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Victoria worms, flies and lice update - February 2015

VIC WormBoss Worm Control Programs

VIC WormBoss Drench Decision Guides

Hamilton: Andrew Whale, Livestock Logic (

Livestock Logic Key

Egg counts are remaining low and with low egg counts to confirm no production loss and minimal pasture contamination drenching requirements in later part of summer can be reduced and drenches conserved.

Summer appears to have reappeared in the south west and the small amounts of green feed that were present in areas north of Hamilton are quickly disappearing, although south of Hamilton there are parts that have reasonable green feed/pick from perennials, that would really respond to further rain.

The below chart would suggest that egg counts have not risen on the back of the cooler conditions and the rainfall that was experienced throughout January. This should be somewhat pleasing for producers, it is important to note, however, that this is written on the 18th Feb so we may yet still see some increases in egg counts towards the end of February.

For most this will mean that there is an opportunity to avoid a 2nd summer drench in many adults, as always, they must be tested to have low worm egg counts, not assumed.

Graph 1: Percentage of Sheep Requiring Drenching from Livestock Logic Laboratory
Graph 1: Percentage of Sheep Requiring Drenching from Livestock Logic Laboratory

Benalla: Tricia Veale (

There have been very large fires in this area due to very hot and dry conditions and sudden storms of lightening. Many hectares and many animals have been destroyed.

The wonderful support of the CFA and many people who have given help to the affected farmers is remarkable. Many locals have been assisting with re-fencing and providing fodder. The water levels in the dams are also now rapidly falling.

 In this area, there was 58 mm of rain in January and 14 mm so far for February.

Now is the usual time for the second summer drench, but it is very important not to give this drench unless it is really necessary. Drenching when it's not needed will help the worms to get used to that chemical, which allows drench resistance to begin. This is because you kill all the susceptible worms in the population and allow the drench resistant ones to survive. It's very important to test animals to determine the worm burden first.

It is a serious mistake to use one type of drench only every year for a few years. This actively encourages the appearance of resistant worms. So ensure that you make a plan of your drenching regime, which includes drench rotation, to make the efficient drenches last as long as possible on your property.

If Barber’s Pole worms, Haemonchus, have been present on your property, then keep an eye out for these. Get a larval culture done to identify the species of worms present.

For February 2015 state outlooks, please follow the links below:
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