Getting very disturbed over this.....population crash

[simplyhoney]

Thanks all who posted it the previous post. I've been harvesting a little honey the past couple of day so I just had time to reply. Still lots of bees going backwards.
Poison in the pollen is not real likely as the problem seems to be with the older forage bees not the young nurses, attendants, or even brood. As I said befor there are colonies that have no possible access to any man made poison. At present about 150 of my hives out of about 550 are showing these problems. Of these all most have a shotgun pattern, but when inspected the larva appear healthy. Mite counts on these colonies are low (sugar rolled with one cup of bees I found 1 colonie with 3 most with none or 1) about 1 out of 4 of these sick colonies show MINOR signs of either chalk brood, chilled brood, or sac brood. 3 had EFB.
Basically brood production was slow but steady, the odd thing is that in July, these bees looked health while I was supering with very large nice populations, now the have one to three deeps of honey, capped but when you drive the bees down and harvest the top of the hive body isn't even covered with bees, they look as though the bees are starting all over from spring.
Anyway, enough rattling. I guess my main reason for posting is to ask the greater beekeeping community to ask around in your local area and see if anyone else is having problems. If not I guess I can only attribute it to virus' or eviromental factors.

thanks
Simplyhoney

[peggjam]

I haven't had any problems here. Have you requeened these colonies lately? What do your drone populations look like? How many frames of brood do you have per coloney? What you describe above sounds like stress deseases, deseases that normally are beign, until something stresses the coloney and opens an oppertunity for these things to develop. Did these colonies have a large mite load in the spring?? Have you done any treatments for treachel mites? Hmmmmm.........