Frequently asked questions

If you wish to submit a question about Butox® and the control of ectoparasites please go to Ask the Expert and submit your query.

General

Which types of insecticides are the best for stable wall treatments, organophosphates or synthetic pyrethroids?

Both chemical classes can be recommended. Organophosphates are facing more resistance problems than Synthetic Pyrethroids. Butox® EC 50 can be used for wall or ground spraying. For the treatment of the environment, a hot or cold fogging application with OP or SP is recommended.

Does Butox® provide adequate protection on the udder or other parts of the body where the skin is thinner?

There is no published data available on this topic yet. It is true that these areas contain a lower concentration of lipids. Despite this, Butox® shows good activity against midges even if their favorite biting zones are those “thin-skinned” areas. The udder area has to be considered as a higher “risk zone”, due to the fact that it is cleaned twice a day.

What is the duration of protection after topical use of a solution of Butox® 50 EC on cattle and sheep?

  • Lice and mites one application every six month
  • Flies one application every6-8 weeks depending on the degree of infestation, fly species and weather conditions
  • Ticks - treatment should be repeated according to level of infestation.

In case of rainy weather, how long should I wait after Butox® application to release my animals to ensure that the Deltamethrin is not washed away?

Deltamethrin is a lipophylic substance (not soluble in water) and should therefore not be rinsed off to any significant degree by rain.

I want to apply/ have just applied the product but it is raining/ has just rained/ is about to rain. Do I have to wait until the cattle are dry/ will it be OK if it rains on them afterwards?

Deltamethrin is a lipophilic substance (not soluble in water) and can therefore not be rinsed off to a significant degree by rain.

I want to apply/ have just applied the product but it is raining/ has just rained/ is about to rain. Do I have to wait until the cattle are dry/ will it be OK if it rains on them afterwards?

Deltamethrin is a lipophilic substance (not soluble in water) and can therefore not be rinsed off to a significant degree by rain.

In Spain, Butox® has a registered duration of protection of 4 weeks against ticks and 8-10 weeks against fly. W have however received some phone calls from vets / farmers that the duration against flies (and with less frequency against ticks) is shorter. Why is this ? Is fly resistance against deltamethrin a real problem?

In single cases, depending on the application method, herd conditions and weather conditions a shorter duration is possible. The stated protection times for flies and ticks were confirmed in our trials. If resistance was a problem, there would be no efficacy from the beginning of the period. In Europe there have been no resistance problems at all for the claimed parasites.

Why must Butox® be re-applied every 4 weeks to control midges but only every 8-10 weeks for other flies?

In general global Science is only at the beginning of its Culicoides research and in defining control measures. Re-application every 4 weeks is current knowledge as a result of field testing. Additionally it has to be mentioned that although Culicoides and “other flies” belong to the same family (Diptera) they form different sub-families with their own individual biology.

Will Butox® also control blow-fly strike on sheep? If not can I apply another product that will at the same time?

Blow fly is not a registered claim for any Butox® formulation and would mean an off label usage. We do not have any data confirming efficacy of Butox® against blow fly.
Avoid the simultaneous use of any other ectoparasite as interactions cannot be completely ruled out(e.g. organo-phosphorous insecticides).

Is it necessary to treat lambs with the same dose as sheep (same for goat lambs and dwarf breeds)?

Goats are not a registered target species. We don’t have data on tolerance in goats. No age restrictions apply to the use of Butox® 7.5 pour on in sheep.

Butox® has a long duration of activity (10 weeks). How come I see flies return after 3 weeks?

In rare single cases this might be true, depending on weather conditions, herd conditions and application methods.

Can I use Butox® to prevent Myasis in sheep?

From scientific point of view this should be possible as the female flies are repelled by any Butox® formulation. We do not however have any data on the preventive effect of any Butox® formulation against Myasis. Butox® does not have any larvicidal effect, so larvae which are already beneath the skin will not be affected and have to be treated with an endectocide. Important: Do not use any Butox® formulation directly on skin lesions.

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