Iowa Commercial Pesticide Appl Right-of-Way
(Category 6) NEWEST EXAM 2026-2027
COMPLETE 75 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ BRAND NEW!!
Right-of-Way Category 6 Iowa Commercial Pesticide Application Manual
Dicamba - CORRECT ANSWER: Vanquish is less volatile than Banvel, reducing the risk of off-
target movement, soybeans are very sensitive to Dicamba.
Effect of spray droplet size on drift - CORRECT ANSWER: Droplet diameter: 10 um travels
7,480 ft; 100 um travels 77 ft
Explain some ways to prevent damage to nontarget plants - CORRECT ANSWER: The majority
of problems encountered in right-of-way spraying involve the phenoxy or similar herbicides,
they are injurious to plants at extremely low rates;
the two principle mechanisms by which a herbicide moves off-target are drift & volatilization,
herbicides may also move off-target in runoff water or be carried away with eroded sediment.
Explain the Integrated Roadside Vegetation Management program - CORRECT ANSWER: The
object of IRVM is to establish & maintain a safe, stable, low-maintenance roadside that is
healthy & attractive for humans & wildlife. Stability is attained by the use of native vegetation,
county roadside managers (CRM) mimic the durable, diverse prairie plant community that
existed in Iowa for thousands of years, alongwith the use of native & non-native grasses &
wildflowers, CRMs are integrating several different vegetation management techniques, in
addition to traditional use of herbicides & mowing, CRMs also employ nontraditional methods to
invigorate & sustain the vegetative cover. Burning is one such method. During the early spring
CRMs will select several sites to conduct a planned or prescribed burn, it will retard the growth
of many invading weeds & invigorate the existing prairie plants. Other important factors of
IRVM are low maintenance & adjacent landowner cooperation.
, Explain what drift is and what factors are responsible for problems encountered - CORRECT
ANSWER: Drift is the physical movement of spray droplets from the target site. The two
primary factors that effect the amount of drift are: spray droplet size & the wind speed;
Wind: problems at 5 mph, spraying should stop when wind exceeds 10 mph; Droplet size: as
droplet size decreases , the distance a droplet will travel off-target increases; select a nozzle that
produces an appropriate range of droplet sizes; as spray pressure is increased, the range of
droplet sizes produced will shift towards smaller droplets, operate the sprayer at a relatively low
pressure; also drift retardants can reduce the formation of small droplets, an invert emulsion is a
thick mixture of oil & water that has the consistency of mayonnaise, specialized spray equip
required.
Explain what herbicide runoff is and what factors are responsible for problems encountered -
CORRECT ANSWER: Herbicides also may move from the treated area in surface water runoff
or in sediment; the potential for herbicide loss is determined by many factors, including rainfall
events, amount of herbicide applied, & soil absorption characteristics of the herbicides;
herbicides are most vulnerable to runoff during the first rainfall event after application;
nonselective herbicides with a long soil residual should not be used in areas prone to runoff; hard
rain, problems; no vegetation, problems; herbicides with low soil adsorption & high water
solubilities (e.g., Tordon) can move from treated areas in surface runoff in the absence of soil
erosion, don't use in sloped areas.
Explain what volatilization is and what factors are responsible for problems encountered -
CORRECT ANSWER: Volatilization, also known as vapor drift, is due to evaporation of the
herbicide after it impinges on the soil or plant. Herbicides that have a high vapor pressure are
susceptible to vapor drift whenever temperatures exceed 85F; herbicides that are prone to
volatilization include the phenoxy herbicides & dicamba; available as ester ( more effective,
more volatile) or amine products; Dicamba (Banvel) is especially prone to volatilization, Clarity
& Vanquish contain the diglycolamine (DGA) salt of dicamba (they have a lower vapor pressure
than Banvel); soybeans are particularly sensitive to dicamba.
Fosamine - CORRECT ANSWER: Krenite is applied in late summer to woody species &
prevents leafing out next spring. Complete coverage of tree is required for a total kill.
Glyphosate - CORRECT ANSWER: Roundup Pro is for noncropland & forestry use; Accord is
for use in forestry & utility right-of-ways; Rodeo is for aquatic use.
