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New Zealand Beekeeping Forums
Commercial Beekeeping in New Zealand
making oxalic strips
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<blockquote data-quote="tristan" data-source="post: 12830" data-attributes="member: 30"><p>in the hive the OA gets cleaned off quite quickly. you don't have to try to avoid crystallization inside the hive, the bees do that already. if you look at the parts of the strip the bees cannot get to (or go to), the OA builds up. i've had it a few mm thick. yet the rest of the strip is clean and it works over time quite well. the bees still get the acid on them (randy olivers testing) and mites still die, even tho the strip is clean.</p><p></p><p>if you look at the amount of OA in a hive after vaporizing, its a lot higher for similar mite kill than OAE. with dry OA you need a lot more. plus bees get rid of dry OA rather quickly. eg vaporizing is only good for 4 days.</p><p>so imho having dry OA on the outside of the strip is a waste. </p><p></p><p>you only have to avoid crystallization on the strip when they are outside of the hive. especially when storing them for a long time.</p><p>i've had them on the bench is a dry, medium humidity house and they grow the crystals on the surface.</p><p>also had OAE mixture left on the bench and it goes wetter as it absorbs moisture. (and wetter mix gets spread more and ends up being hot and nasty on the bees)</p><p>so storing strips open to the air is most certainly not good.</p></blockquote><p></p>
[QUOTE="tristan, post: 12830, member: 30"] in the hive the OA gets cleaned off quite quickly. you don't have to try to avoid crystallization inside the hive, the bees do that already. if you look at the parts of the strip the bees cannot get to (or go to), the OA builds up. i've had it a few mm thick. yet the rest of the strip is clean and it works over time quite well. the bees still get the acid on them (randy olivers testing) and mites still die, even tho the strip is clean. if you look at the amount of OA in a hive after vaporizing, its a lot higher for similar mite kill than OAE. with dry OA you need a lot more. plus bees get rid of dry OA rather quickly. eg vaporizing is only good for 4 days. so imho having dry OA on the outside of the strip is a waste. you only have to avoid crystallization on the strip when they are outside of the hive. especially when storing them for a long time. i've had them on the bench is a dry, medium humidity house and they grow the crystals on the surface. also had OAE mixture left on the bench and it goes wetter as it absorbs moisture. (and wetter mix gets spread more and ends up being hot and nasty on the bees) so storing strips open to the air is most certainly not good. [/QUOTE]
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making oxalic strips
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