Eretmocerus eremicus 5,000 - 20 x 250 Blister PacksShips via Overnight methods on Tuesdays Only. 7 day minimum lead time prior to shipment. For Delivery Only. Not available in store. Eretmocerus eremicus is a whitefly parasite used for prevention and control of low infestations of whiteflies. This parasitic wasp lays its eggs underneath whitefly nymphs, where they hatch and begin feeding on the whitefly. E. eremicus prefer 2nd instar whitefly larvae of the Silverleaf and Sweet Potato Whitefly. Use