Potential Exam Questions for Weed Management II.

Warning: The following questions may be poorly worded and subjective.Exam questions will be worded differently.Exams may also contain questions not listed here.


  1.  Name 3 ways in which weeds ‘Interfere’ with crops
  2. What is an “efficient” plant?
  3. Name 3-4 factors upon which efficiency depends
  4. Name some reproductive characteristics that help weeds compete
  5. How might tillage affect weed populations?
  6. Define “allelopathy”
  7. What stages of crop growth are most affected by allelopathic chemicals?
    1. Where are these chemicals usually produced?
    2. How might they effect the plant ecology?

     

  8. What is meant by “Weed Management”?
  9. Define “Weed Control”, “Weed Prevention” and “ Weed Eradication”
  10. How do the short term returns compare between control and prevention?
  11. Name a few weed preventative measures.
  12. Discuss the difficulty in assessing preventative measures
  13. Name 2  possible common causes for weed invasions.
  14. Are most invasive weeds imported or domestic?


  15. Name, define and provide one example of the 4 categories of control measures
  16. Indicate 3 possible causes for the failure of Mechanical control measures
  17. Name the 8 mechanical control measures mentioned in class.
  18. What are the 3 ways in which tillage controls weeds?
  19. Discuss the difference in weed control between a disk plow and a moldboard plow
  20. What type of weeds predominate under no-till
  21. Why might mowing improve herbicide effectiveness in turf?
  22. What is the general effectiveness of mowing in weed control?
  23. Name 2 problems with using fire for weed control?
  24. Describe solar heating for weed control
  25. Give 2 reasons why mulching may control weeds

  26. Name 6 specific Cultural Control techniques
  27. What is the general effect of crops on weed populations?
  28. What is the theory as to why multiple crops in a field can control weeds
  29. How might early planting affect weeds? What about Late planting?
  30. What issues are involved with companion crops as a technique?
  31. Discuss how crop rotation can help in weed management in conjunction with other control measures. You may use examples.


  32. Discuss the general effect of Soil Fertility on weed populations.
  33. Under what specific circumstance would improved soil fertility help control weeds.
  34. What are 3 mechanisms by which crops have resistance to herbicides
  35. Cite 5 potential problems with the use of Herbicide resistant crops.


  36. What is the overall general level of effectiveness for Biological control?
  37. Indicate 4 advantages for using Biological control. Indicate 5 Disadvantages.
  38. Why is it easier to use Biological control techniques on introduced weeds?
    1. Give 4 reasons why it might not work
    2. Name two other steps that should be followed
  39. Name and indicate a use for the 4 techniques for Biological Control.
  40. Indicate agents used for Classic, Augmentation and Broad Spectrum techniques.


  41. When did the use of herbicides which could selectively kill weeds begin?
  42. How has the relative use of Animal power, Human power, Mechanical power and Chemicals changed over the years and WHY?
  43. Name 4 specific advantages to the use of chemicals. Name 4 Disadvantages.
  44. In terms of energy used. How do herbicides and hand weeding compare? What about in terms of costs (Profit)
  45. Why is herbicide resistance in weeds less likely than resistance to insecticides? ( 4 reasons)
  46. Give a number of ways that resistance be prevented?
  47. Name 7 ways that herbicides are often classified?
  48. How are they classified in terms of time of application?
  49. Name the 6 modes of activity that most herbicides might have.
  50. In what 3 ways might Light dependent activity work?
  51. When are cell growth Inhibitors most effective?
  52. In general, how do Auxin-like growth regulators disrupt the plant?
    1. Name 1 such herbicide.
  53. What is the primary issue with herbicide application?
  54. What are the 3 usual causes or types of Drift?
  55. Rank the herbicide formulations by their Volatilization potential
  56. What are the 5 determinants of herbicide leaching?