Which of the following is NOT a symptom of Beet curly top geminivirus?

Beet curly top geminivirus is known to affect plants by causing a variety of distinct symptoms primarily related to the leaves and growth patterns. The key symptoms associated with this virus include dwarfing and rolling of upper leaves, yellowing of upper leaves, and twisting of leaves. These symptoms indicate the virus's impact on plant development and photosynthetic efficiency.

The choice identified as not being a symptom, clearing of veins, does not align with the characteristics one would typically observe in plants infected with Beet curly top geminivirus. This symptom is more commonly associated with different viral diseases or specific plant health issues. The visible manifestations of this virus are more focused on the distortion and discoloration of the foliage, rather than changes in vascular structures such as vein clearing.

Understanding the specific symptoms linked to Beet curly top geminivirus assists in accurate diagnosis and informs management strategies for affected crops. Recognizing that vein clearing is not a symptom of this particular virus helps distinguish it from other plant diseases that may present with more complex vascular symptoms.