Color Problems: Part 2

So here is the original image. Again, the luminance histogram (the black-and-white one) tells me that the exposure is just fine. Experience tells me, however, that red is n easy color to overexpose, and I check the RGB histogram. Imagine my (lack of) surprise when it shows me that the red channel is way blown out!

I take my first exposure based on the luminance histogram, and you can see above the areas of red next to and in front of the Japanese beetle that have no detail whatsoever.