Iowa Commercial Pesticide Applicator Category 1A verified to pass 2024

Iowa Commercial Pesticide Applicator Category 1AWhat is the greatest hazard when applying most herbicides? - correct answer Injury to no target plants Name some herbicides which are very effective against germinating weeds but less effective on established weeds. - correct answer Frontier, Lasso, and Dual What soil conditions reduce the activity of many herbicides and require increased rates for adequate weed control? - correct 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 - correct answer Sencor and Lexone Where are high pH soils most common in Iowa? - correct answer Next to limestone and gravel roads Two herbicides that are more persistent and likely to carryover residues. - correct answer Atrazine and chlorimuron What factors can increase chances of herbicide carryover? - correct 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? - correct 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? - correct answer Rainfall or irrigation What tillage tools will improve weed control when rainfall does not occur soon after herbicide application, and weeds begin emerging? - correct answer Rotary Hoe and Harrow