Iowa Herbicide Right of Way - Category 6 All Answers Correct

Iowa Herbicide Right of Way - Category 6 All Answers Correct in early spring when sod has greened ️Growth regulator application is most effective when applied: A. in early spring when sod has greened B. in late spring when sod has grown at least 2" C. after 3 times mowing D. in fall just prior to leaf fall Both B and C ️Which procedures will help reduce herbicide drift? A. Increasing spray pressure B. Reducing spray pressure C. Hanging nozzles to a type which emits larger droplets D. Reducing height of boom E. Both B and C They do not damage grasses ️Phenoxy herbicides are widely used along roadsides because: A. They are effective on a wide variety of broadleaf and woody species B. They rarely damage plants in adjacent areas C. They are high in human toxicity D. They do not damage grasses E. Both A and D Dichlobenil ️Which of the following nonselective herbicides has the longest period of control, when used at a given site: A. Bromacil B. Dichlobenil C. Prometon D. Tebuthiuron During early flowering ️When is the best time to treat many perennials developing from an established root system? Outside an area equal to twice the height of the desirable trees ️In order to avoid injury to nearby desirable trees; persistent, nonselective herbicides such as Hyvar should be applied: A. Only in the fall B. Outside the drip line of the desirable trees C. At least 10 feet from the desirable trees D. Outside an area equal to twice the height of the desirable trees E. A minimum of 1/2 mile from the desirable trees The bark prevents penetration of the herbicide and reduces effectiveness ️Basal bark treatment is not recommended for wood species larger than 6" in diameter because: A. The bark prevents penetration of the herbicide and reduces effectiveness B. The cost is prohibitive C. There is a high risk of drift D. None of the above They can damage desirable plants at very low rates, making them susceptible to drift damage ️A major disadvantage of the phenoxy-herbicides is: A. They are non-selective herbicides B. They can damage desirable plants at very low rates, making them susceptible to drift damage C. They are highly toxic to wildlife D. They persist in the soil for several years Little effect is seen the year of application ️Krenite is different from most brush herbicides because: A. It can be applied either to the foliage or the soil B. Little effect is seen the year of application C. Both A and B D. None of the above Wettable powders ️Which of the following formulations do not dissolve in water? A. Wettable powders B. Soluble powders C. Emulsifiable concentrate D. All of the above dissolve in water 10 ️Herbicide spraying can be performed, as a general rule, until wind speed exceeds ___ miles per hour. Leaching ️The downward movements of pesticides in the soil is called _____. Perennial ️Which type of weed is best controlled in early bloom? A. Annual B. Biennial C. Perennial D. Herbaceous All of the above ️Pesticides may move from the target area and damage the environment by: A. Drift B. Soil runoff or soil erosion C. Leaching through the soil D. All of the above Possible throughout the year ️Basal bark applications are: