BASF Agricultural Solutions UK

Yellow rust remains key focus at T0

Dr Jon Helliwell, Business Development Manager

Yellow rust remains a key focus at the T0 timing. Yellow rust epidemics are generally associated with new race emergence, with over-wintered infections producing disease foci by the spring.

The latest UKCPVS results will be published in March and given the fluid nature of varietal resistance and the continued challenge of knowing exactly when adult plant resistance will kick in, it is crucial to keep active yellow rust out of crops.

BASF CuraCrop monitoring showed that approximately 25% of crops nationally had some degree of yellow rust DNA in the perceived high-pressure year of 2020, although this was only half of the level of Septoria DNA infection in the low-pressure years of 2018 and 2019.

Whilst frost is known to kill sporulating mycelium, which will be of some comfort given the recent cold weather experienced nationally, early eradication based around a T0 application of tebuconazole should be considered in high risk scenarios. Later in the program, Xemium®, Revysol® and F 500® all have activity on yellow rust at different stages of the lifecycle and should be considered core components of a disease control strategy.

Strong yellow rust activity in a high-pressure scenario, on the leaves to which chemistry was applied. Early control prolonged green leaf area and built yield:

RGT Skyfall in Herefordshire (Leominster) – Photographs taken on 29/06/2020. Single application only leaf 3 at the T1 timing, no other fungicides applied.

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