CropMonitor: Septoria predictions for the week beginning 15 April

Farmers Weekly has teamed up with CropMonitor to bring the latest disease risk predictions across England and Wales.

As a result of the poor autumn conditions that delayed or prevented sowing, and the low temperatures in March that halted crop progress, only one of the Live Monitoring sites had reached GS30 this week, with others typically still at mid tillering.

On farm a wide range of growth stages exists. T0 fungicide applications to wheat crops were delayed, but have now been applied to earlier-sown crops. For many later-sown crops, growth stages will be severely concertinaed such that crops will not be treated until T1 (leaf 3 emerging).

Septoria tritici

Of the sites that have reported this week, visible septoria levels range from negligible to moderate, with site rather than variety having the most influence. Recent rainfall has been low, resulting in a low disease risk in most areas, but wetter weather in the last few days may help to revive septoria development.



Yellow rust

No yellow rust was found in any variety at any of the Live Monitoring sites that have reported this week. Although the weather risk has generally been low in most regions, there have been a few reports of the disease on farm and at this time of year yellow rust can appear quickly. So, while the overall disease risk is relatively low at present, the most susceptible varieties should be treated as being at moderate risk.

Brown rust

No brown rust was observed at any site this week, which is hardly surprising given how backward crops are, and the weather conditions to date. The current disease risk is very low.


Mildew was found at one of the Live Monitoring sites this week (Telford), in about half of the varieties (including the three most susceptible). The recent weather risk has been low, but late sown or backward crops are often more vulnerable to the disease. While the overall mildew risk is low, crops should still be monitored in situations where the disease frequently occurs.

CropMonitor is a free online service by FERA, HGCA and Bayer CropScience. For the latest risk of wheat disease in your region, go to the dedicated webpage.

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