Rich Johnson (2009-09-26)
I live in Phoenix, AZ and have a Butterfly Bush that is absolutely riddled with the caterpillar. Is there cause for concern. Nobody that has seen them can say that they have ever seen them here before.
gary anweiler (2009-09-27)
Hi Rich
It appears highly unlikely that the caterpillars on your butterfly bush are this species, as it is an eastern species not known to occur in AZ. Furthermore it feeds mainly on woody trees such as Ash and Lilac.
What you may have is larvae of a related species, the White-lined Sphinx, which can and does occur in large outbreaks in the SW, but the larvae look quite different.
Sorry I cannot be of more help !!.
Gary Anweiler
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