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Hello, I’m at the end of my second year so I’m still trying to learn. I’m in SW MS
I haven’t been in this hive for a while due to medical conditions. Today I removed the supers to find lots and I do mean lots of dead bees on the queen excluder. It was completely covered at least a 1/2 “ deep. I don’t see how any got out or in the supers. Any ideas on what may have killed all these bees? There are lots of others and all seem healthy and normal.
 

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MS - Mississippi or Missouri? Temperature? I don't use queen excluders, I call them honey excluders. I never fully rob my bees anyway, so if there is a brood frame in the super I don't extract it.
 

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MS - Mississippi or Missouri? Temperature? I don't use queen excluders, I call them honey excluders. I never fully rob my bees anyway, so if there is a brood frame in the super I don't extract it.
Mississippi, had lots of rain prior to my finding them and temps in 80’s during day low 60’s to high 50:s at night
 

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Hi Tom,
I always use a queen excluder since I use the shorter supers and I don't want brood in them. I've never had a problem with what you've described. Are you using a plastic or a metal excluder? I always try to keep my extruders free of propolis as the bees tend to block them up otherwise. Perhaps there weren't enough openings in your excluder for all of them to get too. It's strange too that the rest of the bess seem healthy. If it was a disease or pesticide you'd think the entire hive would be affected.
 

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Hi Tom,
I always use a queen excluder since I use the shorter supers and I don't want brood in them. I've never had a problem with what you've described. Are you using a plastic or a metal excluder? I always try to keep my extruders free of propolis as the bees tend to block them up otherwise. Perhaps there weren't enough openings in your excluder for all of them to get too. It's strange too that the rest of the bess seem healthy. If it was a disease or pesticide you'd think the entire hive would be affected.
That’s what I thought but they are still doing fine. It is a plastic excluder and all I did was dump the dead bees. Excluder was not blocked.
 

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Hello, I’m at the end of my second year so I’m still trying to learn. I’m in SW MS
I haven’t been in this hive for a while due to medical conditions. Today I removed the supers to find lots and I do mean lots of dead bees on the queen excluder. It was completely covered at least a 1/2 “ deep. I don’t see how any got out or in the supers. Any ideas on what may have killed all these bees? There are lots of others and all seem healthy and normal.
We all of the bees drones? That has happened to me after I put an excluder under a cross comb brood box that I from a purchased hive.
 

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Hello, I’m at the end of my second year so I’m still trying to learn. I’m in SW MS
I haven’t been in this hive for a while due to medical conditions. Today I removed the supers to find lots and I do mean lots of dead bees on the queen excluder. It was completely covered at least a 1/2 “ deep. I don’t see how any got out or in the supers. Any ideas on what may have killed all these bees? There are lots of others and all seem healthy and normal.
What might have happened: Your hive could have CBPV. This usually shows up after the bees have been confined for a period of days due to the weather. This usually results in a pile of dead bees along the ground about an inch high or do under the entrance. Since you had an excluder on maybe the dead bees could not be be carried out because of that.
 
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It would not be normal for your colony to have that many drones.

Normally bees try to remove themselves from the hive when they die.
Dying in the hive indicates that they were quickly incapacitated,
an illness usually causes a slow decline and the bees are able to exit the hive under their own steam.

I am thinking pesticide exposure may have caused your die off.
You could send some dead bees to be tested? Doesn't seem worthwhile for a one time occurrence.
If the dead were all worker bees it is unlikely that so many would die at the same time from health issues.
How long since the hive was last worked? Sounds like over a month.
If this happened over some time it might be a health issue, it is unlikely for a lot of bees to die in mass in a short time due to health issues.
That is usually caused by pesticide exposure.

I'm not sure the bees can drag a carcass through the queen excluder to remove them from the hive.
Where there any dead in the lower box/board? The undertakers may have hauled them off and dumped them away from the hive.
Where there any dead on the ground under the entrance?
 
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