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If your climate is humid, you probably don't have spider mites. They love a hot, dry climate.
There are many, many species of aphids. Some have wings; they can be different colors, etc.
I just wash them off with plain water for my roses. I don't bother to purchase an insecticide. However, I've been told by another NGA member, that sometimes, they move too fast to be just washed off with water. Guess it depends on the bug.
Aphids usually go for new growth.
If you don't use an insecticide, the predators will show up. The aphid population does have to build up enough so that the good bugs won't starve, so putting up with a little damage isn't all that bad.
That's my point of view. Others go for the bug spray right away.