Natural Origin - Peronospora is very common and is an obligate parasite on leaves, stems, flowers and fruits of living higher plants. The spores may also be seen in dust as part of the normal influx of outdoor microbial particles.

Indoor Origin - Occasionally found in rotting wood, cellulose based materials, or plants.

Pathoginicity - No information is available regarding health effects or toxicity.

Diseases - Unknown at this time.

Allergen - Allergenicity has not been studied.

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