How do temperature and humidity affect herbicide effectiveness?

Temperature and humidity play significant roles in the effectiveness of herbicides. Higher temperatures can enhance the efficacy of herbicides by increasing the absorption of the chemical into the plant tissues, as warm temperatures typically promote metabolic activity in plants. Likewise, increased humidity can contribute to more effective herbicide application by reducing evaporation, allowing the herbicide more time to be absorbed by the plant.

When temperature and humidity are both high, the conditions generally support better distribution and penetration of the herbicide, ultimately leading to more effective weed control. These factors help prevent the herbicide from drying on the leaf surface too quickly and allow for proper translocation within the plant, enhancing the overall effect of the application.

Options that suggest a lack of effect or a decrease in effectiveness do not accurately capture the dynamic relationship between these environmental factors and herbicide activity. Therefore, the correct response reflects the positive correlation between increased temperature and humidity with herbicide effectiveness.