Which symptom is NOT associated with Beet necrotic yellow vein furovirus?

The correct choice indicates that fruiting body development is not a symptom associated with Beet necrotic yellow vein furovirus. This virus primarily affects plants in ways that relate to their leaves and root systems. Symptoms such as root stunting, pale yellowing of leaves, and leaf wilt are typical indicators of viral infection.

Root stunting occurs because the virus disrupts normal plant growth and nutrient uptake, leading to smaller, underdeveloped root systems. Pale yellowing of leaves is a classic symptom of viral infections in plants, reflecting chlorosis due to the virus’s impact on photosynthetic functions. Leaf wilt also occurs as the virus can interfere with the plant's ability to manage water effectively, leading to a loss of turgor pressure in the leaves.

Fruiting body development, on the other hand, usually pertains to fungal diseases rather than viral infections. Fungi produce fruiting bodies as part of their reproductive cycle, a process that is not associated with the symptoms of viral infections like those caused by Beet necrotic yellow vein furovirus. Thus, the absence of fruiting body development as a symptom is consistent with the behavior and pathology of this virus.