IOWA COMMERCIAL PESTICIDE APPLICATOR
CATEGORY 1A ACTUAL 2026 QUESTIONS AND
VERIFIED ANSWERS
Save
Practice questions for this set
Learn 1 /7 Study with Learn
Herbicide-resistant weed biotypes
Choose an answer
Repeated use of herbicides with
What is the greatest hazard when
1 2 the same mode of action can result
applying most herbicides?
in what?
Name two herbicides that must be
Where are high pH soils most
3 incorporated to prevent 4
common in Iowa?
photodecomposition.
Don't know?
Terms in this set (49)
, What is the greatest hazard when Injury to nontarget plants
applying most herbicides?
Name some herbicides which are Frontier, Lasso, and Dual
very effective against germinating
weeds but less effective on
established weeds.
What soil conditions reduce the Higher levels of soil organic matter or clay
activity of many herbicides and
require increased rates for
adequate weed control?
Two herbicides which are more Sencor and Lexone
active on soils with a pH above 7.5
and can injure soybeans
Where are high pH soils most Next to limestone and gravel roads
common in Iowa?
Two herbicides that are more Atrazine and chlorimuron
persistent and likely to carryover
residues.
What factors can increase chances Dry weather, high rates, late application, and in
of herbicide carryover? the case of some herbicides, high soil pH
Can additive injury occur when Yes
applying Sencor/Lexone on
soybeans in fields with atrazine
carryover residues?
CATEGORY 1A ACTUAL 2026 QUESTIONS AND
VERIFIED ANSWERS
Save
Practice questions for this set
Learn 1 /7 Study with Learn
Herbicide-resistant weed biotypes
Choose an answer
Repeated use of herbicides with
What is the greatest hazard when
1 2 the same mode of action can result
applying most herbicides?
in what?
Name two herbicides that must be
Where are high pH soils most
3 incorporated to prevent 4
common in Iowa?
photodecomposition.
Don't know?
Terms in this set (49)
, What is the greatest hazard when Injury to nontarget plants
applying most herbicides?
Name some herbicides which are Frontier, Lasso, and Dual
very effective against germinating
weeds but less effective on
established weeds.
What soil conditions reduce the Higher levels of soil organic matter or clay
activity of many herbicides and
require increased rates for
adequate weed control?
Two herbicides which are more Sencor and Lexone
active on soils with a pH above 7.5
and can injure soybeans
Where are high pH soils most Next to limestone and gravel roads
common in Iowa?
Two herbicides that are more Atrazine and chlorimuron
persistent and likely to carryover
residues.
What factors can increase chances Dry weather, high rates, late application, and in
of herbicide carryover? the case of some herbicides, high soil pH
Can additive injury occur when Yes
applying Sencor/Lexone on
soybeans in fields with atrazine
carryover residues?
