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Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

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Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

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Friday - July 17, 2009

From: Jacksonville, FL
Region: Southeast
Topic: Butterfly Gardens
Title: What would replace non-native orange tree leaves in butterfly hatchery?
Answered by: Barbara Medford

QUESTION:

I have a very small orange tree that currently has dozens of caterpillars on it that look like bird droppings. I think I have narrowed them down to a swallowtail butterfly. I would love to let them mature but do not want to risk my orange tree that is just now starting to make a come back from last years invasion. So my question is. Is there any other leaves that the caterpillars would eat if I were to keep them in some sort of a butterfly hatchery? Thank you for your time.

ANSWER:

If the Citrus sinensis were native to North America, we would direct you to the webpage for that plant, where we frequently have the names and pictures of butterflies that feed on a particular plant. However, the Lady Bird Johnson Wildflower Center is dedicated to the care and protection of plants native not only to North America but to the area in which the plant is being raised. The orange originated in Southeast Asia, and has been heavily hybridized. Ordinarily, butterflies and moths prefer to feed on and use for larval hosts plants native to the same area that the butterfly is. Possibly the caterpillar you are seeing was imported with the plant; even though the orange tree was probably cultivated commercially in North America, it still may be sheltering a non-native butterfly through generations.

Since we are not entomologists and since we have no information on the orange tree in our database, let us refer you to the website of Butterfly and Moths of North America, also referred to as BAMONA.  The information on our native plant webpages originates with this organization, and they have many ways of helping you research the larval form you have found on your orange tree.

And, finally, here's another little snippet of information and pictures that we ran across that may or may not be germane to your question. It is from a website called Bug Guide, and has pictures of the Papilio cresphontes, Great Swallowtail, larva on an orange leaf.  

 

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