Final diagnosis


Secondary growth: deformed and glassy tubers

Pear-shaped potato tuber
Potato tuber with multiple knobs (suckers)
Dumbbell-shaped potato tuber (ridge rollers)
Potato plant showing various expressions of secondary growth phenomenon (chain tuberisation, tuber gemmation, tuber sprouting, ridge rollers, etc.)
Partially glassy potato tuber after boiling
Glassy potato tuber