Aphids reproduce at an extremely fast pace, causing populations to quickly get out of hand if not properly treated.
Most aphid predators take days or weeks to reduce aphid populations, which all happens while aphids continue to reproduce. This makes existing aphid issues difficult to handle. Waiting too long will cause the aphids to get out of control. That is why preventative actions are recommended. Release aphid predators at the first site of damage.
So what works best for Aphid control?...
"Host specific" species, such as Aphidius colemani, only attack a few species of aphids. However, predators such as Green Lacewing larvae, Aphelinus abdominalis, Aphidoletes aphidimyza, and Ladybugs have a much broader host range, feeding on dozens of different aphid species.
Ladybugs: Aphids, Mealybugs, Mites, Whiteflies, etc.
Lacewing Larvae: Aphids, Mealybugs, Thrips, Spider Mites, Whiteflies, and other soft bodied insects.
Aphidius Ervi: Most Aphids. Potato Aphid , Greenhouse Potato Aphid , Pea Aphid and Green Peach Aphid.
Aphelinus abdominalis: A wide range of Aphids. Aphid parasite of choice for the Potato Aphid (Macrosiphum euphorbiae) and the Glasshouse Potato Aphid (Aulacorthum solani).
Aphidoletes aphidimyza: Many species of Aphids.