Kauaʻi record · KCA-FUNGI-000006
Impatiens downy mildew
Plasmopara obducens
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About Impatiens downy mildew
Impatiens downy mildew is documented for Kauaʻi or tied to local survey work. Role: Oomycete downy mildew pathogen. Associated habitat or substrate: Impatiens foliage in nurseries, home gardens, botanical parks and landscapes.
Kauaʻi evidence
Plant Disease/PubMed abstract reports Kauaʻi sightings in 2013.
Names and classification
- Scientific name
- Plasmopara obducens
- Common names
- Impatiens downy mildew
- Family
- Peronosporaceae
- Order
- Peronosporales
- Record type
- fungus_like
Kauaʻi occurrence and status
- Kauaʻi occurrence
- Documented on Kauaʻi in 2013 Hawaiian Islands outbreak report
- Origin
- Introduced / horticultural pathogen
- Conservation status
- Horticultural / biosecurity relevance
- Evidence date
- 2026-09-13
- Evidence limits
- Taxonomic caution: oomycete, not true Fungi. Retained because field/pathogen workflows often group downy mildews with fungus-like diseases.
Habitat and ecology
- Habitats
- Impatiens foliage in nurseries, home gardens, botanical parks and landscapes
- Ecological role
- Oomycete downy mildew pathogen
- Food and resource needs
- Oomycete downy mildew pathogen
- Reproduction
- Spore production or clonal/mycelial growth; source-specific details vary
- Shelter
- Impatiens species
- Substrate
- Impatiens species
Threats and conservation
- Threats
- Horticultural disease; not a true fungus but retained in fungus-like pathogen layer
- Conservation actions
- Retain observations with provenance; protect sensitive sites; support specialist review; apply disease hygiene and management protocols when relevant
- Monitoring
- Record substrate, host, microhabitat, date, rainfall/moisture, visible morphology, photos, specimen/voucher status, DNA status, and attendant biota
- Data gaps
- Kauaʻi voucher status, precise taxonomic confirmation, microhabitat, host/substrate specificity, abundance, and seasonal pattern need expansion.
Process and seasonal context
- Seasonal timing
- Often moisture- and substrate-dependent; Kauaʻi timing requires repeated observation
- Seasonal description
- Impatiens downy mildew is documented for Kauaʻi or tied to local survey work. Role: Oomycete downy mildew pathogen. Associated habitat or substrate: Impatiens foliage in nurseries, home gardens, botanical parks and landscapes.