• Comparative Histopathology of Banana Root Lesions:
• Helicotylenchus multicinctus (Spiral nematode): Semi-endoparasitic feeder that invades only the superficial layers of the root cortex, creating small, discrete, shallow necrotic spots ($\lt 2-3\text{ mm}$ deep).
• Radopholus similis (Burrowing nematode): Extensive migratory endoparasite that creates massive, continuous, deep reddish-brown to black necrotic cavities penetrating through the entire cortex to the stele, destroying structural support.
• Diagnostic Distinction: Lesions differ fundamentally in their size and depth within root tissues (Option 2).

Correct option: (2) Size and depth