Iowa Commercial Pesticide Applicator Category 1A
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is the greatest hazard when applying most herbicides?
A. Injury to crops
B. Injury to nontarget plants
C. Soil contamination
D. Water pollution
Answer: B. Injury to nontarget plants
2. Which herbicides are most effective against germinating weeds but less
effective on established weeds?
A. Roundup and Gramoxone
B. Frontier, Lasso, and Dual
C. 2,4-D and Banvel
D. Atrazine and Clarity
Answer: B. Frontier, Lasso, and Dual
3. Which soil conditions reduce herbicide activity and may require increased
application rates?
A. Sandy, low organic matter soils
B. Wet, flooded soils
C. High organic matter or high clay content
,D. Acidic, low pH soils
Answer: C. High organic matter or high clay content
4. Which herbicides are more active in soils with pH above 7.5 and may injure
soybeans?
A. Sencor and Lexone
B. Roundup and Poast
C. Atrazine and Dual
D. Blazer and Basagran
Answer: A. Sencor and Lexone
5. Where are high pH soils most commonly found in Iowa?
A. River valleys
B. Forest regions
C. Near limestone and gravel roads
D. Wetlands
Answer: C. Near limestone and gravel roads
6. Which herbicides are known for persistence and potential carryover injury?
A. Poast and Fusilade
B. Atrazine and chlorimuron
C. Gramoxone and Roundup
D. Basagran and Blazer
Answer: B. Atrazine and chlorimuron
7. Which conditions increase the risk of herbicide carryover?
A. Cool, wet weather and low rates
B. Dry weather, high rates, and late application
C. Early planting and low pH soils
, D. Frequent irrigation and low soil temperature
Answer: B. Dry weather, high rates, and late application
8. Can additive injury occur when Sencor/Lexone is applied in fields with
atrazine carryover?
A. No
B. Yes
C. Only in sandy soils
D. Only under irrigation
Answer: B. Yes
9. What moves preemergence herbicides into the weed germination zone?
A. Wind
B. Temperature
C. Rainfall or irrigation
D. Soil microbes
Answer: C. Rainfall or irrigation
10. Which tillage tools can improve weed control when rainfall is delayed?
A. Moldboard plow and disk
B. Rotary hoe and harrow
C. Cultivator and chisel plow
D. Planter and sprayer
Answer: B. Rotary hoe and harrow
11. Which herbicides require incorporation to prevent evaporation loss?
A. Roundup, Clarity, Gramoxone
B. Sultan+, Eradicane, Eradicane Extra
C. Basagran, Blazer, Poast
Comprehensive Resource To Help You Ace 2026-2027 Exams
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update!!
1. What is the greatest hazard when applying most herbicides?
A. Injury to crops
B. Injury to nontarget plants
C. Soil contamination
D. Water pollution
Answer: B. Injury to nontarget plants
2. Which herbicides are most effective against germinating weeds but less
effective on established weeds?
A. Roundup and Gramoxone
B. Frontier, Lasso, and Dual
C. 2,4-D and Banvel
D. Atrazine and Clarity
Answer: B. Frontier, Lasso, and Dual
3. Which soil conditions reduce herbicide activity and may require increased
application rates?
A. Sandy, low organic matter soils
B. Wet, flooded soils
C. High organic matter or high clay content
,D. Acidic, low pH soils
Answer: C. High organic matter or high clay content
4. Which herbicides are more active in soils with pH above 7.5 and may injure
soybeans?
A. Sencor and Lexone
B. Roundup and Poast
C. Atrazine and Dual
D. Blazer and Basagran
Answer: A. Sencor and Lexone
5. Where are high pH soils most commonly found in Iowa?
A. River valleys
B. Forest regions
C. Near limestone and gravel roads
D. Wetlands
Answer: C. Near limestone and gravel roads
6. Which herbicides are known for persistence and potential carryover injury?
A. Poast and Fusilade
B. Atrazine and chlorimuron
C. Gramoxone and Roundup
D. Basagran and Blazer
Answer: B. Atrazine and chlorimuron
7. Which conditions increase the risk of herbicide carryover?
A. Cool, wet weather and low rates
B. Dry weather, high rates, and late application
C. Early planting and low pH soils
, D. Frequent irrigation and low soil temperature
Answer: B. Dry weather, high rates, and late application
8. Can additive injury occur when Sencor/Lexone is applied in fields with
atrazine carryover?
A. No
B. Yes
C. Only in sandy soils
D. Only under irrigation
Answer: B. Yes
9. What moves preemergence herbicides into the weed germination zone?
A. Wind
B. Temperature
C. Rainfall or irrigation
D. Soil microbes
Answer: C. Rainfall or irrigation
10. Which tillage tools can improve weed control when rainfall is delayed?
A. Moldboard plow and disk
B. Rotary hoe and harrow
C. Cultivator and chisel plow
D. Planter and sprayer
Answer: B. Rotary hoe and harrow
11. Which herbicides require incorporation to prevent evaporation loss?
A. Roundup, Clarity, Gramoxone
B. Sultan+, Eradicane, Eradicane Extra
C. Basagran, Blazer, Poast
