[New post] Apivar/amitraz resistance and why the use and timing of a 'winter' oxalic treatment is beneficial. Hint … 'winter' may well be too late.
theapiarist.org/alternate-to...
#beekeeping
theapiarist.org/alternate-to...
#beekeeping
Alternate to exterminate
When and why you should treat with oxalic acid after late-summer use of Apivar. With resistance increasing, an alternate treatment — applied in a timely manner (so not 'sometime in winter') — helps…
theapiarist.org
October 10, 2026 at 9:02 AM
[New post] Apivar/amitraz resistance and why the use and timing of a 'winter' oxalic treatment is beneficial. Hint … 'winter' may well be too late.
theapiarist.org/alternate-to...
#beekeeping
theapiarist.org/alternate-to...
#beekeeping
“Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal.” www.science.org/content/arti...
Scientists identify culprit behind biggest ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
www.science.org
August 19, 2026 at 1:24 PM
“Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal.” www.science.org/content/arti...
Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide of its kind left in humans’ arsenal.
August 15, 2026 at 11:51 PM
Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide of its kind left in humans’ arsenal.
In a 14-day canine sarcoptic mange trial, all 20 dogs on the highest-dose topical clove oil were mite-free, compared with 10 of 20 on amitraz. The paper frames it as proof of concept.
Topical clove oil for canine sarcoptic mange promises faster, plant-based treatment
Canine sarcoptic mange (scabies) is a skin condition in which microscopic mites (Sarcoptes scabiei) infest dogs' skin. The condition is contagious and zoonotic and can be difficult to detect.
phys.org
August 15, 2026 at 5:40 PM
In a 14-day canine sarcoptic mange trial, all 20 dogs on the highest-dose topical clove oil were mite-free, compared with 10 of 20 on amitraz. The paper frames it as proof of concept.
Intentó ingresar a Texas con pesticidas en su Dodge Ram, pero la CBP le confiscó todo: el formulario que lo complicó
Un control fronterizo en Texas realizado por oficiales de la Oficina de Aduanas y Protección Fronteriza (CBP, por sus siglas en inglés) terminó con el decomiso total de una…
Un control fronterizo en Texas realizado por oficiales de la Oficina de Aduanas y Protección Fronteriza (CBP, por sus siglas en inglés) terminó con el decomiso total de una…
Intentó ingresar a Texas con pesticidas en su Dodge Ram, pero la CBP le confiscó todo: el formulario que lo complicó
Un control fronterizo en Texas realizado por oficiales de la Oficina de Aduanas y Protección Fronteriza (CBP, por sus siglas en inglés) terminó con el decomiso total de una camioneta Dodge Ram 3500 modelo 2015, un tanque auxiliar de combustible y una carga de insecticida amitraz que intentaba ingresar a Estados Unidos sin la documentación requerida. El procedimiento se realizó en el Puente Juárez-Lincoln, en Laredo.
lavozdequequen.com.ar
April 2, 2026 at 11:07 AM
Intentó ingresar a Texas con pesticidas en su Dodge Ram, pero la CBP le confiscó todo: el formulario que lo complicó
Un control fronterizo en Texas realizado por oficiales de la Oficina de Aduanas y Protección Fronteriza (CBP, por sus siglas en inglés) terminó con el decomiso total de una…
Un control fronterizo en Texas realizado por oficiales de la Oficina de Aduanas y Protección Fronteriza (CBP, por sus siglas en inglés) terminó con el decomiso total de una…
“…nearly all the dead colonies tested positive for bee viruses spread by parasitic mites. …every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal.”
www.science.org/content/arti...
www.science.org/content/arti...
Scientists identify culprit behind biggest-ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
www.science.org
July 1, 2025 at 10:08 AM
“…nearly all the dead colonies tested positive for bee viruses spread by parasitic mites. …every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal.”
www.science.org/content/arti...
www.science.org/content/arti...
Woa! Resistance to amitraz, last remaining pesticide effective against varroe, a bee mite, that infects honeybees has occurred. Nearly all bee colonies expect 30% bee death/yr. Worse, can spread to wild bees. www.theguardian.com/environment/...
‘Could become a death spiral’: scientists discover what’s driving record die-offs of US honeybees
Experts scrambling to understand losses in hives across the country are finally identifying the culprits. And the damage to farmed bees is a sign of trouble for wild bees too
www.theguardian.com
July 9, 2025 at 3:45 AM
Woa! Resistance to amitraz, last remaining pesticide effective against varroe, a bee mite, that infects honeybees has occurred. Nearly all bee colonies expect 30% bee death/yr. Worse, can spread to wild bees. www.theguardian.com/environment/...
