What is the greatest hazard when applying most herbicides? - Answer Injury to nontarget plants
Name some herbicides which are very effective against germinating weeds but less effective on established weeds. - Answer Frontier, Lasso, and Dual
What soil conditions reduce the activity of many h...
Iowa Commercial Pesticide Applicator Category 1A Exam
Questions With Verified Answers What is the greatest hazard when applying most herbicides? - Answer Injury to nontarget plants
Name some herbicides which are very effective against germinating weeds but less effective on established weeds. - Answer Frontier, Lasso, and Dual
What soil conditions reduce the activity of many herbicides and require increased rates for adequate weed control? - Answer Higher levels of soil organic matter or clay
Two herbicides which are more active on soils with a pH above 7.5 and can injure soybeans - Answer Sencor and Lexone
Where are high pH soils most common in Iowa? - Answer Next to limestone and gravel roads
Two herbicides that are more persistent and likely to carryover residues. - Answer Atrazine and chlorimuron
What factors can increase chances of herbicide carryover? - Answer Dry weather, high rates, late application, and in the case of some herbicides, high soil pH
Can additive injury occur when applying Sencor/Lexone on soybeans in fields with atrazine carryover residues? - Answer Yes
What do preemergence herbicides rely on to move the herbicide into the weed seed germination zone (top 1/2-1 inch) of soil? - Answer Rainfall or irrigation
What tillage tools will improve weed control when rainfall does not occur soon after herbicide application, and weeds begin emerging? - Answer Rotary Hoe and Harrow Name 3 herbicides which must be incorporated to prevent evaporation loss. - Answer Sultan+, Eradicane,
Eradicane Extra
Define photodecomposition - Answer Chemical breakdown caused by exposure to light
Name two herbicides that must be incorporated to prevent photodecomposition. - Answer Treflan, Sonalan
Why are Basagran, Blazer, Buctril, Poast Plus, and Fusilade 2000 only applied postemergence? - Answer They have little or no soil activity
Are Roundup and Gramoxone Extra selective or nonselective herbicides? - Answer Nonselective
Are Blazer, Basagran, Buctril, and Gramoxone Extra contact herbicides or translocated herbicides? - Answer Contact herbicides
Define translocated herbicides - Answer Herbicides which move in the phloem of plants
Do translocated herbicides move up, down, or both ways in plants? - Answer Because translocated herbicides move within the phloem, they can move both up and down a plant.
Are Roundup, 2,4-D, Fusilade 2000, Poast Plus, Clarity, and Banvil contact herbicides or translocted herbicides? - Answer Translocated herbicides
What is essential when using contact herbicides? - Answer Good spray coverage (usually involving high carrier volumes)
When is the best time (in regards to maximum weed control) to apply contact herbicides to annual weeds? - Answer When the weeds are small and actively growing
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