Right of Way Herbicides: Grazing, Haying and Manure

MN PIE Recertification Training
Prepared by
Louanne Brooks
Dow AgroSciences
 This presentation is not intended to be a complete
review of all herbicide products labeled for rights of
way use. Always read and follow all label instructions.
DMA4 herbicides are registered trademarks of Dow
AgroSciences LLC.
KRENITE herbicides are registered trademarks of
 ARSENAL, HABITAT herbicides are registered
trademarks of BASF Corporation.
 Right of Way (ROW) Herbicides are used on sites such
as roadsides, power line rights of way, railroads and
pipelines to control vegetation which can interfere
with the purpose of the right of way.
 Target species include woody and herbaceous plants.
 Treatments include broadcast and spot applications
for either bareground or selective broadleaf control.
 Some of ROW products are also marketed for
agricultural uses; some are strictly non-crop.
 Product labels and MSDS can be found at:
Herbicides intended for use on rights of way should be
labeled for non-crop and/or rights of way.
In order for a product to be used where livestock graze, or
on feed for livestock, the active ingredient must pass a
series of residue tolerance tests as required by FIFRA.
Therefore, some ROW products allow haying, grazing or
use on feed crops; some do not. Label language varies.
Read labels thoroughly to understand how to use the
product when livestock may consume treated vegetation.
 Most ROW herbicides either allow or prohibit grazing
and haying.
 Occasionally an older product may have no label
language regarding haying and grazing.
 The label statements for both activities usually appear
close together on the label.
 There may be multiple statements regarding grazing
and haying, at more than one location, on the label.
 Not all products labeled for use in rights of way allow
haying or grazing following application. Products that
prohibit livestock consumption include:
 Viewpoint
 Perspective
 Streamline
 Krenite:
DuPont has developed and submitted data to EPA to
allow use of these products for haying and grazing
with the anticipation of labeling late in 2013.
 Opensight
 Garlon
 Tordon
 Rodeo
 Milestone
 Escort XP
 Transline
 2,4-D
 Habitat
 Arsenal
 Escort XP
Follow the
directions for
Pasture and
Rangeland when
treating grazed
areas on ROW
Animals can
after spot
Do not cut hay
for 7 days after
spot treatments
This is referred to
as the “PHI” or preharvest interval
 Garlon: current restrictions for lactating animals are
based on a LACK of residue testing . Residue testing
has now been completed and results accepted by EPA
for review. It is anticipated that the restrictions for
lactating dairy animals will be lifted sometime soon.
 Some products may have other guidelines relating to
grazing or feeding treated forage. Examples from
Tordon K:
 Most products labeled for haying have a “PHI” (Pre-
Harvest Interval). The PHI is the length of time that
must elapse after spraying before hay can be cut.
 PHI may be based on the amount of time needed for
the herbicide to act in the target, and/or the need for
herbicide residue degradation.
 Remember, not all products labeled for ROW allow
14 days
14 days
14 days
14 days
Arsenal (spot treatment)
7 days
7 days
7 days
36 hours
No PHI restriction
 The label makes no mention one way or another about
haying or grazing (does not permit or prohibit).
2,4-D has tolerances for grazing and haying, which is
listed in the RED (EPA’s Reregistration Eligibility
The RED restriction that pertains to haying is a 7 day
PHI (pre-harvest interval) of 7 days.
Many range and Pasture products contain 2,4-D.
Dow AgroSciences is in the process of adding Range and
Pasture uses to DMA4 IVM.
According to MN DOAg, as the label now stands, it
would be difficult to regulate someone cutting roadside
hay, who observes a PHI of 7 days.
 Picloram
 Clopyralid
 Aminopyralid
 Milestone, Opensight
 Aminocyclopyrachlor
 Streamline, Perspective,
 Imazapyr
 Arsenal, Habitat,
 Exercise care when spraying around sensitive crops:
 Avoid drift onto sensitive crops by using large-droplet
nozzles and drift control additives
 Avoid applications where rainwater runoff drains into
sensitive crops
 Do not use clippings from treated vegetation for mulch
or compost
 When livestock consume treated pasture or hay that
contains herbicide residue, what happens to the
 It passes through the animal unchanged: it is not
generally metabolized or retained in the body.
 Residues may be excreted in urine, manure or milk.
 Residues are broken down by micro-organisms in the
 In cold temperatures, half life is prolonged because
micro-organism activity is retarded.
 Hay made from grass treated with a residual herbicide
should be used on farm, unless labeling allows
 Follow label guidelines for moving animals from
treated pasture to sites where broadleaf crops may be
planted in the near future.
 Handle manure from animals eating hay or pasture
treated with residual herbicides in accordance with
label guidelines.
 Refer to the product label for sites where manure may
be spread: sites vary by product.
 Some right of way herbicides allow grazing and
haying; some prohibit it.
 Product uses and restrictions regarding grazing and
haying vary: read each product label carefully (rates,
PHI, livestock withdrawal, etc).
 Many ROW herbicides are residual products: follow
label instructions for grazing, haying, composting,
mulching and manure management.
 Proper use protects these tools for the future.

similar documents