Leaf layer tested: Newest leaf layer
Summary: New results from Ireland and Scotland adds to the National Snapshot view of disease pressure. Low levels of Septoria tritici are been detected at more locations across the country, including in East Anglia. Meanwhile, there is still no yellow rust detected via the project so far this season.
Septoria tritici is now being recorded in more of the leaf samples this month compared to January. As expected, this is primarily fields in the West and South of the country but also at Ella Crawford’s site in Suffolk where she has partnered with Edward Vipond.
Their results from a crop of LG Skyscraper (5.1) drilled on 20th October show low levels of Septoria tritici whilst there was no disease present in KWS Firefly (6.8) drilled on the same day.
We’ve also received the first results from Ireland, which are all zero apart from a relatively low levels of Septoria tritici in a field of Graham (6.8) at, Balyraggert, Co Kilkenny.
Having been hampered by snow in January, the first results from Grant Reid’s partner farms in Scotland are both positive for Septoria tritici. Leaves were sampled from the newest leaf layer of LG Sundance (7.9) drilled on 16th September and Skyscraper (5.1) drilled on 8th September.
Interestingly, the LG Sundance has a slightly higher level of disease compared to the Skyscraper highlighting the value of the Rapid Disease Detection tool to understand nuances in disease levels beyond the basic factors of drilling date and variety.
Over in the West of England at Gareth Bubb’s Herefordshire site, Septoria tritici levels have advanced since January. Manager Mark Wood opted for RGT Wolverine (5.3) for its BYDV resistance and Extase (8.0) with Septoria being the prominent disease threat.
RGT Wolverine (5.3) is a useful variety in the battle against aphids but a 14th September drilling date and low Septoria and yellow rust ratings mean it will need careful monitoring. Testing also detected Septoria tritici in Extase (8.0) for the first time this season. The crop being drilled on 26th September.
Yellow rust: Whilst yellow rust has been observed on lower leaves of crops, so far Rapid Disease Detection testing of the newest leaf layer isn’t detecting any yellow rust.