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Victoria worms, flies and lice update - October 2015

VIC WormBoss Worm Control Programs

VIC WormBoss Drench Decision Guides

Hamilton: Andrew Whale, Livestock Logic (

Livestock Logic Key Recommendations

  • Summer drench planning and strategy starts now
  • Do a supplementary feed budget as soon as possible

Dry weather in the south west since August has given us a terrible spring with pasture growth rates well below normal levels. While rain now would be welcome while pastures are still green, we are realistic about drought conditions. Hamilton has received less than 75 mm of rain since August, which is one of the lowest on record. Those that have done feed budgets and are aware of the costs and grain required to get them through to the autumn break will be better placed to handle a long summer period.

Egg counts have been relatively stable over the last few months. As we have stated over the last month or two, it is essential to ensure worms are not impacting on animal weight gain with a long summer ahead.

November egg counts are essential, particularly in a year like this. If egg counts are high in November then drenching should be undertaken immediately, if low then do not drench but re-test in December. If moderate then there is no need to re-test in December, just pencil in a drench for a month’s time. Delaying the drench improves its effectiveness as larval pickup post early December this year will be minimal.

Long acting products should be avoided at weaning this year, as they will be more selective against resistance compared to years with continued spring rain.

Figure 1: % Egg counts over 200 epg each month for all sheep classes
Figure 1: % Egg counts over 200 epg each month for all sheep classes
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