Piling leaves in the garden isn't a good idea - you will create a safe haven for every bug and disease within flying distance.
My experience with fabric landscape cloth/weed guard is that the weeds come up through it anyway but are impossible to pull because of the fabric. The new little weed tops are a whole lot smaller than the roots underneath.
I plant new bean hills every two weeks all summer to continue a good harvest. Bean plants wear out fast.
I have used nothing but planting holes for years. I wouldn't do it any other way.
I don't think you can buy Sevin anymore, at least I hope you can't. Anyone who seriously considered Sevin after my comment, I'm sorry I gave you the wrong impression. The only things I use are Neem, insecticidal soap, alcohol and 409.