I don't know if i would call it a "lull" but their is definitely a change in deer behavior/activity during this time of the year where i am at. The most significant differences i have noticed from Sept. to now is their are still hot temps, (at least above average temps most days) and changing food sources, from fields, to mast. Apples and acorns have been disappearing off the ground lately and thats when i have seen deer, coming to feed or leaving a feeding area. Deer tend to not move around as much during daylight when it is warm, we all know that, and it has been that way most thedays around here after the opening week or so. When i have seen deer so far this year it has been from 5:22-7:12pm (they all have been coming into my woods to feed, or using trails to come back from feeding like i said) and i have had a N or NNE wind most of the time i have seen them. So maybe the wind has to do something with it too? Im sure it might, not that they don't move when the wind is a certain way, but they just might move in different directions (away from my stand) depending on the wind, i dont have the luxury of having 10 stands for different wind directions ;/ so if the wind is bad i have to be careful, and even if i dont see deer that day, its still nice to be out there even though it can be frustrating.
I don't give into beleiving the whole "lull" thing, but i do believe this time of the year can be one of the hardest times to hunt and it can also be the most rewarding if you put the time into getting into the woods and patterning deer. I just found a great rubline that i totally overlooked for two weeks, im thinking about going out there tom morning to the ground blind i made a few days ago, if not i'll head out to my tree stand and see what happens. I might take PrarieShadow's advice and try the rubline thing out once or so before the rut kicks in. Good hunting to all and don't give up hope if it is slow right now, be patient.