In other words, the problem isn't something new so much as a bad case of more-of-the-same: we've relied on amitraz as a mite-killer so much that the varroa evolved to resist it, and the varroa spread diseases all through the hives.
Rotate your treatments, beekeepers. Don't stick to just one.
Rotate your treatments, beekeepers. Don't stick to just one.
June 4, 2025 at 1:33 PM
In other words, the problem isn't something new so much as a bad case of more-of-the-same: we've relied on amitraz as a mite-killer so much that the varroa evolved to resist it, and the varroa spread diseases all through the hives.
Rotate your treatments, beekeepers. Don't stick to just one.
Rotate your treatments, beekeepers. Don't stick to just one.
Detection of coumaphos, fipronil, flumethrin and amitraz susceptibility in Rhipicephalus sanguineus s.l. (Acari: Ixodidae) from Mexico PubMed
Detection of coumaphos, fipronil, flumethrin and amitraz susceptibility in Rhipicephalus sanguineus s.l. (Acari: Ixodidae) from Mexico
The brown dog tick, Rhipicephalus sanguineus sensu lato (s.l.), is an important ectoparasite with medical and veterinary significance worldwide. Control mainly relies on acaricides, which can contribute to the development of resistant tick populations. This study aimed to evaluate the susceptibility levels of R. sanguineus s.l. collected from different regions across Mexico, to the acaricides coumaphos, fipronil, flumethrin, and amitraz. Engorged ticks were collected from naturally infested dogs...
dlvr.it
November 28, 2025 at 6:01 AM
Detection of coumaphos, fipronil, flumethrin and amitraz susceptibility in Rhipicephalus sanguineus s.l. (Acari: Ixodidae) from Mexico PubMed
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters bioRxivpreprint
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters
As critical pollinators of agricultural crops, honey bees (Apis mellifera) play a vital role in food production. Therefore, it is imperative to investigate and develop new methods to control Varroa destructor, a devastating parasitic mite of honey bee colonies that weakens bees and spreads deadly diseases that lead to colony loss. Here, we adapted existing methods to investigate the role of ABCB1 transporters in mitigating the toxicity of amitraz, a widely used miticide approved for use in honey bee colonies, demonstrating that a pharmacological inhibitor can synergistically increase amitraz toxicity compared to the equivalent dose of amitraz alone. Evaluations performed on the mites used in one of the described experiments revealed a high proportion of the test subject mites (88.5%) possessed the amitraz resistant genotype, indicating that even in resistant mites, inhibiting ABCB1 transporters can increase amitraz efficacy. This promising finding may be useful in developing powerful synergists that can be used to increase the efficacy of new and existent miticides.
dlvr.it
April 30, 2025 at 4:12 AM
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters bioRxivpreprint
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia VetParasitol
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia
Publication date: June 2025
Source: Veterinary Parasitology, Volume 336
Author(s): Tamene Lemma, Eba Alemayehu Simma, Tesfaye Rufael, Sileshi Mekonnen, Delenasaw Yewhalaw
dlvr.it
April 29, 2025 at 3:09 PM
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia VetParasitol
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters bioRxivpreprint
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters
As critical pollinators of agricultural crops, honey bees (Apis mellifera) play a vital role in food production. Therefore, it is imperative to investigate and develop new methods to control Varroa destructor, a devastating parasitic mite of honey bee colonies that weakens bees and spreads deadly diseases that lead to colony loss. Here, we adapted existing methods to investigate the role of ABCB1 transporters in mitigating the toxicity of amitraz, a widely used miticide approved for use in honey bee colonies, demonstrating that a pharmacological inhibitor can synergistically increase amitraz toxicity compared to the equivalent dose of amitraz alone. Evaluations performed on the mites used in one of the described experiments revealed a high proportion of the test subject mites (88.5%) possessed the amitraz resistant genotype, indicating that even in resistant mites, inhibiting ABCB1 transporters can increase amitraz efficacy. This promising finding may be useful in developing powerful synergists that can be used to increase the efficacy of new and existent miticides.
