A new species of bees offers a major breakthrough in the global fight against the parasitic Varroa mite, new research report.
The invasive mite, which has spread to countries except Australia and Antarctica, has been the biggest threat to honey bee since its first outbreak 50 years ago.
In the study – by the universities of Louisiana and Exeter, and the U.S. Department of Agriculture’s (USDA) agricultural research service – “Pol -line” bees, bred to fight the mite to a strong 20-year development program. tested with a standard method in a large pollination process.
The mite is more than twice as likely to survive in the winter (60% survival compared to 26% in normal honey bees). Although normal honey bees have higher losses unless major miticide drugs are used.
“Ka Varroa The mite is the biggest threat to the conservation of bee colonies around the world, ”said Dr Thomas O’Shea-Wheller, of the Environment and Sustainability Institute at Exeter’s Penryn Campus in Cornwall.
“Currently, there is little demand for new methods of controlling mites – and the diseases they carry, and the resistance of mites to chemical drugs is increasing.
“By selecting bees to detect and remove mites from their colonies, our research found a significant reduction in mite numbers, and more importantly, a two -fold increase in survival rates. colony.
“While this is a major challenge, the continued reproduction and use of these lizards has consistently shown promising results.
“This kind of protest provides a natural consequence and perpetuates the threat posed by Varroa mites, and does not rely on chemicals or human activity. “
The study was held in three U.S. states (Mississippi, California, and North Dakota), where commercial beekeepers move tens of thousands of colonies each year to provide pollination for agriculture. great.
Varroa The mite is native to Asia, so European bees (which are usually kept for pollination) do not grow with them, and therefore there is no reasonable resistance.
Like humans, preserved bees are “separated” from natural selection, Drs. O’Shea-Wheller said, therefore, they cannot develop resistance like they did in the forest.
However, bee hives sometimes respond to mites (which re -create in the chambers of bee larvae) by repelling the affected litter – killing the litter and mites. , in the form of so -called Varroa– pure cleansing (VSH).
By choosing breeding for this type, the colonies can be made to protect themselves from infestation, while maintaining a large number of colonies and high honey production.
“The great thing about this particular type is that we’ve learned honey bees of all kinds to display it at some level, so we know with the right tools, it can be picked up and selected. for the pi of each, ”said the research molecular biologist. Dr. Michael Simone-Finstrom, of the USDA Agricultural Research Service.
The survival of the colony in the winter is important for beekeepers, because the bees prefer the beginning of the spring – a great time for pollinating valuable plants such as almonds. .
The study also looked at the levels of associated viral infections Varroa mites in mites.
The colonies were fed Varroa Resistance showed low levels of three major pathogens (DWV-A, DWV-B, and CBPV).
Interestingly, when viewed in contrast to the levels of mite infestation, these diseases did not strongly predict colony loss.
“A lot of research is being done on the diseases, without a lot of looking at the mites themselves,” said Drs. O’Shea-Wheller said.
“Viral diseases are important, but we have to go back and work hard to give the best possible results, because if you control the mites, you control the diseases they transmit. . “
Dr. O’Shea-Wheller said breeding and testing bees is expensive, but breeding mite-resistant bees is a good price in the long run, and that’s the only result. continue to treat bee hives. Varroa chronic kidney disease.
The paper, printed in a journal Scientific EvidenceWhich is the title: “A derived honey bee stock confers resistance to Varroa destructive and associated viral transmission. ”
More information on how the fly fights the deadly varroa mite in dressing
The honey extract provides resistance to the Varroa killer and associated viral transmission. “, Scientific Evidence (2022). DOI: 10.1038 / s41598-022-08643-w
Presented by the University of Exeter
Directions: Sustainable honey production from Varroa mite (2022, April 7) Retrieved 7 April 2022 from https://phys.org/news/2022-04-sustainably-honey-bees- varroa-mite.html
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