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Authors: Kathleen Merrigan, Ph.D., William Lockeretz, Ph.D.

NUTR 241B SAMPLE QUIZ 2PLANT PEST INTERACTION

  1. The following are made-up toxicity data for three imaginary pesticides.

  2. What is a likely way that these data are expressed? (For example, if the data were labeled “World average grain yield” a possible answer would be “kg of grain per harvested hectare”.)

    Acute toxicity (LD50)

    Insect - Pest

    Insect - Beneficial

    Mammal

    Pesticide A

    2

    8

    40

    Pesticide B

    5

    15

    30

    Pesticide C

    20

    10

    100

    1. Which pesticide is most selective against the pest compared with the mammal? How do you know?

    2. Which pesticide is the most toxic to the beneficial? How do you know?

    3. If you wanted to control this pest with an insecticide but were particularly concerned about not harming the beneficial, which would you choose? Explain briefly.

  3. Give two major categories of mechanisms by which some individual insects are resistant to an insecticide that is toxic to the species.

  4. What is a pesticide tolerance?

    1. Under what law are tolerances set?

    2. If I wanted to know the tolerance for pesticide X, where would I look it up?

  5. Why is FIFRA considered a “balancing statute”?

    1. What is a section 18 registration?

    2. Provide three major changes in pesticide law brought about under the 1996 Food Quality Protection Act