What are common symptoms of lettuce mosaic potyvirus?

The symptoms associated with lettuce mosaic potyvirus primarily include stunted and deformed leaves. This viral infection disrupts the plant's growth processes, leading to noticeable distortions in leaf structure and overall stunting. Infected plants may exhibit leaves that are not only smaller than normal but can also appear crinkled or curled, which can be directly attributed to the effects of the virus on the plant's ability to synthesize proteins and grow effectively.

In contrast, while yellowing of leaves and wilting, brown spots, and pale green stems might be symptoms associated with other plant disorders or diseases, they are not characteristic of lettuce mosaic potyvirus. The primary identifiers of this viral disease would focus on the stunted growth and leaf deformities, making the correct option clear in relation to the specific impact of the lettuce mosaic potyvirus on affected plants.