Ladies and Gentleman…The Beetles!

No, this isn’t the Ed Sullivan Show and I’m not introducing Liverpool’s most famous rock ‘n’ roll jet setters (wrong spelling anyway). I’m not even talking about the Volkswagen, which, incidentally, I heard a while back might be retiring our lovable Herbie. No…I’m talking about the tiny little members of the Order of Coleoptera that decided to make a perplexing appearance in our pollinator garden this spring.

Just before I left for spring break vacation in Orlando, J. and I noticed a plant variety coming up in various areas of the pollinator garden that we didn’t recognize from last year. This isn’t too surprising, though. We scattered a few wildflower mixture packets in the spring of 2017, and some of those seeds need a nice cold winter to harden over before they actually germinate. Nonetheless, there was much debate over the identity of our new friends, solely based on leaf structure. Before we left for the spring break week, our thriving little plants looked like this…


When we came back, they looked like this…


Every…last…one of them.

The picture above doesn’t do it justice. At least that plant still had some leaves. Some of the others literally looked like green sticks. It was a sunny day, and, as I puzzlingly peered downward, something beautifully golden shimmered beneath the sun’s spring rays. I happened to have the macro lens on my camera and zoomed in. You know that phrase, “All that glitters is not gold?” Yeah. There’s a measure of truth to that. There they were, just feasting away on the tender, green goodness of our newfound friends. These guys…


So now we had a double quandary on our hands. Not only did we not know for sure what plant species we were looking at, but we had NO idea what kind of beetle this was. I can’t tell you the hundreds upon hundreds of insect photos that I have from our first year in the pollinator business, but I KNEW that I had NEVER documented this beetle before.

This is where I diverge from the average gardener. Most would feel an alarming sense of urgency to undertake eradication. The pirates…may they plunder no more! But this is where I, the consummate student and researcher, come in. My first thought is to ask, “Why is this happening?” Then I use words within my brain like “observe” and “study.” Then I tell myself to look beyond what is right in front of my nose to see if anything else about the remaining surroundings is of interest. And then, of course, like every other good human, I turn to Google®. I’ve logged insects for about a year now. I’m getting pretty good at keyword descriptive searching, so it wasn’t long before I came up with several articles on Phaedon desotonis, or, what we can all more lovingly call:  the Coreopsis Beetle.

Well, that killed two birds with one stone. When you know the insect, then nine times out of ten you can research its host plants and narrow down to the plant that you have. Coreopsis would definitely have been an indentification option for these plants. It all made sense once the devouring culprit was named. Through my research I learned that wild Coreopsis is the state flower of Florida, and these beetles have been a NIGHTmare for them. That’s when I also discovered, unbelievably, a 2012 article by Mike Merchant with Texas A&M Agrilife Extension on the very subject of this beetle beginning to pop up in Texas. I say “unbelievably,” because Mike happened to be the instructor on entomology for my Master Gardener’s certification coursework. In that same search, I also stumbled across a post by the Texas Invasive Species Institute (TISI) calling for residents to report any establishment of the species in Texas. So, I reached out to both Mike Merchant and TISI to report my findings.

You’ll see in Mike’s article that he ended up doing an update with some of my information. My TISI contact requested that I collect some of the beetles to send in for identification. When I asked how they wanted them collected, I was told to use a water tight container filled with ethanol, like “vodka, rum or everclear.” Yikes! We had just enough Tito’s left to do the trick. Sorry Tito’s. I definitely would have preferred you in a nice Saturday Bloody Mary. 😉

Of additional interest was the fact that we had two other varieties of Coreopsis, that we already knew about from the previous year, that the beetles didn’t seem to have as much of an interest in. Or, maybe, when given the choice between several varieties, they just preferred one over the other two. Kind-of like if you give a kid the choice of broccoli, a bowl of strawberries or chocolate ice cream…he might be willing to eat all three, but he’s going to go for the chocolate ice cream first. And if his stomach fills up on chocolate ice cream, he likely won’t have room for strawberries and broccoli.

So, I collected a dozen or so beetles and then just watched the garden to see what happened. I’ve had enough experience to know that if you sometimes just let something run its course, the plants can come back and thrive. As long as enough green is left to keep photosynthesis going, nature keeps pushing them forward. That is exactly what happened in our garden. The beetles ran their course, and the plants continued to put out more leaves.

Fast forward to today…

I waited and waited to see the chocolate ice cream once it bloomed, so that I could include that in my findings to TISI.  It ended up being a Coreopsis variety that is more often referred to as “Tickseed,” although you might hear some people call any Coreopsis a “Tickseed.” Now I had the images of all three varieties in bloom, especially noting the one the beetles absolutely loved.

Mouse-eared Coreopsis (named so because of the shape of its leaves) [The “broccoli”…beetles had zero interest in this]


Nana Coreopsis (big blooms, tallest of the three varieties) [The “strawberries”…beetles had a very slight interest in this]


Tickseed Coreopsis (this variety starts with clusters of tiny buds that bloom much smaller flowers than the other two) [The “chocolate ice cream”…the beetles couldn’t get enough of this]


So, my beetles and my data are headed to TISI for evaluation. We’ll see what the “official” findings are. I chose to write this post because, as I’ve now completed the coursework and final exam for my Dallas County Master Gardener’s certification, I learned that a vast majority of questions that come in from the public involve, “What is wrong with my (fill in the blank)?” In the event that you one day stand scratching your head in dismay saying, “What is wrong with my Coreopsis???” as it devolves from lovely green seedlings to sticks, may you remember to peer down and hunt for a little shimmer of gold…and then hit the Tito’s.


All the best,

A. J.



One thought on “Ladies and Gentleman…The Beetles!

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  1. Another great post and a wonderful reminder to always be a student and be willing to learn new things. Love the pictures of the blooming plants.

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