C/O: Fusarium oxysporium f.sp. vasinfectum

Symptoms:

• Disease starts at the age of 1-3 weeks.
• Yellowing and browning of the cotyledons.
• Leaves lose their turgidity.
• First turn yellow and then brown and finally drop off.
• The tap root ceased to grow, and less no. of lateral roots emerged.
• Browning and blackening of vascular tissues.
• Discolorations of leaves starts from the margins and spread towards midribs.
• Wilting may be complete(tap root infection) or partial (lateral root infection).
• Young plants lower part becomes black whereas partial discoloration is observed in case of mature plants.
• The plugged xylem vessels of blackish color is observed under examination.
• The vascular bundles with fungal hyphae and gummy substances can be observed with transverse section cut.