Nematodirus Forecast 2017
Risk at a Glance
IMPORTANT: Click on the weather station closest to your holding for more detailed information and advice on how to protect your lambs. The risk on your holding may differ from the nearest weather station.
Very high risk
The forecast predicts the hatch date for Nematodirus based on temperature data from 140 weather stations throughout the UK and should be used in combination with your grazing history to assess the risk of Nematodirus infection in your lambs. More information on how your grazing history affects risk can be found here and by clicking on the nearest weather station to your holding in the map above.
1. Locate the stations closest to your holding Use knowledge of your farm and the surrounding area to choose the weather station that is most relevant to you.. In most cases this will be the nearest station, but if, for example, there is a large difference in the height above sea level between your holding and the nearest weather station, then look to see if another station further away may be more representative. (If you click on a station it will give the height above sea level). Alternatively take a view across a combination of stations in your area.
2. Click on the stations for more detailed information on the current risk level, guidance on what to do next, and information on when the forecast was last updated.
3. Carry out a risk assessment and take action if needed Nematodirosis can strike very quickly. You can’t afford to have a ‘wait and see’ policy and because the damage is done by large numbers of immature larvae that are not producing eggs, Faecal Egg Counts (FECs) are not a reliable indicator of the risk. Rapid action is often required and this has to be based on a risk assessment and the forecast for your area.
The main risk factors to consider are:
|Are your lambs grazing pasture that carried lambs last spring?|
|If you tick above then one or more ticks below and your lambs are at risk:|
|Are they old enough to be eating significant amounts of grass? (generally 6 –12 weeks of age but may be younger if ewes are not milking well)|
|Do you have groups where there is also likely to be a challenge from coccidiosis? For example mixed aged lambs are a higher risk|
|Has there been a sudden, cold snap recently followed by a period of warm weather?|
|Have you got lambs that are under other stresses e.g. triplets, fostered, on young or older ewes.|
Avoid infection: Move at risk lambs (see risk assessment above) to low risk pastures (i.e. pasture that WAS NOT grazed by lambs the previous spring).
Treatment: If you cannot avoid high risk pasture grazed by lambs the previous spring and decide you need to treat for Nematodirus, then SCOPS advises farmers to use a white (1-BZ) drench. (See SCOPS website or click below for a list of products:
These are still highly effective against this parasite on most farms and suitable for young lambs. Check that treatment is effective by taking a FEC 10 days after treatment. Remember it may be necessary to treat lambs more than once depending on the spread of ages in a group and subsequent weather conditions.