All greenfly are Aphids but not all Aphids are greenfly.

What are Aphids

• Aphids are sap sucking insects,
• They damage  plants and introduce disease  makinge them enemies of farmers and gardeners alike.
• There are around 4,400 species and that many flies on some of my plants.
• The little black Aphids that trouble Broadbeans or Greenfly on Roses are from the Aphid family.
• Aphids are often specific to one plant species.
• Aphids breed several time in a season if left untreated.
• One female hatched in spring may produce billions of descendants from 40 generations in one year

Read Gardening Products Killing Aphids

Pest control including Aphids