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Bakanae (“foolish seedling”) disease, caused by Fusarium fujikuroi, is seed-borne. Infected seedlings grow abnormally tall and thin due to gibberellin produced by the fungus. Most die before heading; survivors produce empty or partially filled panicles. It is a major problem in direct-seeded systems and where seed is saved without treatment.

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When rice is most vulnerable

Seedling and early tillering. Once infection is established through the seed, in-season control options are very limited.

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How bakanae shows in satellite data

  • Uneven early establishment with taller-than-normal plants scattered across the field - visible as increased canopy roughness rather than an NDVI drop.
  • Affected plants eventually die and thin the stand, dropping NDVI in the affected zones by mid-season.
  • No reliable early satellite detection; nursery inspection is the primary control point.
Bakanae is best caught in the nursery, before transplanting. Once symptomatic plants are transplanted, in-field control is not effective - focus on next season’s seed.

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Field symptoms

  • Seedlings and young plants are abnormally tall, pale, and thin, standing out above the rest of the crop
  • Yellow-green, chlorotic leaves that dry and die from the tip
  • Fewer tillers than healthy neighbors
  • Adventitious roots on lower nodes
  • Most affected plants die before heading; survivors produce empty or sterile panicles

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Reduce the damage by

  • Use clean, treated seed - the primary control. Hot water treatment (54 C for 10 minutes) or fungicide seed treatment (carbendazim, tebuconazole, or thiram) breaks the primary cycle.
  • Do not save seed from infected fields.
  • Discard tall, off-color seedlings in the nursery before transplanting.
  • Grow moderately resistant cultivars where the disease is chronic.
  • Sanitation - remove and burn infected plants and residues; the fungus survives on crop residues.

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Set an alert for early warning

Turn the diagnosis into a trigger. Bakanae control is a seed-treatment reminder, not an alert to fire when NDVI drops.
Recommended settings for bakanae on rice:
  • Calendar reminder - schedule a pre-sowing seed-treatment task; do not rely on imagery to catch this disease in time.
  • Nursery-stage inspection alert - a field-note reminder to inspect seedlings 10 days before transplanting.