Iowa Commercial Pesticide Applicator Category 1a Exam Questions With Verified Answers

Why do many pasture herbicides have grazing restrictions? {Ans: To prevent the occurrence of illegal residues in meat or milk}What can reduce the contamination of surface water by herbicides? {Ans: Grass buffer strips, terraces, conservation tillage, lower application rates}Are Roundup and Gramoxone Extra selective or nonselective herbicides? {Ans: Nonselective}Which type of weed can regrow from underground buds following tillage? {Ans: Creeping perennials}Name some herbicides which are very effective against germinating weeds but less effective on established weeds. {Ans: Frontier, Lasso, and Dual}What can occur as a result of harvesting crops before a labeled harvest interval elapses? {Ans: Illegal crop residues}When applying Prowl, Banvel, and Clarity in a corn crop, what practice can cause injury {Ans: Incorporation}When should annual broadleaf leaves be sprayed in pastures? {Ans: Spring, after they have fully expanded leaves}Which formulation of 2,4-D can drift in vapor form and which cannot? {Ans: Ester 2,4-D can vapor drift Amine 2,4-D cannot}Two herbicides which are more active on soils with a pH above 7.5 and can injure soybeans {Ans: Sencor and Lexone}What factors reduce the likelihood of herbicide leeching? {Ans: Low solubility, short persistence, and strong absorption}Why is Gramoxone