Guys,
The hermies I worry about are the ones that start producing male flowers about half way thru the flowering stage. I don't really consider those "yellow bannanas" that tend to form in the middle of the top colas a week or two before harvest to be a problem. I regard it as another sign that it's time to harvest. I tweeze some of them out as I see them but even if they release some pollen there's so little time left that a seed doesn't have a chance to form. Occasionally I've gotten a couple of very small just beginning to form seeds in a bud but nothing that I consider to detract from the over all quality of the smoke.
Back in 2008 on a trip thru Holland I got my hands on some Allegria strain seeds (from Kiwi Seeds). On the first crop I isloated a male and collected it's pollen and then used it to pollinate several of the lower buds on each female. I got about 2 oz of seeds off that crop (while still keeping the nice big top buds seedless) and have used it for 4 sucessive grows that have been completely seedless. I've had no problems with hermies developing early in the flowering stage. But almost every plant tends to throw a couple of those "bannanas" right at the very end (last week or two before harvest). I guess technically that's a form of hermaphroditism but I just don't see that as a problem. The type of hermaphodism that I've had a problem with in the past (when growing from random bag seed) is where the plant starts out producing nothing but female flowers and then with in a couple weeks (around half way to harvest) also starts producing clusters of male flowers on lower branches. Those are the ones I'd get rid of.
And as regards having the plants light or dark cycle occasionally interupted being a stressor that causes hermies to form....well, I just don't think that the plants are that sensitive. I think getting those early stage hermies (as opposed to those late developing bananas) has far more to do with the plants genetics than any stress you might cause the plant with improper lighting, watering, nutes, etc. In other words if it's going to early stage hermie on you, it's going to do so no matter how you treat the plant.