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New Zealand Beekeeping Forums
New Zealand Beekeeping Disease & Pests
Chalkbrood
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<blockquote data-quote="John B" data-source="post: 8478" data-attributes="member: 207"><p>I have more chalk brood this year than I have seen since we first got it. I even had one hive that is so bad it may not survive. Every hive in New Zealand will have chalk brood spores, these spores affect hives more when conditions aren't perfect such as when they are short of pollen or when you get a lot of cold snaps and they can't keep the brood nest as warm as they would like. There is absolutely a genetic component and a lot of my troubles I blame on neighbouring beekeepers keeping bees that are not resistant and those bees have been mating with my selected resistant stock.</p><p>Having said all that unless they have really bad chalk brood it will normally clear up as the weather warms up. A few years ago I had quite a bad hive and was going to re-queen but I decided to keep it at home as I was having a field day in a couple of weeks and wanted to have a diseased hive to show people. When I opened the hive up there was not a single cell of chalk brood left in it.</p><p>When we first got chalk brood it spread to every hive with lightning speed but selective breeding eliminated most of the bad effects from it. There is no doubt that some areas suffer worse from chalk brood than others and those the areas you should get your breeders from. Areas with cold miserable springs tend to have a lot more chalk brood then nice warm places. I generally ignore chalk brood unless it's really bad and where hives just have a smattering they will normally clear it up and advance as well as or nearly as well as other hives.</p><p>It's probably not that good to put a really heavily infested frame into a hive with no symptoms but I guarantee that every hive in New Zealand has chalk brood spores in it.</p><p>It is believed by many including me that chalk brood came into the country with illegal imports of Caucasian queens. It is something we could have well done without but can generally live with. As a footnote there are strains that are more virulent than others and it is important to keep bees out of the country even if MPI don't recognise this as a fact.</p></blockquote><p></p>
[QUOTE="John B, post: 8478, member: 207"] I have more chalk brood this year than I have seen since we first got it. I even had one hive that is so bad it may not survive. Every hive in New Zealand will have chalk brood spores, these spores affect hives more when conditions aren't perfect such as when they are short of pollen or when you get a lot of cold snaps and they can't keep the brood nest as warm as they would like. There is absolutely a genetic component and a lot of my troubles I blame on neighbouring beekeepers keeping bees that are not resistant and those bees have been mating with my selected resistant stock. Having said all that unless they have really bad chalk brood it will normally clear up as the weather warms up. A few years ago I had quite a bad hive and was going to re-queen but I decided to keep it at home as I was having a field day in a couple of weeks and wanted to have a diseased hive to show people. When I opened the hive up there was not a single cell of chalk brood left in it. When we first got chalk brood it spread to every hive with lightning speed but selective breeding eliminated most of the bad effects from it. There is no doubt that some areas suffer worse from chalk brood than others and those the areas you should get your breeders from. Areas with cold miserable springs tend to have a lot more chalk brood then nice warm places. I generally ignore chalk brood unless it's really bad and where hives just have a smattering they will normally clear it up and advance as well as or nearly as well as other hives. It's probably not that good to put a really heavily infested frame into a hive with no symptoms but I guarantee that every hive in New Zealand has chalk brood spores in it. It is believed by many including me that chalk brood came into the country with illegal imports of Caucasian queens. It is something we could have well done without but can generally live with. As a footnote there are strains that are more virulent than others and it is important to keep bees out of the country even if MPI don't recognise this as a fact. [/QUOTE]
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