Mime-Version: |
1.0 |
Sender: |
|
Subject: |
|
From: |
|
Date: |
Thu, 7 Sep 2006 07:11:19 -0400 |
In-Reply-To: |
|
Content-Type: |
multipart/mixed; x-avg-checked=avg-ok-2A06A31;
boundary="=======AVGMAIL-44FFFE6A0FBB=======" |
Reply-To: |
|
Parts/Attachments: |
|
|
> I believe OA reduces the life span of adult bees but this is only my
>subjective observation. I have no way of measuring this.
Perhaps this is so. In Randy's report, he states that multiple OA trickle
treatments don't harm the bees. Others present conflicting reports, both
positive and negative. Where it might do harm would be with the winter
bees. Two years ago, I OA trickled my over wintering nucs. I killed nearly
70% doing so. I don't think they had a cleansing flight afterward, so maybe
that was the problem.
But, that's the trickle method. The vapor method is easier on the bees, and
can be repeated. The vapor method can be used at anytime of the year,
provided the temps are 3 -5 deg above freezing. For best control, treat
colonies after they are broodless. Getting them to that point without
crashing from PMS is the hard part. Colonies with a light mite load will
make it, but not those with moderate or heavy mite load. Three vapor
treatments, 7 days apart, will kill enough of the mite population to get
the colony to the broodless period. A final treatment at that time will
achieve 90+% kill.
See these sites:
http://www.mellifera.de/engl2.htm
http://www.members.shaw.ca/orioleln/Oxalic_Acid.htm
Talking with Heinz at the second site, he tells me that there is no damage
to the open brood. I guess the first site has links to tests done in
Switzerland, but they are in German. Waldemar, do you read German?
I'll be treating some colonies next week, and will check for brood damage
in the week following treatment.
Mike
-- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.405 / Virus Database: 268.11.7/436 - Release Date: 9/1/2006
-- Visit www.honeybeeworld.com/bee-l for rules, FAQ and other info ---
|
|
|