What is a key symptom of plants treated with Diquat?

Diquat is a non-selective contact herbicide that primarily targets the leaves and stems of plants. Its mode of action quickly disrupts photosynthesis, leading to rapid damage and the inability of the plant to maintain hydration. The key symptom observed in plants treated with Diquat is rapid wilting and desiccation. This occurs because Diquat causes cellular destruction within the plant tissues, effectively "burning" the leaves. The resulting wilting is often accompanied by browning and crisping of the leaves, as the plant loses its ability to retain moisture. This rapid deterioration is what makes Diquat effective for controlling unwanted vegetation, especially in scenarios where immediate desiccation is desired.

In contrast, green leaf production, growth enhancement, and root development are processes that would typically be inhibited by a herbicide like Diquat, which is designed to kill or severely damage the treated plants. Thus, the presence of wilting and desiccation directly correlates with the herbicide's intended effect, making it the key symptom to recognize when diagnosing the impact of Diquat on plants.