Worm-Heat-Map-Latest-May

Good news as this region finally retreats from the highest category for the first time this year. However, we need to remember that April temperatures were still warm enough for these eggs to develop if they received adequate rainfall – as many would have done.  The eggs that develop to infective larvae in April present a source of infection through winter and into spring. Despite a reduction in average WEC, risk still remains with over 30% of counts still above 1000 epg. It has certainly been a tough worm season due to the good rainfall events across the region, so the imminent cold weather that limits barber’s pole worm development is eagerly anticipated.

Worm egg counts in the west of the region remain similar to last month, with the majority of counts less than 250 epg. Barber’s pole worm still appears to be creating a headache for some though, with 20% of counts above 750 epg. In the east of the region, the challenge remains high but variable. Over 200 samples were submitted from this region and they show a wide distribution with 25% of counts above 1000 epg and 50% under 250 epg. This highlights the need to be vigilant with testing over the autumn period.

Worm egg counts across southern NSW have risen from March, and again are higher in the east of the region. In the eastern zone, while 60% of WECs were below 250 epg, several high counts during the period are a timely reminder to maintain routine testing, especially of young sheep if feed is poor.  Testing in young sheep prior to onset of winter is also important to help manage production and health during this period.

The continued dry weather in Western Victoria continues to supress worm burdens, with all of western Victoria shown as green. Let’s hope the dry spell breaks soon and pastures recover. When it does, remember to test 4-6 weeks after the rains start. 

Low worm egg counts have been reported across South Australia, with 80% of WECs being less than 250 epg. While conditions have been dry, testing weaners regularly until the end of their second winter is recommended. Testing pre-lambing ewes is also still warranted with these conditions. While it has been dry, sheep struggling with condition score and on pastures with low feed are more at risk from worms due to decreased immunity.

The southern region WEC continues to rise, with the average WEC increasing from 433 to 770 epg following some much needed rainfall. With the majority of these worms likely to be black scour or small brown stomach worm, these counts suggest some sheep are losing productivity due to worms. April was a key time to be testing and treating ewes. Now is an ideal time to keep an eye on any hoggets, testing and treating if required. 

The central region continues to be dry and worm egg counts remain low in this district.

The low rainfall zone in eastern Tasmania returned back to green in April following a spike in WECs in March. The region has been struggling with below average rainfall for several months. Some worms must be finding moisture in the north, with the 2 samples submitted both showing WECs above 1000 epg.

We hope you find these updates valuable.  Let us know what else you would like to see and get those samples submitted!

Rainfall-Map-Latest-May