Iowa Commercial Pesticide Applicator Category 1a Latest Update Graded A

Where are high pH soils most common in Iowa? {Ans: Next to limestone and gravel roads}Name two herbicides that must be incorporated to prevent photodecomposition. {Ans: Treflan, Sonalan}Why are re-entry intervals required for pesticides such as Gramoxone Extra? {Ans: They are highly toxic to warm-blooded animals}Can additive injury occur when applying Sencor/Lexone on soybeans in fields with atrazine carryover residues? {Ans: Yes}What can occur as a result of harvesting crops before a labeled harvest interval elapses? {Ans: Illegal crop residues}Repeated use of herbicides with the same mode of action can result in what? {Ans: Herbicide-resistant weed biotypes}