Iowa Commercial Pesticide Applicator
Category 1A
After which stage should you not apply 2,4-D and MCPA to small grains? - correct
answer-Boot stage
Are Blazer, Basagran, Buctril, and Gramoxone Extra contact herbicides or translocated
herbicides? - correct answer-Contact herbicides
Are Roundup and Gramoxone Extra selective or nonselective herbicides? - correct
answer-Nonselective
Are Roundup, 2,4-D, Fusilade 2000, Poast Plus, Clarity, and Banvil contact herbicides or
translocted herbicides? - correct answer-Translocated herbicides
At above what approximate temperature does Banvel and ester based 2,4-D have increased
risk of vapor drift? - correct answer-85 (f)
At greater than what soil pH level should you not use Canopy, Preview, and Lorox Plus due
to carryover risk? - correct answer-6.8
Can additive injury occur when applying Sencor/Lexone on soybeans in fields with atrazine
carryover residues? - correct answer-Yes
Define photodecomposition - correct answer-Chemical breakdown caused by exposure to
light
Define translocated herbicides - correct answer-Herbicides which move in the phloem of
plants
Do translocated herbicides move up, down, or both ways in plants? - correct
answer-Because translocated herbicides move within the phloem, they can move both up
and down a plant.
How can you reduce particle drift? - correct answer-Use coarse sprays and drift control
agents while avoiding application during windy conditions
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.
In Iowa, when is the general time of year when temperatures rise too high to apply Banvel -
correct answer-Mid-June
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