{"id":2183,"date":"2013-10-26T21:48:37","date_gmt":"2013-10-27T01:48:37","guid":{"rendered":"http:\/\/naturalcrooks.com\/rambles\/?p=2183"},"modified":"2025-06-14T16:12:10","modified_gmt":"2025-06-14T20:12:10","slug":"what-yellow-beetle-12-black-spots","status":"publish","type":"post","link":"https:\/\/naturalcrooks.com\/rambles\/what-yellow-beetle-12-black-spots\/","title":{"rendered":"What is This Yellow Beetle with 12 (or 11?) Black Oblong Spots Foraging on the Goldenrod?"},"content":{"rendered":"

While walking in the Rattray Marsh in October, I noticed that many of the insects were gathering pollen, or possibly nectar, from the goldenrod blossoms. There were also predators hunting there including lady beetles. While taking photos of a ladybug, I was surprised to see another beetle on the same flowerhead. This beetle was a shiny yellow green colour with 12 large black spots and long black antennae\u2014but what kind was it?<\/p>\n

\"Photo<\/a><\/p>\n

A Bit of a Pickling Problem<\/h2>\n

This was the same day that I took photos of a plant that was sporting dried spiny cucumber-like seed pods. So I had wild cucumbers on my brain when I started looking up the beetle. Just for fun, I entered \u201ccucumber beetle\u201d in my web search engine.<\/p>\n

Imagine my surprise when up popped a photo of my insect! There are two varieties of the Spotted Cucumber Beetle: one with 12 spots and one with 11.<\/p>\n

\"Photo<\/a><\/p>\n

Spotted Cucumber Beetles Eat Everything<\/h2>\n

While reading up on my discovery, I found out that Spotted Cucumber Beetles are a major pest to farmers. While in their larval stage the eat plant roots. In fact another common name for this insect, according to BugGuide.net<\/strong><\/a> is Corn Rootworm.<\/p>\n

Unlike some pests, they are native and they are found throughout North America, again according to BugGuide.net.<\/p>\n

The damage is not limited to the larval stage. As adults, Spotted Cucumber Beetles keep eating. They munch on leaves and flowers including home garden plants, according to the Texas A&M University website<\/strong>.<\/p>\n

Once You Find One, You See Them Everywhere<\/h2>\n

Of course after seeing my first one at the Rattray, I then started seeing them everywhere.<\/p>\n

I think the eye learns to find what you want it to. I\u2019ve found when looking for Green Frogs in the swamp, spotting the first frog takes a few minutes. Then, once your eye understands what you\u2019re looking for, you start to see them all over, under rushes, beside stumps, floating in the water, peeking out between the arrowhead leaves.<\/p>\n

For instance, I saw another one at Riverwood Conservancy in Mississauga later that week.<\/p>\n

Let\u2019s hope the next one I see isn\u2019t on our roses!<\/p>\n

Related Reading<\/strong><\/p>\n