The Rural Voice, 1978-06, Page 26up and shaken, plant products authorities
suggest that• the contents be agitated by
rolling the cans a few times before the
chemical is poured into the sprayer.
Use of 2, 4-D amine is increasing
because of a shift in buyer preference.
About 2.7 million pounds of 2, 4-D amines
were sold in Canada in 1975, compared
with 4.7 million pounds of 2, 4-D esters.
Although the active ingredients in the
amine preparations have a tendency to
separate, the problem will not occur if the
label directions concerning storage are
followed closely. To be on the safe side
though, farmers should shake up 2. 4-D
amines before using them.
Settling -out also occurs in many other
pesticides products and farmers should
check label directions and consider rolling
or shaking most pesticide drums before
use.
Use proper surfactant,
crop specialist warns
There is a lot of confusion surrounding
the use of oils and surfactants according to
Pat Lynch, soils and crops specialist with
O.M.A.F. at Stratford.
Most of it stems from verbal claims
which are not supported by product labels.
Two points should be made. Under no
circumstances can you reduce the amount
of herbicide by merely adding a surfactant.
Secondly, surfactants or oils should never
be used with 2, 4-D, Embutox, Kil-mor,
Lasso or Bladex. Oils and surfactants
enhance the activity of these herbicides to
the point of damaging the cron.
Oils need only be applied to weeds that
are already growing. They are usually
applied at 1 to 11/2 gallons per acre. They
are especially useful on heavy infestations
of emerged grasses or on weeds that have
developed under dry or cool conditions.
Under these circumstances, oils are
superior to surfactants.
Surfactants are used merely to reduce
the volume of water applied. They are
usually applied at about one pint per acre.
Generally, surfactants do more crop
damage than do oils.
It's important to use only commercial
mixtures of oils and surfactants. Purchas-
ers should also check for the Pesticide
Registration No (PCP) on the label. This
number provides evidence that the product
is a reputable one.
WEED CONTROL IN ALFALFA
The only time to control weeds in alfalfa
is in the year of establishment. Since this
weed control must last for the life of the
stand, it must be done right. Embutox is
the only herbicide to use on alfalfa at
establishment. This herbicide can be
applied to direct seeded alfalfa or alfalfa
seeded down to grain.
Embutox should be applied at a rate of
12 to 16 oz. of acid per acre. This means
one gallon of Embutox will cover four to
five acres. Use the lower rate if the weed
population is low or if the crop is under
PG. 26. THE RURAL VOICE/JUNE 1978.
stress conditions. such as extreme drought
or cold. This herbicide should be applied in
15 to 20 gallons of water per acre.
Embutox will control mustard. only if the
mustard is one to two inches high. If at the
time of spraying, mustard is higher than
2", mix 2 oz. of MCPA 80 (1 oz. acid)/acre
with the Embutox. Higher rates of MCPA
will damage the alfalfa.
The timing of the Embutox application is
critical. It should be applied when alfalfa
has from 1 to 3 trifoliate leaves. Spraying
before or after this date can set back the
alfalfa. For more details see page 32 of the
1978 Guide to Chemical Weed Control.
SPRAY SPRING GRAIN EARLY
There are two main reasons for spraying
grain early. It is the weeds which are
growing during the early periods of cereal
growth (up to the five leaf stage) which
have the greatest effect on cereal yield. In
addition, the cereals are most resistant to
herbicides in the 5 to 6 leaf stage.
The different stages of _ cereal leaf
development are outlined on page 4 of the
Guide to Chemical Weed Control. The
generally recommended stage for spraying
is the two to six leaf stage. Too often this
task gets left until later with a resulting
damage to the crop and more competition
from the weeds.
Oats are less susceptible to injury from
MCPA than 2, 4-D. Thus MCPA should be
used in place of 2. 4-D for oats or mixed
grain.
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