C/O: Fusarium oxysporium f.sp. vasinfectum
- 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.
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