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Monarch Caterpillar Failures

Hi everyone,

This is my second summer attempting to raise monarchs. It seems I have a very low success rate and I'm wondering what I'm doing wrong. This will probably be a long post, but I appreciate anyone who takes the time to read it and give me some feedback.


At first I started in a small popup bug keeper (like the ones you get in Toys R Us) and they were small and hard to use so I used a terrarium I had and successfully raised one monarch in that.


This year I bought one of those mesh 22 gallon keepers from LLL reptiles and I love it. I had 3 eggs that I found the beginning of July that hatched on the 4th. They were super healthy and got all the way to the 5th instar stage. The first one went to the top, did the little spiny thing to attach himself to the mesh, and then stayed in what I would describe as a 'w' rather than a 'j' and started leaking. The second one did the same 'w' shape and just died. Didn't leak at all.


The third one went up and spun itself to the mesh, and got the white stuff everywhere. It was all over all of it's legs and it made like a weird mess of web and wasn't attached to the mesh. It hung down like a 'j' - although I'm not sure it was intentional and then it did the leaking and died.


I have one more caterpillar that is small. I took him out and cleaned everything and let it dry before putting him back in.


I have swamp milkweed. I take 5-6 inch cuttings of milkweed and put the stem in a tupperware container so the leaves last longer. I use NO insecticides or anything in my garden. It's inside my fence inside a garden fence so no one is getting anything on it. I got the milkweed from a local nursery and should not have been treated with anything. The owners are very passionate about saving monarchs and gave me bonus milkweed when I bought mine because they want people to plant it.


None of their frass was mushy or watery. All very dry. They seem super healthy until they try to pupate? I saw no larvae or anything that came out when they were leaking. They didn't turn solid black like I've seen although once I know they are dead I don't leave them in there I get rid of them.


We keep our house at 78 degrees. I wondered if it wasn't humid enough so I was going to put a try of rocks with water in it in there, but read that you don't want moisture at all because it's a playground for bacteria.


I honestly don't know what to do. It's so disheartening to get them all the way to that stage and then they die. I feel like I need to just leave them in the garden unless I can figure out what I'm doing wrong because they seem to have no chance of surviving with me at the moment. Any advice anyone has would be greatly appreciated.


Michaela

Comments (6)

  • 11 years ago

    Some photos of my setup


  • 11 years ago
    last modified: 11 years ago

    Hi Michaela!

    How frustrating for you. I'm sorry.

    I am a total newbie who is raising Monarch, Gulf Fritillary, and Eastern Giant Swallowtail butterflies (I had a Black Swallowtail, but it didn't make it). This is my first year being successful at raising Monarchs. Several years ago, a family gave me lots of Monarch caterpillars. I didn't know anything about OE and all of them eclosed very deformed. Now I know it had to be OE.

    This year I went out and bought a 3-gallon Tropical Milkweed and have subsequently bought a few more as the caterpillar population has exploded! I have had a couple "cats" that started looking not so good, but they were just getting ready to transform into the next instar stage and once they shed their skin they looked great. All made their chrysalis, but one never emerged and so I "euthanized" it.

    Here is my set-up before cleaning this morning. There are 6 chrysalides and 9 fat cats. My house (north of Houston, where it's in the high 90s outside) is 78 inside and 60% humidity. It sounds like there is either a disease or parasite...I move caterpillars into this set-up when they are just a day or two from making their chrysalis. When the are really small, I keep them in a big glass vase. I load the environments with milkweed. I have been spotted out front in my PJs with scissors in hand cutting fresh milkweed to feed the gang (I'm sure people think I am nuts). I clean the frass off the blue lid when I swap out the plants, about every other day.

    You might consider enclosing them in an organza bag outside....contained and protected.

    This batch will bring my total, so far this year, to 30+ raised.

  • 11 years ago

    Thank you so much for sharing your experience. Maybe a dumb question but how do you test the humidity in your house?


    I tried to find a disease that fit the situation I ran into but I couldn't find anything. And I brought them in as eggs which I thought gave them better odds?


    Sounds like my cleaning routine is about the same as yours. I try to keep it clean of frass and I never felt like it was dirty.


    I was going to try to keep them in my mudroom but it gets so hot in there I thought it would bake them. I am worried about trying to keep them outside. We get so much rain and high winds I feel like their enclosure would blow away. I put together one of those greenhouses and weighed it down with bricks and one day came home to it in pieces all over the place and it was even protected up against our shed.


    I appreciate you sharing your experiences with me. I hope I can find a way to keep them inside. :/


  • 11 years ago
    last modified: 11 years ago

    My in-house thermometer has a hydrometer (?) too, which gives % humidity.

    Go to http://www.yourorganzabag.com and buy some cheap organza bags...I move them around as the cats grow and eat the food supply on the branch that I cover. It's a thought. You tie the bags on so they won't go anywhere!!

    Here's the link for my bagged cats...well, it was peaches at the time, but same principal.

  • 11 years ago

    Oh good to know I will look for one of those!


    Oh those are interesting. I will take a look at those! Thank you very much!