Iowa Herbicide Right of Way -
Category 6 with questions and well
verified answers actual exam!!!
2026
They do not damage grasses - ANSWER -Phenoxy herbicides are widely used along
roadsides because:
A. They are effective on a wide variety of broadleaf and woody species
B. They rarely damage plants in adjacent areas
C. They are high in human toxicity
D. They do not damage grasses
E. Both A and D
Dichlobenil - ANSWER -Which of the following nonselective herbicides has the longest
period of control, when used at a given site:
A. Bromacil
B. Dichlobenil
C. Prometon
D. Tebuthiuron
During early flowering - ANSWER -When is the best time to treat many perennials
developing from an established root system?
in early spring when sod has greened - ANSWER -Growth regulator application is most
effective when applied:
A. in early spring when sod has greened
, B. in late spring when sod has grown at least 2"
C. after 3 times mowing
D. in fall just prior to leaf fall
Both B and C - ANSWER -Which procedures will help reduce herbicide drift?
A. Increasing spray pressure
B. Reducing spray pressure
C. Hanging nozzles to a type which emits larger droplets
D. Reducing height of boom
E. Both B and C
Outside an area equal to twice the height of the desirable trees - ANSWER -In order to
avoid injury to nearby desirable trees; persistent, nonselective herbicides such as Hyvar should
be applied:
A. Only in the fall
B. Outside the drip line of the desirable trees
C. At least 10 feet from the desirable trees
D. Outside an area equal to twice the height of the desirable trees
E. A minimum of 1/2 mile from the desirable trees
The bark prevents penetration of the herbicide and reduces effectiveness - ANSWER -
Basal bark treatment is not recommended for wood species larger than 6" in diameter
because:
A. The bark prevents penetration of the herbicide and reduces effectiveness
B. The cost is prohibitive
C. There is a high risk of drift
D. None of the above
They can damage desirable plants at very low rates, making them susceptible to drift damage -
ANSWER -A major disadvantage of the phenoxy-herbicides is:
A. They are non-selective herbicides
B. They can damage desirable plants at very low rates, making them susceptible to drift
damage
C. They are highly toxic to wildlife
Category 6 with questions and well
verified answers actual exam!!!
2026
They do not damage grasses - ANSWER -Phenoxy herbicides are widely used along
roadsides because:
A. They are effective on a wide variety of broadleaf and woody species
B. They rarely damage plants in adjacent areas
C. They are high in human toxicity
D. They do not damage grasses
E. Both A and D
Dichlobenil - ANSWER -Which of the following nonselective herbicides has the longest
period of control, when used at a given site:
A. Bromacil
B. Dichlobenil
C. Prometon
D. Tebuthiuron
During early flowering - ANSWER -When is the best time to treat many perennials
developing from an established root system?
in early spring when sod has greened - ANSWER -Growth regulator application is most
effective when applied:
A. in early spring when sod has greened
, B. in late spring when sod has grown at least 2"
C. after 3 times mowing
D. in fall just prior to leaf fall
Both B and C - ANSWER -Which procedures will help reduce herbicide drift?
A. Increasing spray pressure
B. Reducing spray pressure
C. Hanging nozzles to a type which emits larger droplets
D. Reducing height of boom
E. Both B and C
Outside an area equal to twice the height of the desirable trees - ANSWER -In order to
avoid injury to nearby desirable trees; persistent, nonselective herbicides such as Hyvar should
be applied:
A. Only in the fall
B. Outside the drip line of the desirable trees
C. At least 10 feet from the desirable trees
D. Outside an area equal to twice the height of the desirable trees
E. A minimum of 1/2 mile from the desirable trees
The bark prevents penetration of the herbicide and reduces effectiveness - ANSWER -
Basal bark treatment is not recommended for wood species larger than 6" in diameter
because:
A. The bark prevents penetration of the herbicide and reduces effectiveness
B. The cost is prohibitive
C. There is a high risk of drift
D. None of the above
They can damage desirable plants at very low rates, making them susceptible to drift damage -
ANSWER -A major disadvantage of the phenoxy-herbicides is:
A. They are non-selective herbicides
B. They can damage desirable plants at very low rates, making them susceptible to drift
damage
C. They are highly toxic to wildlife
