AERIAL APPLICATOR EOC EXAM 2 TEST 2025/2026
QUESTIONS AND ANSWERS GRADED A+
✔✔What are some ways pesticides move off of application site? - ✔✔Volatilization into
the atmosphere, leaching through the soil, rainfall washing application, blowing off the
site after being attached to dust, residues on harvested crops, carried on people or
vehicles, inversion cloud.
✔✔What is the counter to volatilization? - ✔✔Pesticides with a low volatility rating
✔✔What is the counter to leaching through the soil? - ✔✔Pesticides with low solubility
in water
✔✔What is the counter to rainfall washing residues off plant? - ✔✔Pesticides with high
absorption potential
✔✔NCODM - ✔✔National Coalition on Drift Minimization
✔✔Spray Drift - ✔✔The movement of pesticide through the air at the time of pesticide
application or soon thereafter from the target site to any non- or off-target site.
✔✔What is not considered spray drift? - ✔✔Erosion, migration, volatility, or windblown
soil particles
✔✔What are key factors affecting drift? - ✔✔Spray droplets and the percentage of
droplets within a certain size range
✔✔Micron - ✔✔The unit of measure of a spray droplet
✔✔What is 1 micron converted to inches? - ✔✔1/25000 in
✔✔How does the size of a spray droplet affect drift? - ✔✔The smaller the droplet, the
longer it will stay in the air meaning there is a higher chance of drift
✔✔Driftable fines - ✔✔Droplets that are less than 200 microns
✔✔Droplet-size spectrum - ✔✔Range of droplet sizes nozzles produce
✔✔Volume Median Diameter (VMD) - ✔✔Nozzle listed diameter that states half of the
droplets are less than this number and the other half is greater than this
✔✔ASABE - ✔✔American Society of Agricultural and Biological Engineers
, ✔✔What is the most useful spray classification system? - ✔✔ASABE's S-572.1: Spray
Nozzle Classification by Droplet Spectra
✔✔What are the 8 categories in S-572.1? - ✔✔extra fine, very fine, fine, medium,
coarse, very coarse, extra coarse, and ultra coarse
✔✔What three physical properties of a spray mixture have a significant effect on the
droplet size in aerial applications? - ✔✔Dynamic surface tension, extensional viscosity,
and shear viscosity
✔✔Dynamic Surface Tension - ✔✔How easily a droplet splits into smaller droplets
✔✔Extensional Viscosity - ✔✔The stretchiness of a liquid before it turns into a droplet.
Affected by pressure.
✔✔Shear Viscosity - ✔✔A liquids resistance to flow.
✔✔What can be added to a mixture to make it have a higher shear viscosity? -
✔✔Spray mixture adjuvants
✔✔What are some of the external factors that affect droplet size and drift? -
✔✔Evaporation, co-distillation, wind, and temperature inversions
✔✔Co-distillation - ✔✔Occurs when the pesticide contacts very hot surfaces, usually
the soil with no vegetation. Rapid evaporation.
✔✔Thermals - ✔✔Rising air due to temperature change in the ground. Cold to hot.
✔✔Temperature Inversions - ✔✔Differing air temperatures in the stratified layers of the
atmosphere that create a horizontal wall.
✔✔Pesticide Cloud - ✔✔Created when spraying in temperature inversion conditions
✔✔What is the order of color codes for S-572.1 - ✔✔Purple, Red, Orange, Yellow, Blue,
Green, White, Black
✔✔Managing off-target pesticide drift during an aerial application is: - ✔✔The pilot's
responsibility
✔✔Off-target pesticide drift is the offsite movement of the pesticide that occurs: - ✔✔At
the time of pesticide application or soon thereafter
QUESTIONS AND ANSWERS GRADED A+
✔✔What are some ways pesticides move off of application site? - ✔✔Volatilization into
the atmosphere, leaching through the soil, rainfall washing application, blowing off the
site after being attached to dust, residues on harvested crops, carried on people or
vehicles, inversion cloud.
✔✔What is the counter to volatilization? - ✔✔Pesticides with a low volatility rating
✔✔What is the counter to leaching through the soil? - ✔✔Pesticides with low solubility
in water
✔✔What is the counter to rainfall washing residues off plant? - ✔✔Pesticides with high
absorption potential
✔✔NCODM - ✔✔National Coalition on Drift Minimization
✔✔Spray Drift - ✔✔The movement of pesticide through the air at the time of pesticide
application or soon thereafter from the target site to any non- or off-target site.
✔✔What is not considered spray drift? - ✔✔Erosion, migration, volatility, or windblown
soil particles
✔✔What are key factors affecting drift? - ✔✔Spray droplets and the percentage of
droplets within a certain size range
✔✔Micron - ✔✔The unit of measure of a spray droplet
✔✔What is 1 micron converted to inches? - ✔✔1/25000 in
✔✔How does the size of a spray droplet affect drift? - ✔✔The smaller the droplet, the
longer it will stay in the air meaning there is a higher chance of drift
✔✔Driftable fines - ✔✔Droplets that are less than 200 microns
✔✔Droplet-size spectrum - ✔✔Range of droplet sizes nozzles produce
✔✔Volume Median Diameter (VMD) - ✔✔Nozzle listed diameter that states half of the
droplets are less than this number and the other half is greater than this
✔✔ASABE - ✔✔American Society of Agricultural and Biological Engineers
, ✔✔What is the most useful spray classification system? - ✔✔ASABE's S-572.1: Spray
Nozzle Classification by Droplet Spectra
✔✔What are the 8 categories in S-572.1? - ✔✔extra fine, very fine, fine, medium,
coarse, very coarse, extra coarse, and ultra coarse
✔✔What three physical properties of a spray mixture have a significant effect on the
droplet size in aerial applications? - ✔✔Dynamic surface tension, extensional viscosity,
and shear viscosity
✔✔Dynamic Surface Tension - ✔✔How easily a droplet splits into smaller droplets
✔✔Extensional Viscosity - ✔✔The stretchiness of a liquid before it turns into a droplet.
Affected by pressure.
✔✔Shear Viscosity - ✔✔A liquids resistance to flow.
✔✔What can be added to a mixture to make it have a higher shear viscosity? -
✔✔Spray mixture adjuvants
✔✔What are some of the external factors that affect droplet size and drift? -
✔✔Evaporation, co-distillation, wind, and temperature inversions
✔✔Co-distillation - ✔✔Occurs when the pesticide contacts very hot surfaces, usually
the soil with no vegetation. Rapid evaporation.
✔✔Thermals - ✔✔Rising air due to temperature change in the ground. Cold to hot.
✔✔Temperature Inversions - ✔✔Differing air temperatures in the stratified layers of the
atmosphere that create a horizontal wall.
✔✔Pesticide Cloud - ✔✔Created when spraying in temperature inversion conditions
✔✔What is the order of color codes for S-572.1 - ✔✔Purple, Red, Orange, Yellow, Blue,
Green, White, Black
✔✔Managing off-target pesticide drift during an aerial application is: - ✔✔The pilot's
responsibility
✔✔Off-target pesticide drift is the offsite movement of the pesticide that occurs: - ✔✔At
the time of pesticide application or soon thereafter
