Hi
I second the idea of a quarantine for the cigars for the area of infestion if not the entire humidor (especially when the problem has gotten out of hand).
1. I would examine the sticks in the general area first (look at points 4 & 5 below), isolate the cigars around the infested cigar (throw away the infested cigar), and watch them for a few weeks. I would pack the suspect cigars in groups if one to five using plastic zip lock, cbid cigar bags etc.
2.I would also look through the entire humidor and check the contents for a problem every day for a number of weeks just to be sure.
3.If you find another cigar with the whole like the one pictured I would throw it away and follow the steps above. If the infestation is wide spread I would quarenteen the whole Humidor isolating the whole group as in step 1. Keep in mind the problem might not have been due to the cigar pictured.
4. Another good way to know if you might have a problem with a cigar, even if the whole is not present, is to tap the open end of the cigar lightly on the palm of you hand. If you see little grains like saw dust coming out you have might have the same problem. If this happens you should isolate the cigar and wait to see if the bugs appear. I would also isolate the others in the area like the steps above.
5.Check the cello,it serves in part as a barrier against bugs. If there is a whole in it, chances are they got through follow the steps above .
Best
Q