What's That Bug? does not endorse extermination

Subject:  Cloudless Sulphur Caterpillar in Mount Washington
Location:  Mount Washington, Los Angeles, California
February 28, 2016
We were shocked to see this bright yellow caterpillar meandering across the patio.  We immediately recognized a Cloudless Sulphur Caterpillar,
Phoebis sennae, but we do not have any Cassia growing anywhere near.  Where did it come from?  We checked BugGuide and learned:  “Caterpillar: usually pale green and marked by a yellow stripe on each side and black spots in rows across each abdominal segment.  Above and below the yellow stripe there are usually small areas marked with blue.   There is also a yellow form that occurs when it feeds on yellow flowers of its host plants. The later instars of the yellow form have a dark transverse band across each segment” which means our Caterpillar was feeding on yellow blooms.  According to BugGuide:  “Caterpillar feeds most commonly on Cassia and some other woody and herbaceous legumes” and we do have an Acacia in the garden, another legume in the family Fabaceae , so we will check it out to see if there are any additional Cloudless Sulphur Caterpillars feeding upon it.

Cloudless Sulphur Caterpillar

Cloudless Sulphur Caterpillar

Cloudless Sulphur Caterpillar

Cloudless Sulphur Caterpillar

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What's That Bug? does not endorse extermination
Location: Mount Washington, Los Angeles, California

2 Responses to Cloudless Sulphur Caterpillar

  1. louise says:

    We found a whole group of the cloudless sulphur caterpillar on our small cassia plant that we bought in Palm Springs a few years ago.

    We are wondering what it will look like as a butterfly. I guess we will look up the same name but in a butterfly. Oh, yes are they a harm to our plant because we would hate to have to relocate them. Also, will they cocoon on the Cassia or move to a more private area?

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