What's That Bug? does not endorse extermination

pink and green horned caterpillar
June 30, 2010
I took a picture of a large pink and green caterpillar with a single horn that I found in the Carbon County, PA area. It was in a grove of crabapple trees. It was discovered in mid June. Any help on identification would be greatly appreciated.
Carbon County, PA

Possibly nowberry Clearwing Caterpillar

Hi Jessica,
Your caterpillar is a Hornworm in the family Sphingidae.  We are nearly certain your caterpillar is that of a Snowberry Clearwing,
Hemaris diffinis, and we are basing that on a photo posted to BugGuide.

What's That Bug? does not endorse extermination
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