Iowa Commercial Pesticide Appl: Right-of-Way (Category 6) With Complete Solutions Latest Update
Iowa Commercial Pesticide Appl: Right-of-Way
(Category 6) With Complete Solutions Latest
Update
Who's Responsible? - ✔✔✔-An applicator is responsible for any damage to private
or public property resulting from careless application or misuse of herbicides
What are roadside management objectives? - ✔✔✔-The current goal of many
roadside management programs is to 1) control only those plants listed as noxious
weeds or 2) plants that interfere with the vision of motorists, 3) inhibit the flow of
water through drainage ditches, 4) pose a fire hazard, or 5) interfere with activities
of humans in other manners. Spot treatments of problem areas, rather than
broadcast applications, are commonly used along roadsides.
What management techniques do counties use to maintain prairie vegetation on
roadsides? - ✔✔✔-Counties integrate several different management techniques to
maintain a strong, healthy plant community. Techniques include 1) spot spraying
perennial weeds, 2) mowing of annual & biennial weeds to control seed production,
and 3) periodic burning to recycle nutrients & increase plant diversity.
What are the most commonly used herbicides for roadside use? - ✔✔✔-The most
commonly used herbicides for roadsides are postemergence chemicals that
selectively control herbaceous, broadleaf plants without injuring grasses
What types of herbicides are registered for use in rights-of-way? - ✔✔✔-The
majority of these products are either growth regulator herbicides or ALS-inhibiting
herbicides. These herbicides are classified according to their mode of action, or
how they kill plants.
List some common growth regulator herbicides - ✔✔✔-Growth regulator herbicides
include the 1) phenoxy products (2,4-D; 2,4-DP; and MCPP), 2) dicamba (Banvel),
3) triclopyr (Garlon), 4) picloram (Tordon) and 5) clopyralid (Stinger). To broaden
the spectrum of control, these herbicides are often tank-mixed or formulated as
products that contain more than one active ingredient (e.g., Crossbow is a
combination of 2,4-D and triclopyr. The specific combination used should be based
on weeds present, rather than indiscriminately adding herbicides to the spray tank.
©®™ Page 1
, Iowa Commercial Pesticide Appl: Right-of-Way (Category 6) With Complete Solutions Latest Update
What are some characteristics of growth regulator herbicides? - ✔✔✔-Most of these
herbicides are rapidly degraded in the soil; thus, they provide little residual control.
Only weeds that are established at the time of application will be controlled. All of
the growth regulator herbicides are translocated within the plant, making them
effective for both annual & perennial weeds.
List some common ALS-inhibiting herbicides - ✔✔✔-ALS is an enzyme involved in
the synthesis of specific amino acids in plants. 1) Sulfrometuron (Oust) and 2)
chlorsulfuron (Telar) are the most common ALS-inhibitors used on roadsides for
broadleaf control. Certain perennial grasses, including tall fescue & smooth brome,
have a relatively low tolerance to these chemicals & may be injured under certain
conditions, follow label rates carefully. Plateau (Imazapic) and Journey (Imazapic &
glyphosate) are other ALS-inhibitors; Plateau is unique in that it is safe to use on
native grass & wildflower plantings.
What are the best times for applications? - ✔✔✔-Generally , herbicides are most
effective when applied to actively growing plants, applications should be avoided
during hot, dry periods of midsummer.
ANNUAL weeds, such as velvetleaf & pigweed, are easiest to control early in the
spring while they are still small.
Musk thistle, common mullen, & other BIENNIALS should be treated in the fall or
early spring while they are still in the rosette stage. Biennials become fairly
tolerant to most herbicides once the flower stalk begins to elongate.
Optimum control of PERENNIALS, such as Canada thistle & field bindweed, can
often be achieved with applications made while the plant is in early bloom. Two
applications of a herbicide may be required to provide effective control of some
perennials.
Why should you be especially careful treating roadsides with selective herbicides? -
✔✔✔-The ability of the phenoxy & other selective herbicides to selectively control
broadleaf weeds in grass areas makes them especially useful along roadsides.
However, the herbicides can cause severe injury to nearby nontarget plants if
applied carelessly. Precautions must be taken to prevent physical drift or
volatilization from carrying the herbicide off the target site.
