HI All, my roses are already starting to sprout new leaves and stems. Yesterday I noticed that on a Mirandy with new red foliage, there are already aphids all over. I mean there are a TON of aphids. I can control them fine with my dish soap spray, but I am shocked because our nights are still below freezing here. Usually around 28 degrees F. I thought these things were not supposed to live below 50 degrees! Does anyone know what temperature kills these pests?