untreated grass pasture for 7 days before transferring livestock to broadleaf or pasture areas. Removal before slaughter statement only applies to animals grazing treated forage for 2 weeks immediately after application.

Advertisements

Tags: , , ,

%d bloggers like this: