The Checkered Beetle and the Painful Plant

by Marian Buegeler and Sue Ann Kendall

This month’s iNaturalist observation of the month was this beautiful image of a checkered beetle (Trichodes bibalteatus), photographed by Marian Buegeler of our 2020 class.

Marian reports:

[It] is sitting on a vine that iNat identified as sorrelvine (Cissus trifoliata). It is a beautiful vine that grows like crazy all over the family farm. 

I have always referred to this vine as poison ivy, because anytime I come in contact with it I break out in a nasty rash that gets identified at the docs office as poison ivy/poison oak.  

The flowers.

Sue Ann adds: The iNaturalist entry says that sorrelvine is a member of the grape family, and native to the US. It’s very common in this area (Sue Ann’s family lives nearby and reports they have it on their property, too, and it causes allergic reactions as well, though maybe because it’s near actual poison ivy).

From Marian: Here are three more pictures of insects on the sorrelvine.

Another beautiful beetle on this vine.
It must be delicious.

I put these on iNat and they have been identified as Grapevine Beetle (Pelidnota punctuate), Delta Flower Scarab (Trigonopeltastes delta), and Bumelia Borer (Plinthocoelium suaveolen). Although, only the Bumelia Borer has reached research grade status.

This is definitely a scarab.

I have also seen lots of wasps and grasshoppers enjoying a meal at this vine. It certainly seems to be the place to eat! I just wish I wasn’t allergic to it.

Do any of you readers have more experience with this vine?