Commodity Fumigation License Practice Exam

When sorption is high, what is typically required?

1. A higher rate of fumigant

2. A lower rate of fumigant

3. No additional fumigant

4. More ventilation

The correct answer is: A higher rate of fumigant

When sorption is high, it means that the material (such as grains or other commodities) is absorbing or retaining more of the fumigant within its structure. In this situation, to achieve effective pest control, a higher rate of fumigant is typically required. This compensates for the amount of fumigant that is being absorbed, ensuring that enough active ingredient remains available in the atmosphere of the sealed space to effectively eradicate the targeted pests. The necessity for increased fumigant rates in high sorption scenarios stems from the challenge in maintaining adequate concentrations of the fumigant within the treatment area. The higher the sorption, the more fumigant is bound and thus less is available to exert its efficacy on pests. Therefore, to overcome the effects of sorption and ensure proper dosage levels are reached, an increase in the fumigant application is essential. In contrast, a lower rate would lead to insufficient levels of fumigant in the atmosphere, compromising its effectiveness. Similarly, no additional fumigant or more ventilation would not address the high absorption and could further diminish control efficacy.