dlvr.it
April 28, 2025 at 9:11 PM
Amitraz Toxicity in Resistant Varroa Mites Can Be Increased by Inhibiting ABCB1 Transporters bioRxivpreprint
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia VetParasitol
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia
Publication date: June 2025
Source: Veterinary Parasitology, Volume 336
Author(s): Tamene Lemma, Eba Alemayehu Simma, Tesfaye Rufael, Sileshi Mekonnen, Delenasaw Yewhalaw
dlvr.it
April 28, 2025 at 8:08 AM
In vitro susceptibility study of Amblyomma cohaerens and Rhipicepalus (Boophilus) decoloratus #tick species to amitraz 12.5 % and diazinon 60 % acaricides in Jimma town, Ethiopia VetParasitol
That treatment is primarily used by commercial beekeepers (think 500 to 10,000 hives under management) who interact with their hives prescriptively; (in April and July we apply X grams amitraz per hive deep) regardless of the state of the hive. This style of management was always doomed to fail. /2
July 3, 2025 at 5:32 PM
That treatment is primarily used by commercial beekeepers (think 500 to 10,000 hives under management) who interact with their hives prescriptively; (in April and July we apply X grams amitraz per hive deep) regardless of the state of the hive. This style of management was always doomed to fail. /2
So one thing this post doesn't cover is that the US has been dealing with synthetic pesticide resistance ever since the varroa mite was first imported. Amitraz is just the newest, and mite resistance to amitraz has been growing to the point of ineffectiveness for many years. /1
July 3, 2025 at 5:28 PM
So one thing this post doesn't cover is that the US has been dealing with synthetic pesticide resistance ever since the varroa mite was first imported. Amitraz is just the newest, and mite resistance to amitraz has been growing to the point of ineffectiveness for many years. /1
USDA caught wind of the record-breaking hive die-off, but their efforts were slowed by federal funding cuts and layoffs by Trump’s administration. Now, 6 months later, scientists have identified a culprit.
Mites are resistant to amitraz, the only viable miticide.
www.science.org/content/arti...
Mites are resistant to amitraz, the only viable miticide.
www.science.org/content/arti...
Scientists identify culprit behind biggest-ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
www.science.org
July 3, 2025 at 3:24 PM
USDA caught wind of the record-breaking hive die-off, but their efforts were slowed by federal funding cuts and layoffs by Trump’s administration. Now, 6 months later, scientists have identified a culprit.
Mites are resistant to amitraz, the only viable miticide.
www.science.org/content/arti...
Mites are resistant to amitraz, the only viable miticide.
www.science.org/content/arti...
#Apismellifera
#Varroadestructor
⚠️
In January "a full 62%" of the US commercial 🐝 colonies had already died. Nearly all of them tested positive for viruses spread by mites, and every single mite the USDA "researchers screened was resistant to amitraz, the only viable mite-specific pesticide left."
#Varroadestructor
⚠️
In January "a full 62%" of the US commercial 🐝 colonies had already died. Nearly all of them tested positive for viruses spread by mites, and every single mite the USDA "researchers screened was resistant to amitraz, the only viable mite-specific pesticide left."
Scientists identify culprit behind biggest-ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
www.science.org
July 1, 2025 at 2:42 PM
#Apismellifera
#Varroadestructor
⚠️
In January "a full 62%" of the US commercial 🐝 colonies had already died. Nearly all of them tested positive for viruses spread by mites, and every single mite the USDA "researchers screened was resistant to amitraz, the only viable mite-specific pesticide left."
#Varroadestructor
⚠️
In January "a full 62%" of the US commercial 🐝 colonies had already died. Nearly all of them tested positive for viruses spread by mites, and every single mite the USDA "researchers screened was resistant to amitraz, the only viable mite-specific pesticide left."
"Varroa destructor with resistance to synthetic miticide treatments (including synthetic pyrethroids Bayvarol and Apistan and synthetic formamidine Amitraz, Apivar and Apitraz) has been detected in South East Queensland."
Many hives lost on the mainland but bees still seem okay on the islands. 🤞
Many hives lost on the mainland but bees still seem okay on the islands. 🤞
🐝 𝐒𝐚𝐯𝐞 𝐓𝐡𝐞 𝐁𝐞𝐞𝐬, 𝓼𝐚𝐯𝐞 𝐎𝐮𝐫 𝐅𝐮𝐭𝐮𝐫𝐞! 🌍
𝐈 𝐟𝐥𝐲 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐟𝐫𝐮𝐢𝐭. 𝐈 𝐰𝐨𝐫𝐤 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐟𝐨𝐨𝐝, 𝐚𝐧𝐝 𝐟𝐨𝐫 𝐞𝐯𝐞𝐫𝐲 𝐬𝐢𝐧𝐠𝐥𝐞 𝐦𝐞𝐚𝐥 𝐲𝐨𝐮 𝐞𝐚𝐭.
