FLYINGHIGHER
Iowa
Commercial
Pesticide
Applicator
Category
1A
What
is
the
greatest
hazard
when
applying
most
herbicides?
-
ANS
Injury
to
nontarget
plants
Name
some
herbicides
which
are
very
effective
against
germinating
weeds
but
less
effective
on
established
weeds.
-
ANS
Frontier ,
Lasso,
and
Dual
What
soil
conditions
reduce
the
activity
of
many
herbicides
and
require
increased
rates
for
adequate
weed
control?
-
ANS
Higher
levels
of
soil
organic
matter
or
clay
Two
herbicides
which
are
more
active
on
soils
with
a
pH
above
7.5
and
can
injure
soybeans
-
ANS
Sencor
and
Lexone
Where
are
high
pH
soils
most
common
in
Iowa?
-
ANS
Next
to
limestone
and
gravel
roads
Two
herbicides
that
are
more
persistent
and
likely
to
carryover
residues.
-
ANS
Atrazine
and
chlorimuron
What
factors
can
increase
chances
of
herbicide
carryover?
-
ANS
Dry
weather ,
high
rates,
late
application,
and
in
the
case
of
some
herbicides,
high
soil
pH
Can
additive
injury
occur
when
applying
Sencor/Lexone
on
soybeans
in
fields
with
atrazine
carryover
residues?
-
ANS
Yes FLYINGHIGHER
What
do
preemergence
herbicides
rely
on
to
move
the
herbicide
into
the
weed
seed
germination
zone
(top
1/2-1
inch)
of
soil?
-
ANS
Rainfall
or
irrigation
What
tillage
tools
will
improve
weed
control
when
rainfall
does
not
occur
soon
after
herbicide
application,
and
weeds
begin
emerging?
-
ANS
Rotary
Hoe
and
Harrow
Name
3
herbicides
which
must
be
incorporated
to
prevent
evaporation
loss.
-
ANS
Sultan+,
Eradicane,
Eradicane
Extra
Define
photodecomposition
-
ANS
Chemical
breakdown
caused
by
exposure
to
light
Name
two
herbicides
that
must
be
incorporated
to
prevent
photodecomposition.
-
ANS
Treflan,
Sonalan
Why
are
Basagran,
Blazer ,
Buctril,
Poast
Plus,
and
Fusilade
2000
only
applied
postemergence?
-
ANS
They
have
little
or
no
soil
activity
Are
Roundup
and
Gramoxone
Extra
selective
or
nonselective
herbicides?
-
ANS
Nonselective
Are
Blazer ,
Basagran,
Buctril,
and
Gramoxone
Extra
contact
herbicides
or
translocated
herbicides?
-
ANS
Contact
herbicides
Define
translocated
herbicides
-
ANS
Herbicides
which
move
in
the
phloem
of
plants
Do
translocated
herbicides
move
up,
down,
or
both
ways
in
plants?
-
ANS
Because
translocated
herbicides
move
within
the
phloem,
they
can
move
both
up
and
down
a
plant.
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