Good question. I am currently experimenting with this idea. I have 4 different subspecies of Field crickets here in central Alabama;
Gryllus rubens, the Southeastern Field cricket,
Gryllus firmus, the Sand Field cricket,
Gryllus texensis, the Texas Field cricket and
Gryllus fultoni, the Sand Field cricket. There are 5-6 generations a year here and right now the last generation is laying the last eggs for the season. They will lay dormant all winter and be the first generation to hatch and start the whole process over in 2012. I've found that they aren't much different than
Acheta domesticus, except that they don't do so well crowded together. The males will give a warning call to another male singing nearby so normal breeding behaviour is hard to achieve. They are very solitary in the wild. I have a small group of what appear to be
rubens that I plan on trying to breed. But to answer your question, I incubate them at the same high temperatures I do for domesticus, but seeing how they go through a dormancy during the winter, I'm sure that they can withstand cooler temperatures.
Future Gryllus rubens breeding group
Gryllus fultoni , Southern Wood cricket
This is Gryllus rubens ( lower left) Gryllus fultoni (top) and Acheta domesticus (lower right)