The tiny parasitic wasp D.Sibirica kills the leaf miner by laying an egg inside the miner. The parasitic wasp D. Isaea kills a miner and lays an egg next to it for the hatching larvae to eat. Works best in warm environments. Each bottle contains 225 D. Sibirica and 25 D. Isaea. Preferred shipping UPS Next Day Air. Call for Best Rates.