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 e
what is the term for the downward movement of pest
what is a disadvantage of using an ultra low volum
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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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