Which factor could contribute to the failure of herbicides?

The maturity of the weed is a significant factor that can contribute to the failure of herbicides. As weeds mature, they often develop thicker cuticles and a more robust structure, making them more resistant to the absorption and efficacy of herbicides. Mature weeds may have also established a greater root system, allowing them to better withstand chemical treatments and recover more effectively from herbicide application.

In contrast, younger, less developed weeds are generally more susceptible to herbicides because they are still actively growing and have not yet built up the defenses that come with maturity. Hence, targeting weeds at the right stage of life is crucial for ensuring the effectiveness of herbicidal treatments. This factor emphasizes the importance of timing and understanding weed life cycles in integrated pest management practices.