I would think they should, as insects are often attracted more to color than anything else. For instance, you can coat bright yellow motor oil bottles (Valvoline???) with clear oil or tanglefoot & trap whiteflies.

The fact that the plant is pollenless may DISAPPOINT the insect, so he will be looking for other plants, too. I believe the sunflowers attract the beneficial insects to the area, then they look all around for pollen or nectar.

"Oh, look! Gourds! Let's go!"

Sue