IOWA COMMERCIAL PESTICIDE
APPLICATOR CATEGORY 1A 2026/2027
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
1. Why is Gramoxone Extra a restricted-use pesticide? - correct
answer-It is relatively high in toxicity to humans with an LD50
of 120 mg/kg
2. Why is Tordon a restricted-use pesticide? - correct answer-It
is hazardous to non-target broadleafs and has a potential to
remain active in soil for more than a year.
3. After which stage should you not apply 2,4-D and MCPA to
small grains? - correct answer-Boot stage
4. If you plan on using 2,4-D amine on oats underseeded with a
legume, what should you wait for before applyication? -
correct answer-Weeds and oats should be 6-12 inches tall
and form a protective canopy over the legume.
, 5. What is a benefit to using Eptam, Balan, and Poast Plus
when seeding alfalfa? - correct answer-A small grain
companion crop is not required
6. When should annual broadleaf leaves be sprayed in
pastures? - correct answer-Spring, after they have fully
expanded leaves
7. Why do many pasture herbicides have grazing restrictions? -
correct answer-To prevent the occurrence of illegal residues
in meat or milk
8. At greater than what soil pH level should you not use
Canopy, Preview, and Lorox Plus due to carryover risk? -
correct answer-6.8
9. What practice will reduce vapor drift risk of the herbicide
Command? - correct answer-Incorporation
10. Within how many feet of towns and commercial
fruit/vegetable production should you not use Command? -
correct answer-1,000
APPLICATOR CATEGORY 1A 2026/2027
ACTUAL QUESTIONS WITH VERIFIED
ANSWERS.
1. Why is Gramoxone Extra a restricted-use pesticide? - correct
answer-It is relatively high in toxicity to humans with an LD50
of 120 mg/kg
2. Why is Tordon a restricted-use pesticide? - correct answer-It
is hazardous to non-target broadleafs and has a potential to
remain active in soil for more than a year.
3. After which stage should you not apply 2,4-D and MCPA to
small grains? - correct answer-Boot stage
4. If you plan on using 2,4-D amine on oats underseeded with a
legume, what should you wait for before applyication? -
correct answer-Weeds and oats should be 6-12 inches tall
and form a protective canopy over the legume.
, 5. What is a benefit to using Eptam, Balan, and Poast Plus
when seeding alfalfa? - correct answer-A small grain
companion crop is not required
6. When should annual broadleaf leaves be sprayed in
pastures? - correct answer-Spring, after they have fully
expanded leaves
7. Why do many pasture herbicides have grazing restrictions? -
correct answer-To prevent the occurrence of illegal residues
in meat or milk
8. At greater than what soil pH level should you not use
Canopy, Preview, and Lorox Plus due to carryover risk? -
correct answer-6.8
9. What practice will reduce vapor drift risk of the herbicide
Command? - correct answer-Incorporation
10. Within how many feet of towns and commercial
fruit/vegetable production should you not use Command? -
correct answer-1,000
