Ok now - I've got it. Yippee! Got all the bugs

I carried on breeding orchids and a blazing orchid had just bloomed. I'd also planted some lilia fanleaves, and mutated one into a bacchatus fanleaf. I have no idea what made the difference...maybe you need to have a variety of flowers on the orchid foliage, or maybe it's the bacchatus flower which attracts this beetle?