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Drench resistance

Use refugia to prolong drench life
What is refugia? Refugia is simply the Latin term for ‘in refuge’. Click here to view this article »
Further reports of monepantel resistance
Many of you will remember that we reported on a case of Monepantel (Zolvix) resistance in goats in New Zealand. Here Steve Love, NSW DPI, Armidale furthers the story. There are good lessons for us all in this. Click here to view this article »
Monepantel-resistant goat and sheepworms, and drench-resistant cattle worms
Sadly the first confirmed case of resistance to Zolvix (monepantel (MPL)) in the field has been reported. Click here to view this article »
National Drench Resistance – should you be concerned?
A recent nationwide survey1 was conducted in response to the need for up-to-date information on drench resistance in the Australian sheep industry. Click here to view this article »
Drench resistance - so what?
We have all heard about drench resistance. So what? Here are some thoughts on the matter. Click here to view this article »
How does drench resistance come about?
Resistance of worms to drenches is a genetic trait. Click here to view this article »
Don't import drench resistance
There are two ways you can get drench-resistant worms: breed your own and/or buy someone else's. Here is some advice on quarantine treatments from the revised material developed for the new WormBoss website. Click here to view this article »
First confirmed case of resistance to new drench in Australia—what does it mean?
A case of resistance to the sheep drench Zolvix® (monepantel (MPL), Novartis) was recently confirmed on a goat farm in NSW. This appears to be the first and only confirmed occurrence in any livestock in Australia. Click here to view this article »
Early thoughts on partial flock treatment in summer rainfall regions
Many sheep producers have heard of the concept of leaving a proportion of a mob of sheep untreated as a means to slow the development of drench resistance. It is successful in winter rainfall areas, but will it suit summer rainfall areas? Click here to view this article »
Reduced efficacy of new drenches? Be alert, not alarmed.
Recently there have been a small number of confirmed reports of reduced efficacy, including resistance, involving new sheep drenches in Australia. What should sheep producers do? Click here to view this article »
Drench resistance—a big cost that flies under the radar
Drench resistance is a major problem to sheep producers for two main reasons: it is costly, and it’s mostly invisible. Click here to view this article »
Drench rotation does little to combat drench resistance
Rotation between different drench groups does not slow development of drench resistance and should not be used at the expense of the other highly effective practices. Click here to view this article »
Reversion: Do worms become susceptible again to drenches not used for years?
What happens to the effectiveness of a drench group when it hasn’t been used for many years? Will the effectiveness increase, and if so, for how long will the benefit last? Click here to view this article »
Summer drenching in Mediterranean climate regions: two paths to sustainability
The “summer drenching” program has long been a mainstay of sheep worm control in winter rainfall regions. However, in areas where summers are very hot and dry, it is also a major causal factor for drench resistance, with a consequent reduction in the long-term effectiveness of worm control. Click here to view this article »