What are they?
Many garden experience aphids problems, or at least some aphid presence. Aphid parasitoids are small wasps that attack aphids (see natural enemy section). There are many different species of aphid parasitoids. Sometimes the relationship is very specific; one species of wasp will only attack one or a few species of aphid. These are called specialist parasitoids. Sometimes one species of wasp will attack many species of aphids. These are called generalist parasitoids.