Iowa Herbicide Right of Way -
Category 6 with questions and well
verified answers actual exam!!!
2026
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
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?
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
D. They persist in the soil for several years
Little effect is seen the year of application - ANSWER -Krenite is different from most
brush herbicides because:
A. It can be applied either to the foliage or the soil
B. Little effect is seen the year of application
C. Both A and B
D. None of the above
Wettable powders - ANSWER -Which of the following formulations do not dissolve in
water?
A. Wettable powders
B. Soluble powders
C. Emulsifiable concentrate
Category 6 with questions and well
verified answers actual exam!!!
2026
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
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?
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
D. They persist in the soil for several years
Little effect is seen the year of application - ANSWER -Krenite is different from most
brush herbicides because:
A. It can be applied either to the foliage or the soil
B. Little effect is seen the year of application
C. Both A and B
D. None of the above
Wettable powders - ANSWER -Which of the following formulations do not dissolve in
water?
A. Wettable powders
B. Soluble powders
C. Emulsifiable concentrate
