Iowa Commercial Pesticide Appl: Right-Of-Way (Category 6) Questions With Correct Answers

Summary of roadside management {Ans: A combination of cultural, mechanical, & chemical weed control practices often will provide the best results.}Explain what drift is and what factors are responsible for problems encountered {Ans: Drift is the physical movement of spray droplets from the target site. The two primary factors that effect the amount of drift are: spray droplet size & the wind speed; Wind: problems at 5 mph, spraying should stop when wind exceeds 10 mph; Droplet size: as droplet size decreases , the distance a droplet will travel off-target increases; select a nozzle that produces an appropriate range of droplet sizes; as spray pressure is increased, the range of droplet sizes produced will shift towards smaller droplets, operate the sprayer at a relatively low pressure; also drift retardants can reduce the formation of small droplets, an invert emulsion is a thick mixture of oil & water that has the consistency of mayonnaise, specialized spray equip required.}What management techniques do counties use to maintain prairie vegetation on roadsides? {Ans: Counties integrate several different management techniques to maintain a strong, healthy plant community. Techniques include 1) spot spraying perennial weeds, 2) mowing of annual & biennial weeds to