CDFA Pest Prevention Plant Regulation Practice Exam

What is the approved dosage of methyl bromide for citrus white fly hosts at atmospheric pressure?

1. 1# per 1000 cu ft at 60 degrees F for 2 hours

2. 2-1/2# per 1000 cu ft at 80 degrees F for 2 hours

3. 2-1/2# per 1000 cu ft at 60 degrees F for 3 hours

4. 1# per 1000 cu ft at 80 degrees F for 2 hours

The correct answer is: 2-1/2# per 1000 cu ft at 60 degrees F for 3 hours

The correct dosage of methyl bromide for citrus white fly hosts is accurately represented by the choice that specifies a dosage of 2-1/2 pounds per 1000 cubic feet at 60 degrees Fahrenheit for a duration of 3 hours. This dosage is derived from established regulations and guidelines that dictate both the thermal conditions and time of exposure needed for effective treatment. Methyl bromide is a colorless gas that has historically been used as a fumigant for various pests, including the citrus white fly. The temperature and duration of exposure are critical factors that influence the effectiveness of this treatment. At lower temperatures, the efficacy of the gas is reduced, necessitating a longer exposure period to ensure that the pest population is adequately controlled. Thus, 60 degrees Fahrenheit and 3 hours is a recognized standard for this particular pest host interaction. When considering the other options, they either provide inadequate exposure times or temperatures that do not match the optimal conditions for effective pest elimination. The selected dosage not only adheres to best practices for pest management but also aligns with guidelines that ensure the safety and efficacy of the fumigation process.