Posted by: lizhamillscott | April 7, 2009

Butterfly Boom!

It seems we have population explosion of West Coast Ladies (or possibly Painted Ladies, but I think they’re the West Coast variant) in the South Bay/Peninsula area. Maybe beyond? Has anyone in the City, the East Bay, or beyond seen more of these charming little 2-3 inch brown-and-orage butterflies than usual?

Here in San Jose, it’s not that the Lady Butterflies are taking over. We don’t see huge clouds of orange-and-brown the way the sulphur butterflies swarm along I-5 in August. But I see them daily in groups of 2 or more, when usually Ladies appear solo. This spring they’re fluttering through the intersections of major roads, which is not normal behavior either.

I haven’t been able to find any information online about the West Coast Lady population boom. So what caused it? An abundance of caterpillar food plants? A dearth of predators? Especially good climate conditions for the most recent brood?

I’d love comments on this one, particularly for my entomologically inclined readers!



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