CDFA Pest Prevention Plant Regulation Practice Exam

What temperature and duration is required for an effective dosage of methyl bromide for citrus white flies?

1. 60 degrees F for 2 hours

2. 80 degrees F for 3 hours

3. 60 degrees F for 3 hours

4. 75 degrees F for 2 hours

The correct answer is: 60 degrees F for 2 hours

The effective dosage of methyl bromide for controlling citrus white flies relies on specific temperature and duration parameters to ensure optimal pest eradication. The chosen option indicates that at a temperature of 60 degrees Fahrenheit for a duration of 2 hours, the application of methyl bromide can achieve the required efficacy. Methyl bromide functions as a fumigant, and its effectiveness is significantly influenced by temperature. At lower temperatures, the gas may not properly disperse or penetrate the area where pests reside, potentially leading to inadequate control. Setting the standard at 60 degrees Fahrenheit reflects a balance where the gas is sufficiently active, and the duration allows for adequate exposure for the pests, ensuring mortality rates reach the desired level. In contrast, options that suggest higher temperatures or longer durations may either not align with the optimal conditions needed for effective application or could deviate from established research or guidelines on methyl bromide use for citrus white flies. Therefore, the selection of 60 degrees F for 2 hours is consistent with the requirements for achieving effective pest management while considering the unique characteristics of the fumigant and the target pest.