Mona Miller wrote:Interesting. I've never had them emerge from anything other than a J or a pupa.
Yup. I would say this year about half of my flies came out of 3rd/4th instar cats that died for no apparent reason (as opposed to deaths that could likely be ruled as from black/green/bacterial deaths). The cats would be fine one day and then the next start acting lethargic. By the evening or next morning they'd be dead. I set the carcasses in lidded cups and wait a day or two.. usually I would find anywhere from 1-3 fly pupa after the wait. The other half of my fly infections this year were from 5th instars that failed in the "j" or came from the chrysalis. With the chrysalis they would be fine at first, but after a day or so would get this light dirty brown soft spot and then they would become a very pale green instead of the bright green. Sometimes it was easy enough to see the chrsyalis would survive long enough for you to see the beginnings of a butterfly almost ready to emerge, but then never emerge..later it would turn a dark solid black and not long after that fly pupas would be seen on the bottom of the containers. I then freeze the nasty little flies.
Oh, this morning while collecting milkweed from my yard, I found the carcass of a Tachinid fly on a milkweed leaf. Apparently it had been hunting for pillars to infect and a spider nailed it's little butt. sucked it dry. Go spiders! LOL.