Post by livingplanet3 on May 6, 2021 17:55:14 GMT -8
True that the genus Citrus is not native to the US, but we do have two native species of Zanthoxylum which like Citrus, are also members of the family Rutaceae, and important host plants of P. cresphontes. Zanthoxylum americanum is common in my area, and if the leaves are crushed, they give off a very characteristic citrus odor (not so much like orange or lemon, but more pungent, similar to the smell of limonene).
Papilio cresphontes feeds not only on citrus plants. It is common species here in Ontario and I can insure you citrus doesn't grow here . I don't know what they feed on here in Ontario but it might be some new species of plant or maybe Prickly ash.
Interesting. The Wikipedia map would explain why historically cresphontes was found in the Buffalo area but not Finger Lakes. I suppose with cresphontes now in Finger Lakes it would be good to know the food source.
Post by livingplanet3 on May 7, 2021 9:11:35 GMT -8
There are actually more US species of Zanthoxylum than I'd realized (although only a few are widespread), and judging from these range maps, as well as photos, the species in my area is probably Z. hirsutum.
Z.americanum is indeed what the foodplant is. (Prickly Ash). found in central Florida.
Have found larva on it.
A Story: A number of years I had a call from USDA wanting to inspect my Wampii Tree. I had one in the greenhouse. I was in a hurry and told the agent to go ahead on her own. She had never seen one. I guided her to it and she explained that she was checking all Wampii trees and there was a relationship between Wampii and Citrus disease.
Never had cresphontes on the Wampii . Don"t know if cresphontes is an eater in Wampii groves where ever they are !!!
Post by Adam Cotton on May 11, 2021 13:02:32 GMT -8
The Wampii Tree is Clausena lansium, a SE Asian Rutaceae species. I have several in my garden. Occasionally Papilio memnon will lay an egg on it but it is not a main foodplant for Papilio species here so I am not surprised that P. cresphontes won't eat it.
Adam: I thought I might here from you because of locale of Wampii.
I never saw any predation on Wampii because it never left my greenhouse. We have Wampii groves here in Florida though I've never seen them. But apparently they don "t have an issue with disease that might affect our Citrus.