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I learned the following in the second level of U of Montana Journeyman:
I asked if using OA vapor or dribble would compromise open brood, the response from the professor;
“In a study using two applications 14 days apart (which is becoming increasingly popular even though it is not an approved application method) there was a high percentage of young (12.6% and 9.5%) and old honey bee larvae (10.6% and 5.6%) killed after the first and second oxalic acid applications (percent death shown in parenthesis above). Also, the overall area of the open brood was reduced by 17.5% after the two applications and stayed low for about two months.”
I asked if using OA vapor or dribble would compromise open brood, the response from the professor;
“In a study using two applications 14 days apart (which is becoming increasingly popular even though it is not an approved application method) there was a high percentage of young (12.6% and 9.5%) and old honey bee larvae (10.6% and 5.6%) killed after the first and second oxalic acid applications (percent death shown in parenthesis above). Also, the overall area of the open brood was reduced by 17.5% after the two applications and stayed low for about two months.”