Commodity Fumigation License Practice Exam

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What factors can affect the effective life of a canister?

Air pressure and temperature
Fumigant concentration, humidity, and respiratory rate
Type of pesticide and applicator experience
Environmental conditions and surface area treated

The correct answer is: Fumigant concentration, humidity, and respiratory rate

The effective life of a canister is influenced by fumigant concentration, humidity, and respiratory rate. Fumigant concentration plays a significant role as it determines how much active ingredient is available for effective pest control. As the concentration decreases over time due to usage, the efficacy of the canister diminishes. Humidity also impacts the canister’s performance because moisture can affect the volatility and dispersion of the fumigant. Higher humidity can lead to increased absorption of the fumigant by surfaces, thereby reducing its availability in the air. Respiratory rate is the third critical factor since it influences the inhalation of the fumigant. If the respiratory rate is high, the canister may deplete its contents more quickly as more fumigant is being utilized per minute. In conjunction, these factors directly relate to how long a canister can be effectively used before requiring replacement. Understanding these aspects is essential for ensuring safety and effectiveness in fumigation practices.