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[ Tropical Milkweed (Asclepias curassavica) | Posted on August 10, 2019 ]

I read this recently in a local paper. "Tropical milkweed becomes a problem when planted in temperate areas where it does not die back in winter. A protozoan parasite of monarch butterflies (Ophryocystis elektroscirrha or OE for short) can travel with monarchs visiting the plants and become deposited on leaves. When caterpillars hatch and start eating the plant, they ingest the OE. High OE levels in adult monarchs have been linked to lower migration success in the eastern monarch population, as well as reductions in body mass, lifespan, mating success, and flight ability."
I assume this also applies to Southern California.

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