Which of the following nematodes does not enter the root to feed?

The corn needle nematode is distinct among the listed nematodes because it does not enter the roots to feed. Instead, it is known for its method of feeding on the plant through the leaf tissue, particularly at the base of the stalks. This feeding behavior can lead to various symptoms, including stunted growth and weakened plants, but all occur above ground rather than through root invasion.

The other nematodes mentioned typically infect the roots; for instance, the root lesion nematode and the soybean cyst nematode penetrate the roots to extract nutrients, causing damage directly to the root structure. The lesion nematode, similar to the root lesion nematode, also enters roots to feed. The feeding habits and life cycles of these nematodes differ significantly, highlighting the unique behavior of the corn needle nematode.