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Tasmania worms, flies and lice update - June 2021

Tasmania WormBoss Worm Control Programs

Tasmania WormBoss Drench Decision Guides

Sheep

Goats

Sheep

Goats

Perth: Paul Nilon, Nilon Farm Health (pandonilon@bigpond.com)

It’s a good deal wet, or at least wettish. There have been two reasonable floods past the back door in the past two weeks, and suddenly paddocks are difficult to negotiate. The east coast is really wet, which is some recompense for all the dry years, so at this time few of the sheep areas are deficient.

Worm wise things are hot. The only WECs from young merinos that are not high are the ones not done! We have had a few disasters wherein mobs of merinos have crashed over about a week. Beware, worms are about. Older sheep, particularly XB ewes are generally good with carry-over body condition keeping the worms at bay.

What to use:  It’s time for the annual decision on what to use prelambing. This is easy for the XB flocks: nothing or whatever short-acting drench that works.  The properties that have been stung with Haemonchus should use one of the newer products (monepantel or derqantel) unless they know that an abamectin triple works (i.e. you have done post drenching counts or have a recent — as in this year — DRT).

Merino ewes are more troublesome. Many clients’ weaners have done a good job contaminating some lambing paddocks. Moreover, some merino mobs have lost a deal of weight through the autumn.  So, if WECs show you have decent contamination, or if you have been drenching like a Kiwi in speedos, consider a long-acting for at least the youngest ewes, and any others lambing on contaminated paddocks or ewes that have lost body weight. Even the sainted who conscientiously “smart-graze” are falling in a bit of a heap so they will almost certainly need a pre-lambing drench (short-acting) if their ewes are lambing on SG paddocks.

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