i added photo to actias 
Either they are ready to pupate or they have a problem. What you should do in either case, is to remove the contaminated leaves!
If they have diarrhea, bacteria will be spread throughout the whole colony and all of them will die within a few days.
Same is the case if this is the liquid that they excrete before pupation: at this time the whole gut will be emptied and the caterpillars get rid of all dispensable water via the intestinal system. Hereby, lots of bacteria are secreted, which can be a risk for the feeding caterpillars. In the latter case, the larvae that have excreted the fluid should be already spinning their cocoons. If they don't, the probability for a diesease is very high.
Hello Ignacio,
The problem I had right in the caterpillar stage. For me it is just getting a little brown and yellow on the back. The leaves, you should at least have a thorough wash and remove the red stains completely. The brown caterpillar was then placed into a container and maintained as extrta through. When they came through Wed and still lives with others. For me it was just a caterpillar in L3 might be possible in the esgut that she died of something. Otherwise, it was the other matter. Now they pupate comfortable and everything is okay.
I hope you could help.
Best regards Miles
Hello,
Why plants lying on the ground with droppings ? Bad idea, also need fresh air.
This is better environment:
[Blockierte Grafik: C:%5CDocuments%20and%20Settings%5CMarcinC%5CPulpit%5CIMG_1998.jpg]
It seems that they are about to pupate. But indeed, it seems very high humidity which could cause infection.
Best regards,
Martin
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