{"id":679,"date":"2021-06-07T22:35:25","date_gmt":"2021-06-07T22:35:25","guid":{"rendered":"https:\/\/goldenglowbees.com\/?p=679"},"modified":"2021-06-07T22:36:22","modified_gmt":"2021-06-07T22:36:22","slug":"fungus-fights-mites-that-harm-honey-bees","status":"publish","type":"post","link":"https:\/\/goldenglowbees.com\/?p=679","title":{"rendered":"Fungus fights mites that harm honey bees"},"content":{"rendered":"\n

By Scott Weybright, College of Agricultural, Human, and Natural Resource Sciences<\/p>\n\n\n\n

PULLMAN, Wash. \u2013 A new fungus strain could provide a chemical-free method for eradicating mites that kill honey bees, according to a study published this month in Scientific Reports<\/a>.<\/p>\n\n\n\n

A team led by Washington State University entomologists bred a strain of Metarhizium, a common fungus found in soils around the world, to work as a control agent against varroa mites. Unlike other strains of Metarhizium, the one created by the WSU research team can survive in the warm environments common in honey bee hives, which typically have a temperature of around 35 Celsius (or 95 F).<\/p>\n\n\n\n

\u201cWe\u2019ve known that metarhizium could kill mites, but it was expensive and didn\u2019t last long because the fungi died in the hive heat,\u201d said Steve Sheppard, professor in WSU\u2019s Department of Entomology<\/a> and corresponding author on the paper. \u201cOur team used directed evolution to develop a strain that survives at the higher temperatures. Plus, Jennifer took fungal spores from dead mites, selecting for virulence against varroa.\u201d<\/p>\n\n\n\n

Jennifer Han, a post-doctoral researcher at WSU, led the breeding program along with WSU assistant research professors Nicholas Naeger and Brandon Hopkins. Paul Stamets, owner and founder of Olympia-based business Fungi Perfecti<\/a>, also contributed to the paper. Stamets is a fungi expert, well-known for using several species in applications ranging from medicine to biocontrol.<\/p>\n\n\n\n

Varroa destructor mites, small parasites that live on honey bees and suck their \u201cblood,\u201d play a large role in Colony Collapse Disorder, which causes beekeepers to lose 30-50% of their hives each year. The mites feed on bees, weakening their immune systems and making them more susceptible to viruses.<\/p>\n\n\n\n

The main tools beekeepers use to fight varroa are chemicals, such as miticides, but the tiny pests are starting to develop resistance to those treatments, Naeger said.<\/p>\n\n\n\n

Metarhizium is like a mold, not a mushroom. When spores land on a varroa mite, they germinate, drill into the mite, and proliferate, killing it from the inside out. Bees have high immunity against the spores, making it a safe option for beekeepers.<\/p>\n\n\n\n

Stamets, who did some of the initial testing with Metarhizium that showed the fungus couldn\u2019t survive hive temperatures, was impressed by the work done by the WSU researchers.<\/p>\n\n\n\n

\u201cScience progresses through trial and error, and my technique wasn\u2019t economical because of the hive heat,\u201d he said. \u201cBut Jennifer did enormous amounts of culture work to break through that thermal barrier with this new strain. It\u2019s difficult to really appreciate the Herculean effort it took to get this.\u201dhttps:\/\/www.youtube.com\/embed\/LIfTsPikxqU?version=3&rel=1&fs=1&autohide=2&showsearch=0&showinfo=1&iv_load_policy=1&wmode=transparent<\/p>\n\n\n\n

Han and Naeger screened more than 27,000 mites for levels of infection to get the new strain.<\/p>\n\n\n\n

\u201cIt was two solid years of work, plus some preliminary effort,\u201d Han said. \u201cWe did real-world testing to make sure it would work in the field, not just in a lab.\u201d<\/p>\n\n\n\n

This is the second major finding to come from WSU\u2019s research partnership with Stamets involving bees and fungi. The first involved using mycelium extract<\/a> that reduced virus levels in honey bees.<\/p>\n\n\n\n

\u201cIt\u2019s providing a real one-two punch, using two different fungi to help bees fight varroa,\u201d Stamets said. \u201cThe extracts help bee immune systems reduce virus counts while the Metarhizium is a potentially great mite biocontrol agent.\u201d<\/p>\n\n\n\n

The next step is to seek approval from the Environmental Protection Agency to use Metarhizium on hives used in agriculture. The team must also finalize delivery methods for beekeepers to apply the fungus in hives.<\/p>\n\n\n\n

\u201cWe hope in 10 years that, rather than chemical miticides, Metarhizium is widely used to control Varroa mites,\u201d Sheppard said. \u201cAnd that the mite problem for beekeepers has been significantly reduced.\u201d<\/p>\n\n\n\n

The team thinks the methods they developed to evolve Metarhizium for varroa control could be used to improve biocontrol agents in other crop systems as well.<\/p>\n\n\n\n

The majority of the funding for this work came from private donations from individuals and foundations. Additional funding came from Washington State Department of Agriculture (WSDA) Specialty Crop Block Grant K2531 and the USDA National Institute of Food and Agriculture, Hatch 1007314.<\/p>\n\n\n\n

\"Close<\/a>
Varroa mites seen living on a honey bee. Mites weaken bees\u2019 immune systems, transmit viruses, and siphon off nutrients. Photo by Scott Bauer, USDA Agricultural Research Service.<\/figcaption><\/figure>\n\n\n\n

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