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Pestalotiopsis / Neopestalotiopsis leaf fall has emerged as a major threat to Malaysian, Indonesian, and Thai rubber since around 2017. In Indonesia, it has caused catastrophic latex losses (estimates of 20 to 45% yield reduction in outbreak areas). Symptoms overlap heavily with Corynespora leaf fall, so ground confirmation is essential for species-level diagnosis.

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Cause

  • Neopestalotiopsis cubana and related Pestalotiopsis species
  • High humidity and warm temperatures
  • Continuous rain during refoliation
  • Clonal susceptibility (still being characterized; many clones affected)
  • Cross-border spread from Indonesia and Thailand into Malaysia

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Effect

How to distinguish from CLF:
  • Pestalotiopsis lesions are typically smaller with grey-white centers
  • CLF has larger lesions with fishbone/railway veinal patterns
  • Both cause out-of-season leaf fall; laboratory confirmation is the only certain method

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Satellite signals

Same pattern as CLF: out-of-season NDVI drop and delayed refoliation. Satellite cannot distinguish the two; ground diagnosis required.

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Action

1

Send samples for identification

Contact the Malaysian Rubber Board (MRB) for confirmation. Symptoms mimic CLF; laboratory identification is required. Report to MRB regardless (regulatory tracking).
2

Fungicide options (research ongoing)

Current best options include hexaconazole, propiconazole, and mancozeb on immature trees. Effectiveness is variable; follow current MRB advisories.
3

Reduce tapping intensity

Same principle as CLF: allow refoliation, do not compound stress with over-tapping.
4

Monitor spread

Track new outbreaks; report to MRB to support regional surveillance.
Same as CLF (same satellite signature). Distinguish species by ground diagnosis.