Aphid Parasite, Aphidius colemani - 5,000 - GN-AC50Stop aphid infestations early with these aphid parasites! Use Aphidius colemani as a preventative or active control measure. Aphidius colemani is a parasitic wasp native to North America useful for biological control of aphids in greenhouses and outdoor growing. These tiny (1 8" or 2 3 mm) aphid parasites seek out aphid colonies to provide food and a place to oviposit. Adult A. colemani respond to alarm signals from plants to locate the aphids where