What characteristic is associated with gray leaf spot on corn plants?

Gray leaf spot is a fungal disease primarily affecting corn plants, and it is characterized by pale brown to tan lesions that are typically restricted by the leaf veins. This restriction occurs because the pathogen, which causes gray leaf spot, thrives in the leaf tissue, leading to lesions that take on a rectangular or elongated shape, often following the veins of the leaf.

The specific appearance of these lesions is essential for diagnosing the disease early and accurately, allowing for timely management practices that can mitigate losses. The identification through this characteristic helps differentiate gray leaf spot from other leaf diseases that may have different visual symptoms.

Other options describe features of different plant pathogens or conditions: the circular reddish-brown pustules are indicative of a different fungal issue, while the premature dying of bottom leaves can be associated with other stress factors or diseases, and kernel quality deterioration typically relates to issues affecting the ears and kernels rather than leaf spot diseases. Therefore, understanding the distinctive characteristics of gray leaf spot is crucial for effective monitoring and control within corn cultivation.