𝐁𝐮𝐭 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐲𝐨𝐮𝐫 𝐡𝐞𝐥𝐩, 𝐨𝐮𝐫 𝐰𝐨𝐫𝐥𝐝 𝐢𝐬 𝐟𝐚𝐝𝐢𝐧𝐠. 𝐏𝐥𝐞𝐚𝐬𝐞, 𝐬𝐭𝐚𝐧𝐝 𝐮𝐩 𝐟𝐨𝐫 𝐦𝐞... 𝐚𝐧𝐝 𝐟𝐢𝐠𝐡𝐭 𝐟𝐨𝐫 𝐦𝐲 𝐥𝐢𝐟𝐞!
𝐈 𝐟𝐥𝐲 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐟𝐫𝐮𝐢𝐭. 𝐈 𝐰𝐨𝐫𝐤 𝐟𝐨𝐫 𝐲𝐨𝐮𝐫 𝐟𝐨𝐨𝐝, 𝐚𝐧𝐝 𝐟𝐨𝐫 𝐞𝐯𝐞𝐫𝐲 𝐬𝐢𝐧𝐠𝐥𝐞 𝐦𝐞𝐚𝐥 𝐲𝐨𝐮 𝐞𝐚𝐭.
𝐁𝐮𝐭 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐲𝐨𝐮𝐫 𝐡𝐞𝐥𝐩, 𝐨𝐮𝐫 𝐰𝐨𝐫𝐥𝐝 𝐢𝐬 𝐟𝐚𝐝𝐢𝐧𝐠. 𝐏𝐥𝐞𝐚𝐬𝐞, 𝐬𝐭𝐚𝐧𝐝 𝐮𝐩 𝐟𝐨𝐫 𝐦𝐞... 𝐚𝐧𝐝 𝐟𝐢𝐠𝐡𝐭 𝐟𝐨𝐫 𝐦𝐲 𝐥𝐢𝐟𝐞!
May 22, 2026 at 3:41 AM
"Varroa destructor with resistance to synthetic miticide treatments (including synthetic pyrethroids Bayvarol and Apistan and synthetic formamidine Amitraz, Apivar and Apitraz) has been detected in South East Queensland."
Many hives lost on the mainland but bees still seem okay on the islands. 🤞
Many hives lost on the mainland but bees still seem okay on the islands. 🤞
HONEYBEE DIE-OFF found to be due to bee virus spread by parasitic mites that have developed resistance to chemicals used to control them.
USDA study shows that Amitraz no longer appears to be effective against Varroa mites. Honeybees could be in "death spiral" w/o new remedies tinyurl.com/47ju2bpy
USDA study shows that Amitraz no longer appears to be effective against Varroa mites. Honeybees could be in "death spiral" w/o new remedies tinyurl.com/47ju2bpy
‘Could become a death spiral’: scientists discover what’s driving record die-offs of US honeybees
Experts scrambling to understand losses in hives across the country are finally identifying the culprits. And the damage to farmed bees is a sign of trouble for wild bees too
tinyurl.com
July 8, 2025 at 10:12 PM
HONEYBEE DIE-OFF found to be due to bee virus spread by parasitic mites that have developed resistance to chemicals used to control them.
USDA study shows that Amitraz no longer appears to be effective against Varroa mites. Honeybees could be in "death spiral" w/o new remedies tinyurl.com/47ju2bpy
USDA study shows that Amitraz no longer appears to be effective against Varroa mites. Honeybees could be in "death spiral" w/o new remedies tinyurl.com/47ju2bpy
Varroa amitraz resistance is now established in several places in the world. With no obvious replacement 'magic bullet' treatment on the horizon, IPM techniques and work towards natural resistance are more important now than ever: www.nature.com/articles/s41...
