Two of my recently planted roses are not doing well. Almost every leaf has gone and the flowers are small and the petals are falling off. The petals have brown edges to them. Roses nearby that I planted a year ago are doing fine and someone said that I have thrips damaging my new roses. I don't think that your roses are doing so poorly because of thrips.
Thrips are tiny black insects longer than they are wide and there are two kinds.
Those that are common on roses are larger than the other kind and are called flower thrips. They hide in the mass of petals and, frankly, I don't think they do any damage that's worth worrying about. The brown edges of the petals are often caused by excessive heat or excessive cold, and I suspect, in this case, it's the excessive cold. If young, tender flowers are nipped by a frost as they come out of the bud, they'll have black edges. On the other hand, we can expect brown or black edges to the petals when the weather gets hot and the tender petals are short of water.