IOWA COMMERCIAL PESTICIDE APPL: RIGHT-OF-WAY
(CATEGORY 6) EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS
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.
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
(CATEGORY 6) EXAM QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS
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.
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
