Comments for
green caterpillar with sharp tail (Ash sphinx moth caterpillar )

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Ash sphinx moth caterpillar
by: Moni

Bill
Your larvae is a hornworm which is in the Sphingid family of moths. The photos are not clear enough for a positive ID, but the ash sphinx moth caterpillar has a blue tail, so I think that is what you have.

This caterpillar is in the same genus as the tomato and tobacco hornworms but are NOT considered pests. This one eats some leaves on ash trees but do not cause damage to the tree. The moths feed on flower nectar. They are found in eastern US as far west as Missouri.
This site shows pics of the moth as well as caterpillars - http://bugguide.net/node/view/3772/bgimage

Hornworms are Pests
by: Anonymous

If they have little white cocoons on their backs, leave them be, these are the larva of parasitic wasps that kill both the hornworms and the resulting moths.

Green Caterpillar
by: Anonymous

This is either a tomato or a tobacco hornworm-probably tomato. They turn into large moths called Sphinx Moths. Both are terrible pests in the garden.

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