CropMonitor: Septoria predictions for the week beginning 13 May
At the Live Monitoring sites, crop growth stages varied from GS30 to GS32, mirroring the range reported on farm. At some sites development has accelerated in response to the warmer temperatures, but overall progress has remained relatively slow.
Septoria tritici
Visible Septoria levels vary from negligible to severe, depending on location. With little rainfall in many areas, a low weather risk was recorded in most regions. The disease risk is typically fairly low, but a bit higher in some areas towards the south and west.
Yellow rust
Yellow rust has now been found at one site (Caythorpe in Lincolnshire) and in one variety (the highly-susceptible Oakley). It was not seen in any other variety or at any other site. Nevertheless, a medium weather risk was recorded at over half of the weather stations in many regions, and the disease risk is high for very susceptible varieties and moderate for others that are susceptible in nearly all regions. In the south-east, the risk is a little lower.
Brown rust
Brown rust was not detected at any of the sites, and the disease risk continues to be low.
Mildew
Mildew is now established at two sites. At Caythorpe six varieties have developed mainly slight infections, but at Telford levels have increased and are moderate in 10 varieties. However, the weather risk was low in most areas this week and, with the exception of the north-west region, the overall disease risk is still relatively low.
