Submodule 8: How Invasive Plants Are Controlled

Other Factors Influencing Weed Control: Climate

The effectiveness of an herbicide can be affected by environment conditions such as:

• Precipitation and relative humidity. Some herbicides are quite soluble in water and will easily wash off.
• Temperature. Volatile herbicides will evaporate more quickly in higher temperatures.
• Wind. High wind can increase volatility and affect the placement of broadcast-applied herbicide.
• Light. Intense sunlight can increase the volatility of some herbicides.

(photo courtesy John Hays)