Introduction
As we move into spring 2026 we are urging our clients to stay alert to a growing Nematodirus spring warning. The latest 2026 Nematodirus Hatching Forecast has now gone live, offering a crucial early‑warning system to help YOU protect vulnerable lambs during turnout season.
With temperatures rising and lambing well underway, the conditions are aligning for what could be a challenging season. Understanding the forecast, regional risk and management strategies is essential for preventing disease, growth setbacks and unnecessary losses.
1. Warmer Spring Weather Is Raising the Threat
The behaviour of Nematodirus battus makes spring temperature changes particularly impactful. Eggs overwinter on grazed pasture and hatch rapidly once temperatures consistently exceed 10°C—a threshold that we are already approaching as early spring mild spells develop.
The clinical team at Severn Edge Farm warn that this combination of better weather and increased lamb turnout onto contaminated pasture is exactly what heightens the risk of a sudden mass hatch, potentially leading to severe scour, dehydration and rapid decline in young lambs.
2. The 2026 Forecast Shows Earlier and Faster Hatching Potential
According to the Sustainable Control of Parasites in Sheep (SCOPS) group, the 2026 Nematodirus Hatching Forecast includes several improvements designed to give UK farmers clearer, more actionable insights.
These include:
- A daily updated interactive map based on data from 140 weather stations across the country
- Enhanced colour‑coded risk indicators
- New symbol shapes marking when peak hatch has passed
- Additional guidance under each warning category
- A new explainer video plus recorded webinars to help you interpret the tool more effectively
The forecast highlights how much risk can vary from year to year—sometimes by several weeks—reinforcing the need for continuous monitoring as we progress into spring.
3. Why the West Midlands Needs to Pay Particular Attention
While Nematodirus risk is a UK‑wide issue, farmers in the West Midlands face specific pressures:
- The region often experiences early mild spells, speeding up egg development
- A high density of lambing flocks means many pastures carry overwintered eggs from last year’s lamb groups
- Mixed elevations across the region create microclimates—fields at different altitudes may peak at different times (every 100m increase in altitude can delay hatch by around seven days)
As turnout increases in March and April, young lambs aged 6–12 weeks—the most susceptible age group—will be hitting pasture right at the time larvae may be emerging. A useful document by Queen’s University Belfast provides additional information on the risks.
4. Understanding the Disease Risk and Impact
Heavy Nematodirus infections can overwhelm lambs quickly. Because disease occurs during the pre‑patent period, faecal egg counts (FECs) are not always reliable indicators of risk. This makes forecast‑based decision‑making even more essential.
Clinical signs often include:
- Sudden onset diarrhoea
- Dehydration
- Rapid weight loss and growth checks
- Occasionally death in severe cases
The 2026 forecast acts more like a “nowcast,” using accumulated temperature data to show where risk is imminent or already underway.
5. Actionable Steps for Farmers This Spring
Farmers in the West Midlands should take a targeted, proactive approach:
A. Regularly Check the SCOPS Forecast
The interactive map provides real‑time assessment of risk for your closest weather station. Compare multiple stations if your farm sits between altitudes or landscape types.
B. Assess Individual Lamb Group Risk
Before treating, SCOPS recommends assessing each group based on:
- Age (6–12 week‑old lambs most vulnerable)
- Grazing history of the field
- Stress factors (weather, nutrition, concurrent disease)
C. Consider Strategic Treatment or Grazing Adjustments
Options include:
- Moving lambs to clean or lower‑risk pasture
- Strategic early‑season anthelmintic treatment when high risk is indicated, check out our online shop for your worming needs
- Avoiding reliance on FECs for Nematodirus‑only decisions
D. Keep Monitoring as Conditions Change
With spring weather fluctuating, peak hatch timing may shift. Daily checks of the forecast help avoid being caught off‑guard by a mass hatch.
In Summary
The 2026 Nematodirus spring warning is clear: farmers—especially across the West Midlands—must stay vigilant as milder weather accelerates larval hatching and lamb turnout increases. The updated SCOPS forecast offers one of the most powerful tools for protecting lamb health this season, helping producers make informed decisions and minimise losses at a critical time for flock productivity.
By combining local knowledge, forecast data and targeted management, you can take control of the risk and ensure your lambs get the strongest possible start to the year. If you have any questions, need any advice or think that your stock may be suffering from Nematodirus this spring please give us a call on 01746 713911 or pop into practice.
