QLD WormBoss Worm Control Programs
QLD WormBoss Drench Decision Guides
Preparing the lambing paddock is the next item on the sheep worm control calendar in southern Queensland. The first requirement for a lambing paddock is that it should have good feed and adequate shelter. Secondly, it should be low-worm risk i.e. few larvae on pasture waiting to infect the new lambs.
Information that will help you to decide about the likely level of worm contamination on a pasture is the worm burden of sheep currently grazing the paddock and the paddock’s grazing and rainfall history back to the last rains. On many properties, the last rains initiated egg hatch and subsequent infections of sheep contributed to larvae accumulating on pasture. It was thought "too dry" for worms and sheep weren’t drenched.
The good thing about barber’s pole is that once egg hatching has been initiated it cannot be delayed, and the resultant larvae quickly emerge onto pasture. If it’s cold and dry on pasture, all the better.
Some detail: At about 20°C and relative humidity of 60%, spelling a paddock for 30 days will reduce the larval population by about 55%. This reduction may seem significant, but it is unlikely to help your worm control. A reduction of over 90% is needed for an improvement in worm control to be achieved. This will generally take 5-6 months in cooler weather.
In the months leading up to lambing do any combination of these:
The weather continues dry for most people and it is getting colder, so barber’s pole should be taking a break.
Now is the time to be putting effort into low worm risk paddocks for next season.