I've only used the mulberry on one species and they are breeding. I just assumed that mulberry is fine. Might be an oopsie on my partno particular roach at this time, just want to get some collected as I will be adding to my collection this winter. I have quite a lot of oak and maple the browned on the tree. have heard/read the mulberry leaves had some type of insect repellent chemical in them but im guessing I may have got that wrong since you have used them.