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State of California Department of Pesticide Regulation - page 109 / 132

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Pesticide

Tolerance

Residue

Residue in Percent of Tolerance

A B

1 ppm 2 ppm

1 ppm 2 ppm

100 100

106 • PESTICIDE RESIDUE

Unrelated Pesticide Residue Combination Consider what happens if the residue found on this lot of lettuce had been 1 ppm of pesticide A, an organophosphate, and 2 ppm of pesticide B, a

chlorinated hydrocarbon:

REVIEW QUESTIONS

This time the residue on the lettuce is legal, because unrelated pesticides are not added on a percentage basis. Therefore, 100 percent tolerance of each

compound is legal.

(answers on page 119)

  • 1.

    Which of the following would not generally produce pesticide residues on a treated crop?

    • a.

      direct application of a pesticide to the crop

    • b.

      spray drift from an adjacent area

    • c.

      upta e of pesticides by plant roots from contaminated soil

    • d.

      storage of undiluted pesticides in a loc ed storage shed

  • 2.

    A pesticide residue tolerance is the

    • a.

      minimum amount of pesticide that is allowable on a particular commodity at the time of application

    • b.

      maximum amount of pesticide that is allowable on a particular commodity at the time of application

    • c.

      maximum amount of pesticide that is allowable on a particular commodity at the time of harvest

    • d.

      maximum amount of pesticide that is allowable on a particular commodity at mar et distribution centers, wholesale mar ets, and points-of-entry

  • 3.

    Which agencies are responsible for monitoring pesticide residues on commodities?

    • a.

      the U.S. Environmental Protection Agency and the California Department of Health Services

    • b.

      the U.S. Department of Agriculture and the California Department of Food and Agriculture

    • c.

      county health departments and the California Department of Health Services

    • d.

      the U.S. Food and Drug Administration, the Department of Pesticide Regulation, and county agricultural commissioners

  • 4.

    What is the best way to avoid exceeding the legal pesticide tolerance on a commodity to which you are making a pesticide application?

    • a.

      ma e the application as close as possible to harvest

    • b.

      use adjuvants that retard the brea down of the pesticide

    • c.

      carefully follow label instructions and any laws or regulations that may govern the use of the specific pesticide

    • d.

      ma e applications at night or early mornings

5. If an agricultural commodity is found to carry pesticide residues in excess of the legal tolerance it will be a. banned from sale in certain states b.allowed to be sold only in certified farmers mar ets c. allowed to be sold only outside of the United States d.quarantined and removed from sale and distribution

  • 6.

    If an agricultural commodity is found to have residues of a pesticide that is not registered for that commodity, it will be

    • a.

      sold for livestoc feed only

    • b.

      considered a public nuisance

    • c.

      held in storage until the residues dissipate

    • d.

      allowed to be sold only outside of the United States

  • 7.

    Laboratories that provide pesticide residue analysis must be accredited by the

    • a.

      California Department of Health Services

    • b.

      California Department of Pesticide Regula- tion

    • c.

      California Department of Food and Agricul- ture

    • d.

      U. S. Food and Drug Administration

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