Luc, how are Your t. gileri now?
Friends, about minimum temperatures: all depends on how long they occur . Long-term - several days , maybe a week or two with temperatures below 40-50 F will kill (small) these and other theobroma. Big trees hold out longer. Also the maximum temperatures are important. T. gileri treated by temperatures above 95 F + partial sun and You could see the damage ( yellow leaves).
Before i lost my gileri i found something on leaves. Maybe it is normal (starch, saccharose or something else?) Is there anyone who find similar to these growths on gileri leaves?