(Category 6) NEWEST EXAM 2026-2027
COMPLETE 75 QUESTIONS AND CORRECT
DETAILED ANSWERS (VERIFIED ANSWERS)
ALREADY GRADED A+ BRAND NEW!!
Right-of-Way Category 6 Iowa Commercial Pesticide Application Manual
Dicamba - CORRECT ANSWER: Vanquish is less volatile than Banvel, reducing the risk of off-
target movement, soybeans are very sensitive to Dicamba.
Effect of spray droplet size on drift - CORRECT ANSWER: Droplet diameter: 10 um travels
7,480 ft; 100 um travels 77 ft
Explain some ways to prevent damage to nontarget plants - CORRECT ANSWER: The majority
of problems encountered in right-of-way spraying involve the phenoxy or similar herbicides,
they are injurious to plants at extremely low rates;
the two principle mechanisms by which a herbicide moves off-target are drift & volatilization,
herbicides may also move off-target in runoff water or be carried away with eroded sediment.
Explain the Integrated Roadside Vegetation Management program - CORRECT ANSWER: The
object of IRVM is to establish & maintain a safe, stable, low-maintenance roadside that is
healthy & attractive for humans & wildlife. Stability is attained by the use of native vegetation,
county roadside managers (CRM) mimic the durable, diverse prairie plant community that
existed in Iowa for thousands of years, alongwith the use of native & non-native grasses &
wildflowers, CRMs are integrating several different vegetation management techniques, in
addition to traditional use of herbicides & mowing, CRMs also employ nontraditional methods to
invigorate & sustain the vegetative cover. Burning is one such method. During the early spring
CRMs will select several sites to conduct a planned or prescribed burn, it will retard the growth
of many invading weeds & invigorate the existing prairie plants. Other important factors of
IRVM are low maintenance & adjacent landowner cooperation.
, Explain what drift is and what factors are responsible for problems encountered - CORRECT
ANSWER: Drift is the physical movement of spray droplets from the target site. The two
primary factors that effect the amount of drift are: spray droplet size & the wind speed;
Wind: problems at 5 mph, spraying should stop when wind exceeds 10 mph; Droplet size: as
droplet size decreases , the distance a droplet will travel off-target increases; select a nozzle that
produces an appropriate range of droplet sizes; as spray pressure is increased, the range of
droplet sizes produced will shift towards smaller droplets, operate the sprayer at a relatively low
pressure; also drift retardants can reduce the formation of small droplets, an invert emulsion is a
thick mixture of oil & water that has the consistency of mayonnaise, specialized spray equip
required.
Explain what herbicide runoff is and what factors are responsible for problems encountered -
CORRECT ANSWER: Herbicides also may move from the treated area in surface water runoff
or in sediment; the potential for herbicide loss is determined by many factors, including rainfall
events, amount of herbicide applied, & soil absorption characteristics of the herbicides;
herbicides are most vulnerable to runoff during the first rainfall event after application;
nonselective herbicides with a long soil residual should not be used in areas prone to runoff; hard
rain, problems; no vegetation, problems; herbicides with low soil adsorption & high water
solubilities (e.g., Tordon) can move from treated areas in surface runoff in the absence of soil
erosion, don't use in sloped areas.
Explain what volatilization is and what factors are responsible for problems encountered -
CORRECT ANSWER: Volatilization, also known as vapor drift, is due to evaporation of the
herbicide after it impinges on the soil or plant. Herbicides that have a high vapor pressure are
susceptible to vapor drift whenever temperatures exceed 85F; herbicides that are prone to
volatilization include the phenoxy herbicides & dicamba; available as ester ( more effective,
more volatile) or amine products; Dicamba (Banvel) is especially prone to volatilization, Clarity
& Vanquish contain the diglycolamine (DGA) salt of dicamba (they have a lower vapor pressure
than Banvel); soybeans are particularly sensitive to dicamba.
Fosamine - CORRECT ANSWER: Krenite is applied in late summer to woody species &
prevents leafing out next spring. Complete coverage of tree is required for a total kill.
Glyphosate - CORRECT ANSWER: Roundup Pro is for noncropland & forestry use; Accord is
for use in forestry & utility right-of-ways; Rodeo is for aquatic use.
