ARBICO Organics Diglyphus Isaea Leafminer Parasite Beneficial Wasps, Pack of 1,000 (4 x 250)Warm Weather Leafminer Parasite helps control and prevent Agromyzid leafminers during warm weather and in greenhouses. Ships FREE via Overnight methods on Tuesdays Only. MINIMUM 7 day processing prior to shipment. These 2 mm. mini wasps, like D. siberica, work best when used to prevent the establishment of several leafminer species. They can also tackle minor infestations. Once a colony is established, they can adequately protect a crop throughout the