Arising amitraz and pyrethroids resistance mutations in the ectoparasitic Varroa destructor mite in Canada - Scientific Reports
Scientific Reports - Arising amitraz and pyrethroids resistance mutations in the ectoparasitic Varroa destructor mite in Canada
www.nature.com
January 12, 2025 at 12:28 PM
Varroa amitraz resistance is now established in several places in the world. With no obvious replacement 'magic bullet' treatment on the horizon, IPM techniques and work towards natural resistance are more important now than ever: www.nature.com/articles/s41...
22% seems to be last years losses in the UK:
www.nationalbeeunit.com/bee-health-i...
Most of that will be small scale, non commercial beekeepers I'd suggest. But 20-25% seems to be the general norm. No SHB but plenty of varroa, Amitraz is sill uncommon treatment wise but getting more popular.
www.nationalbeeunit.com/bee-health-i...
Most of that will be small scale, non commercial beekeepers I'd suggest. But 20-25% seems to be the general norm. No SHB but plenty of varroa, Amitraz is sill uncommon treatment wise but getting more popular.
NBU surveys » APHA - National Bee Unit - BeeBase
www.nationalbeeunit.com
December 10, 2024 at 10:59 PM
22% seems to be last years losses in the UK:
www.nationalbeeunit.com/bee-health-i...
Most of that will be small scale, non commercial beekeepers I'd suggest. But 20-25% seems to be the general norm. No SHB but plenty of varroa, Amitraz is sill uncommon treatment wise but getting more popular.
www.nationalbeeunit.com/bee-health-i...
Most of that will be small scale, non commercial beekeepers I'd suggest. But 20-25% seems to be the general norm. No SHB but plenty of varroa, Amitraz is sill uncommon treatment wise but getting more popular.
"nearly all the dead colonies tested positive for bee viruses spread by parasitic mites. Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal." share.google/xfaKC5mmt8FW...
Scientists identify culprit behind biggest-ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
share.google
July 1, 2025 at 8:07 PM
"nearly all the dead colonies tested positive for bee viruses spread by parasitic mites. Alarmingly, every single one of the mites the researchers screened was resistant to amitraz, the only viable mite-specific pesticide—or miticide—of its kind left in humans’ arsenal." share.google/xfaKC5mmt8FW...
www.science.org/content/arti...
62% commercial honey bee colonies in US died last year
all colonies tested positive for bee viruses spread by parasitic mites
every mite researchers screened was resistant to amitraz, the only viable mite pesticide of its kind left
Bees key for food supply
62% commercial honey bee colonies in US died last year
all colonies tested positive for bee viruses spread by parasitic mites
every mite researchers screened was resistant to amitraz, the only viable mite pesticide of its kind left
Bees key for food supply
Scientists identify culprit behind biggest ever U.S. honey bee die-off
USDA research points to viruses spread by pesticide-resistant mites, indicating a worrying trend
www.science.org
July 10, 2025 at 9:57 PM
www.science.org/content/arti...
62% commercial honey bee colonies in US died last year
all colonies tested positive for bee viruses spread by parasitic mites
every mite researchers screened was resistant to amitraz, the only viable mite pesticide of its kind left
Bees key for food supply
62% commercial honey bee colonies in US died last year
all colonies tested positive for bee viruses spread by parasitic mites
every mite researchers screened was resistant to amitraz, the only viable mite pesticide of its kind left
Bees key for food supply
‘Could Become a Death Spiral’: Scientists Discover What’s Driving Record Die-Offs of US Honeybees
@us.theguardian.com
MITES: All beekeepers in the USDA screening used amitraz, a pesticide widely used in the sector to get rid of mites. But the research showed all mites tested were resistant to it …
@us.theguardian.com
MITES: All beekeepers in the USDA screening used amitraz, a pesticide widely used in the sector to get rid of mites. But the research showed all mites tested were resistant to it …
‘Could become a death spiral’: scientists discover what’s driving record die-offs of US honeybees
Experts scrambling to understand losses in hives across the country are finally identifying the culprits. And the damage to farmed bees is a sign of trouble for wild bees too
www.theguardian.com
July 8, 2025 at 4:05 PM
‘Could Become a Death Spiral’: Scientists Discover What’s Driving Record Die-Offs of US Honeybees
@us.theguardian.com
MITES: All beekeepers in the USDA screening used amitraz, a pesticide widely used in the sector to get rid of mites. But the research showed all mites tested were resistant to it …
@us.theguardian.com
MITES: All beekeepers in the USDA screening used amitraz, a pesticide widely used in the sector to get rid of mites. But the research showed all mites tested were resistant to it …