Trichogramma pretiosum: these parasitic wasps attack the egg stage of many different moths and butterflies. Use for field and row crops. Time releases for peak egg laying using pheromone traps and field inspection. Usually weekly releases for 4-6 weeks for each generation of egg-laying periods. Sent as 5,000 parasitized eggs on cards. Small garden: 12,000/sq.ft. Irrigated field crops: 60,000/acre. Ship Priority Mail.