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  1. Hi Tom, Thanks for the acknowledgement. If you feel you have an issue with Bayvarol can you please contact us so we can investigate. I posted our contact details earlier in the thread but have re-quoted then above so they are handy. We will investigate thoroughly including testing mites and strips. Bets regards George
  2. Hi Alastair and All involved in this discussion thread. Thanks for drawing this to our attention. We take claims of lack of efficacy very seriously and ask for the co-operation of anyone who is experiencing suspected lack of efficacy. Late last year I posted our contact details in the event of a suspected lack of efficacy, but they buried in an old thread, so here they are again. Contact the Bayer Pharmacovigilance Manager:- 1. Phone on 0800466121, select option 2 2. E-Mail nzanimal.drugsafety@bayer.com 3. Send a letter to Bayer NZ Ltd, Animal Helath, 3 Argus Place, Hillcrest, Auckland 0627 Attention:- Pharmacovigilance Manager Once we have your details, we will plan a thorough investigation with you. Best regards George
  3. Sorry I missed citing you to Alastair. We recommend rotation between amitraz (Apivar) and either flumethrin (Bayvarol) or fluvalinate (apistan) for exactly this reason. The objective of rotation is to attack the parasite with a different mode of action to avoid prolonged exposure to the same mode of attack which increases the chance of resistance developing. There are parallels with sheep and cattle drenches and pour-on's. Overuse of one mode of action to kill worms over time had led to the development of resistance, new active ingredients with new modes of action were needed to control worms, and without proper rotation between families they also have resistance challenges. There are now worms resistant to 3 different modes of action. The global market for sheep/beef/dairy parasite control is worth Billions of dollars so there is significant investment going in to developing new products / new modes of action. The global varroa control market is much smaller, around $50 million, so there is less investment going in to creating new control products. The bottom line is Beekeepers need to carefully manage what we have available today, through using products according to their label recommendations - number of strips, placement in the hive, timing of treatments and duration of treatment - and by rotating between products with different modes of action - spring & autumn - to prolong their effectiveness.
  4. Hi Alastair. This is beyond my knowledge but I have asked the question of our bee scientists at the Bayer Bee Care centre in Germany and will post their response when I receive it. Sorry I can't be of more help right now.
  5. Yes, the statement applies to NZ. @JohnF has provided a good summary above. We are proactive in this area. We have just completed a study of NZ varroa with samples taken from a significant number of different hives and across a wide geographic area, to see if there is any sign of the known genetic mutations in the DNA. We don't have the results yet, but I will share them here when we have them. We are working to set up on-going monitoring, and we are especially interested in getting samples of mites from hives where there is a claimed lack of effectiveness of treatment. All of this is relative to Bayvarol. You would need to ask the suppliers of other products what they know, and what they are doing in this area in relation to their own products.
  6. @tommy dave, I'm here. We are more than comfortable discussing Bayvarol with NZ Beekeepers. Sorry I haven't posted recently. I have been busy working hard on resupply of Bayvarol. I can't speculate about the reasons why some mites are been seen in hives treated with Bayvarol. @frazzledfozzle is right, 4 strips per hive should do the job. It takes time for the active ingredient on the strips to spread around all the bees and any varroa in the brood cells won't be exposed to the active until they emerge so it is possible that varroa will still be seen early in a treatment. Bayer takes any claims of lack of effectiveness of Bayvarol very seriously and it is our duty as the holder of the registration under the ACVM act to investigate all reports of lack of effectiveness as thoroughly as possible, so anyone who has concerns should contact Bayer on our Drug Safety number 0800 266221 or email nzanimal.drugsafety@bayer.com or post their contact details and we will be in touch with to arrange to visit to investigate. This isn't an attempt to take a discussion offline, but we can't properly investigate reports in an online forum. We can even take varroa samples and have them genetically tested for resistance. To date none has been found. We share the findings of all investigations with you, so if you want to post the outcomes to bring it back into the forum you can. We need Beekeepers cooperation so I urge anyone reading this, who has a complaint, to get in touch.
  7. Bayer


    You're right about resistance developing in the US but it's still sold there, and also in Canada and Europe. The comb contamination challenge is manageable. It's been used for over 20 years in Europe and wax residues are still below the MRL's set by EU regulators. It will take too long to explain here, but I'm happy to chat about it some other time. Contact me at George.reeves@bayer.com
  8. Bayer


    There are a very limited number of synthetic varroa control products available worldwide. The main active ingredients are:- Flumethrin (Bayvarol) Tau-Fluvalinate (Api-Stan) Amitraz (Apivar) Coumaphos (Checkmite) Bayer sells more Checkmite in most other markets. Europe and North America are main markets for Checkmite.
  9. Bayer


    Hive health is multi factorial and there are many potential reasons for hive collapse. Bayvarol is very widely used and its use prior to hive collapse can lead to the assumption that Bayvarol is the cause. We are keen to hear from anyone who believes Bayvarol has not been effective. We will investigate it with you. We do this with all the animal health products we sell. We know from years of experience in handling claims of lack of effectiveness of our products, that prior treatment with our products is seldom the cause of a subsequent issue.
  10. Bayer


    No, this affects all Bayvarol production, but New Zealand is by far the biggest market for Bayvarol. We have tried to get unaffected Bayvarol stock from other markets but there isn't any available.
  11. Bayer


    Hi Everyone I'm George from Bayer. I see some of you have been asking for someone from Bayer to join the discussion so here I am. Thanks to those who gave me access to the site. I have read your posts and understand your concerns so hopefully I can help with some of them. I will start by saying that all Bayvarol that Ecrotek have supplied to date has been entirely fine so there should be no concerns with any Bayvarol you have on hand or have used already. Bayer has very high quality standards which include testing of product from all batches before it is released for sale. About a month ago, we had 2 batches fail quality release in Germany, where it is made. The issue was too much active ingredient on the strips. Too much active ingredient could have a potential impact on hive health and honey residues. We take the quality, safety and effectiveness of our products very seriously, so we cannot release product for sale that is not within the normal product specification. When the initial batches failed, we implemented a contingency plan to make more and get it here via airfreight. At that time we had enough stock to meet demand, until the new product arrived. Last week we were told it had also failed quality release and we immediately informed Ecrotek. Ecrotek and Bayer plan stock well in advance, but the quality issue meant we had little remaining stock on hand. Ecrotek normally order stock from us as they need it so they had very little inventory also. It is Bayer's fault that Bayvarol is out of stock, not Ecrotek's We have identified the root cause of the issue, and have taken steps to fix it. The issue is due to new equipment that was recently put into our production line. All product that has been supplied in the NZ market to date was made before this change. Bayer stands behind the quality of all Bayvarol supplied to the NZ market since 2005. This is not a product recall situation. We are very sorry for the current out of stock situation. We are working extremely hard and with urgency to get new stock of Bayvarol back to market. We hope to be able to supply Bayvarol again by mid October. Going forward we intend to build much higher levels of safety stock in NZ to ensure continuous supply of Bayvarol to Beekeepers. If any of you would like to discuss this with me in person, please send me an email at George.reeves@bayer.com and I will get in touch. Kind regards George
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