©®™ Page 2
Iowa Commercial Pesticide Appl: Right-of-Way
(Category 6) With Complete Solutions Latest
Update
Who's Responsible? - ✔✔✔-An applicator is responsible for any damage to private
or public property resulting from careless application or misuse of herbicides
What are roadside management objectives? - ✔✔✔-The current goal of many
roadside management programs is to 1) control only those plants listed as noxious
weeds or 2) plants that interfere with the vision of motorists, 3) inhibit the flow of
water through drainage ditches, 4) pose a fire hazard, or 5) interfere with activities
of humans in other manners. Spot treatments of problem areas, rather than
broadcast applications, are commonly used along roadsides.
What management techniques do counties use to maintain prairie vegetation on
roadsides? - ✔✔✔-Counties integrate several different management techniques to
maintain a strong, healthy plant community. Techniques include 1) spot spraying
perennial weeds, 2) mowing of annual & biennial weeds to control seed production,
and 3) periodic burning to recycle nutrients & increase plant diversity.
What are the most commonly used herbicides for roadside use? - ✔✔✔-The most
commonly used herbicides for roadsides are postemergence chemicals that
selectively control herbaceous, broadleaf plants without injuring grasses
What types of herbicides are registered for use in rights-of-way? - ✔✔✔-The
majority of these products are either growth regulator herbicides or ALS-inhibiting
herbicides. These herbicides are classified according to their mode of action, or
how they kill plants.
List some common growth regulator herbicides - ✔✔✔-Growth regulator herbicides
include the 1) phenoxy products (2,4-D; 2,4-DP; and MCPP), 2) dicamba (Banvel),
3) triclopyr (Garlon), 4) picloram (Tordon) and 5) clopyralid (Stinger). To broaden
the spectrum of control, these herbicides are often tank-mixed or formulated as
products that contain more than one active ingredient (e.g., Crossbow is a
combination of 2,4-D and triclopyr. The specific combination used should be based
on weeds present, rather than indiscriminately adding herbicides to the spray tank.
©®™ Page 1
, Iowa Commercial Pesticide Appl: Right-of-Way (Category 6) With Complete Solutions Latest Update
What are some characteristics of growth regulator herbicides? - ✔✔✔-Most of these
herbicides are rapidly degraded in the soil; thus, they provide little residual control.
Only weeds that are established at the time of application will be controlled. All of
the growth regulator herbicides are translocated within the plant, making them
effective for both annual & perennial weeds.
List some common ALS-inhibiting herbicides - ✔✔✔-ALS is an enzyme involved in
the synthesis of specific amino acids in plants. 1) Sulfrometuron (Oust) and 2)
chlorsulfuron (Telar) are the most common ALS-inhibitors used on roadsides for
broadleaf control. Certain perennial grasses, including tall fescue & smooth brome,
have a relatively low tolerance to these chemicals & may be injured under certain
conditions, follow label rates carefully. Plateau (Imazapic) and Journey (Imazapic &
glyphosate) are other ALS-inhibitors; Plateau is unique in that it is safe to use on
native grass & wildflower plantings.
What are the best times for applications? - ✔✔✔-Generally , herbicides are most
effective when applied to actively growing plants, applications should be avoided
during hot, dry periods of midsummer.
ANNUAL weeds, such as velvetleaf & pigweed, are easiest to control early in the
spring while they are still small.
Musk thistle, common mullen, & other BIENNIALS should be treated in the fall or
early spring while they are still in the rosette stage. Biennials become fairly
tolerant to most herbicides once the flower stalk begins to elongate.
Optimum control of PERENNIALS, such as Canada thistle & field bindweed, can
often be achieved with applications made while the plant is in early bloom. Two
applications of a herbicide may be required to provide effective control of some
perennials.
Why should you be especially careful treating roadsides with selective herbicides? -
✔✔✔-The ability of the phenoxy & other selective herbicides to selectively control
broadleaf weeds in grass areas makes them especially useful along roadsides.
However, the herbicides can cause severe injury to nearby nontarget plants if
applied carelessly. Precautions must be taken to prevent physical drift or
volatilization from carrying the herbicide off the target site.
©®™ Page 2
