IOWA HERBICIDE RIGHT OF WAY CATEGORY 6
FULL QUESTIONS AND CORRECT ANSWERS
2026 GRADED A+
◉ What are roadside management objectives? Answer: 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? Answer: 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?
Answer: 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?
Answer: 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. Answer: 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?
Answer: 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. Answer: 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
FULL QUESTIONS AND CORRECT ANSWERS
2026 GRADED A+
◉ What are roadside management objectives? Answer: 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? Answer: 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?
Answer: 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?
Answer: 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. Answer: 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?
Answer: 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. Answer: 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
