Cattail Growing Season

We have three ponds (they are .9, 1.32 and 1.75 acres), which are
densely populated with cattails. We plan to spend the money to remove
those cattails in the September/October time frame. To keep our costs
down, I'm thinking that we will want to cut them down, but not apply
any herbicide (Rodeo) this year if the cattail growing season is done,
rather wait until Spring of next year.

Does this sound like a good idea, to wait until next year for the use
of herbicides?

The pons are located in southeast Wisconsin.