User manual

DuPont™ VELPAR® L herbicide is a water-dispersible
l
iquid that is mixed in water and applied as a spray for weed
control in certain crops, Christmas trees, forestry site
preparation and release areas, and industrial areas. It may
also be applied undiluted as a basal soil treatment for brush
control in reforestation areas, rangeland, pastures and
noncrop areas, or by stem injection for brush control.
VELPAR® L is an effective general herbicide providing
both contact and residual control of many annual, biennial
and perennial weeds and woody plants.
VELPAR® L is noncorrosive to equipment.
Care should be exercised when applying VELPAR® L near
desirable trees or shrubs as they can absorb
VELPAR® L through roots extending into treated areas.
This product may be applied on conifer plantations and non-
crop sites that contain areas of temporary surface water
caused by collection of water between planting beds, in
equipment ruts, or in other depressions created by
management activities. It is permissible to treat intermittent
drainage, intermittently flooded low lying sites, seasonally
dry flood plains and transitional areas between upland and
lowland sites when no water is present. It is also permissible
to treat marshes, swamps and bogs after water has receded,
as well as seasonally dry flood deltas. DO NOT make
applications to natural or man-made bodies of water such as
lakes, reservoirs, ponds, streams and canals.
ENVIRONMENTAL CONDITIONS
AND BIOLOGICAL ACTIVITY
VELPAR® L is absorbed through the roots and foliage.
Moisture is required to activate VELPAR® L in the soil.
Best results are obtained when the soil is moist at the time
of application and 1/4–1/2 inches of rainfall occurs within 2
weeks after application.
For best results, apply VELPAR® L preemergence or
postemergence when weeds are less than 2 inches in height or
diameter. Foliar activity is most effective under conditions of
high temper
a
ture (above 80 °F), high humidity, and good soil
moisture
. F
oliar acti
vity may be reduced when vegetation is
dormant, semi-dormant, or under stress.
On herbaceous plants,
symptoms usuall
y a
ppear within 2 w
eeks
after application under warm, humid conditions, while 4–6
weeks may be required when weather is cool or dry, or when
plants ar
e under stress. If rainfall after application is inadequate
to activate VELPAR® L in the soil, plants may recover from
contact effects and continue to grow.
On woody plants, symptoms usually appear within 3–6 weeks
after sufficient rainfall has carried the herbicide into the root
zone during periods of active growth. Defoliation and refoliation
may occur, but susceptible plants are killed.
The degree and duration of control may depend on the following:
• Use rate
• Weed spectrum and size at application
• Environmental conditions a
t and f
ollo
wing tr
ea
tment
Where a rate range is shown, use the higher levels of the dosage
range on hard-to-control species, fine-textured soils, or soils
c
ontaining greater than 5% organic matter or carbon. Use the
lower levels of the dosage range on coarse-textured soils and/or
o
n soils low in organic matter. Refer to specific uses for rate
ranges.
APPLICATION INFORMATION
VELPAR® L may be applied by ground equipment and, where
permitted, aerial equipment. Use rates, minimum spray
gallonage, and other application information are described for
the various uses.
Dispose of the equipment washwater by applying it to a use-
site listed on this label or in accordance with directions given
in the “Storage and Disposal” section of this label.
Before spraying, calibrate equipment to determine the
quantity of water necessary to uniformly and thoroughly cover
the vegetation and soil in a measured area to be treated.
TANK MIXTURES
VELPAR® L herbicide may be tank mixed with other
herbicides and /or adjuvants registered for the uses (crops)
specified in the label.
Refer to the label of the tank mix partner(s) for any additional
use instructions or restrictions.
NOTE: When the air temperature is around 32
o
F, tank
mixtures of “Gramoxone Max” (paraquat dichloride) plus
VELPAR® L may form a hard sludge in the spray tank.
This effect is most likely to occur when the tank mixture
comes into contact with aluminum.
RESISTANCE
When herbicides that affect the same biological site of
action are used repeatedly over several years to control the
same weed species in the same field, naturally-occurring
resistant biotypes may survive a correctly applied herbicide
tr
eatment, propagate, and become dominant in that field.
Adequate control of these resistant weed biotypes cannot be
expected. If weed control is unsatisfactory, it may be
necessary to retreat the problem area using a product
affecting a different site of action.
T
o better mana
ge herbicide resistance through delaying the
proliferation and possible dominance of herbicide resistant
weed biotypes, it may be necessary to change cultural
practices within and between crop seasons such as using a
combination of tillage, retreatment, tank-mix partners
and/or sequential herbicide applications that have a different
site of action. Weed escapes that are allowed to go to seed
will pr
omote the spread of resistant biotypes.
It is ad
visa
b
le to k
eep accurate records of pesticides applied
to indi
vidual f
ields to help obtain inf
or
mation on the spread
and dispersal of resistant biotypes. Consult your
a
gricultural dealer, consultant, applicator, and/or appropriate
sta
te a
g
ricultural extension service representative for
specific alternative cultural practices or herbicide
recommendations available in your area.
GENERAL INFORMATION
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