Dear Janos. The pupa in the size and description you offer fits the description of whitefly (Aleyrodes spiraedides) which is not a problem in the Midwest near Chicago , but in California sometimes where it is much warmer. The pupa is as you describe-- about the size of a small grain of rice. about 8 mm long. A photo is shown on on p. 356 of The World of Irises--, Warburton and Hamblen, 1978 . Publ: The American Iris Society, Wichita, Kansas. I would think that any systemic insecticide would kill it and its progeny. I'd also open up the area to more sunlight and ventilation. If you're growing your irises in a greenhouse--this could definitely be the pest you've got. Grow your irises outdoors, unless you're talking about the oncocycli--but even those are sometimes best grown outdoors., except for those from Israel, Syria and Jordan. . ----- Original Message ----- From: "J. Agoston" <agoston.janos123@gmail.com> To: <pbs@lists.ibiblio.org> Sent: Wednesday, June 10, 2009 7:32 AM Subject: [pbs] iris fly? >