What is the characteristic leaf appearance due to S-Metolachlor in corn?

The characteristic leaf appearance due to S-Metolachlor in corn is short, twisted, and dark green leaves. S-Metolachlor is a pre-emergent herbicide that inhibits cell division in weed plants. When corn is exposed to this herbicide, it can disrupt the normal growth patterns, resulting in a distinct appearance. The leaves may appear shorter than normal and may become twisted due to improper cell division and elongation, along with an intense dark green coloration that typically occurs because of stress or altered growth patterns.

The other options reflect different types of damage or symptoms that are associated with other herbicides or plant stressors rather than specifically with S-Metolachlor. For instance, mottled and chlorotic leaves or blistering would indicate different physiological issues, typically related to other environmental or chemical factors. Yellowing at the leaf tips is also a sign of nutrient deficiencies or stress not specifically linked to the effects caused by S-Metolachlor. These distinctions are helpful for properly diagnosing plant health issues in corn and determining the right course of action for management or treatment.