What temperature is recommended where vegetation kill is needed?

What temperature is recommended where vegetation kill is needed?

• A. Below 50 F
• B. 60-70 F
• C. Above 80 F
• D. 70-75 F

Answer: (C)

When vegetation kill is the goal, warmer conditions are favored because heat transfer into plant tissues works best with higher fire intensity. Air temperatures above 80 F tend to dry fuels, allow longer flames, and deliver a stronger heat pulse to leaves and stems, increasing the likelihood of killing or suppressing the target vegetation. Cooler temperatures—below 50 F or in the 60s and 70s—keep fuels moister and fire intensity lower, making kill less reliable. So the recommended temperature range is above 80 F to maximize effectiveness.

When vegetation kill is the goal, warmer conditions are favored because heat transfer into plant tissues works best with higher fire intensity. Air temperatures above 80 F tend to dry fuels, allow longer flames, and deliver a stronger heat pulse to leaves and stems, increasing the likelihood of killing or suppressing the target vegetation. Cooler temperatures—below 50 F or in the 60s and 70s—keep fuels moister and fire intensity lower, making kill less reliable. So the recommended temperature range is above 80 F to maximize effectiveness.