Pacific Pests, Pathogens & Weeds - Mini Fact Sheet Edition

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Jackfruit Rhizopus rot (324)

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Photo 1. Rots developing on a young jackfruit fruit caused by Rhizopus stolonifer.

Photo 2. Spores forming on a young jackfruit fruit infected by Rhizopus stolonifer.

Photo 3. Late-stage infection of jackfruit fruit by Rhizopus stolonifer, showing the groups of spores (sporangia) on long stalks (sporangiophores).

Photo 4. Black spore masses on top of long stalks (sporangiophores) of Rhizopus stolonifer.

Summary

• Worldwide distribution. In soil, and on many hosts. Minor disease of jackfruit, whereas soft fruit and vegetables infected through wounds. In field, rots during long, wet weather; in storage, rots when temperatures and humidty high.
• On flowers and young fruits. On mature fruits, soft, watery, brown spots covered in grey-brown, later black, furry mould. Fruit symptoms occur on tree and in storage.
• Spread by spores in air; thick-walled spores for survival in soil, on plant debris, on seed.
• Cultural control: prune to encourage air flow; remove infected fruits from trees, and ground; harvest and transport carefully; avoid storage at high humidity; if possible, store <10°C; clean packing shed, and use clean bins.
• Chemical control: use mancozeb, benzimidazole, or triazole. To improve storage, apply 10-day pre-harvest spray.

Common Name

Jackfruit Rhizopus fruit rot

Scientific Name

Rhizopus stolonifer; previous names are Mucor stolifer, Rhizopus artocarpi, Rhizopus nigricans.

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