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Winter wheat is having a hard time with the cold spring weather
Current disease situation in winter wheat (3) - 2017
The disease pressure has not increased in recent weeks. Septoria remains at the bottom of the crop, but had little chance to expand further due to the dry, poor weather. Yellow rust is also present in the sensitive varieties, but does not spread. Brown rust was not found anywhere in the 3rd monitoring. Mildew is mainly found in sensitive varieties in the south of the Netherlands.
The cold stress in the crop is striking. The wheat plants respond to the frosty days of the second half of April. This cold stress is visible everywhere in the numerous yellow leaf spots, especially on the leaf tips. Spraying with growth inhibitors or fertilizers can amplify this stress. For smooth growth, it is now important that the weather warms up quickly.
Under these circumstances, it is important to keep the wheat healthy. In recent days it has rained in many places, such as on the experimental farm in Westmaas (see fig. 3). This precipitation may have given septoria infections, which will only become clearly visible in 3 weeks. The Bayer advisory system indicates that the weather has and will continue to give opportunities for yellow and brown rust these days (see fig.4). In short: keep your crop healthy with the right combination of T1 and T2 spraying.
Of course we recommend our Xpros: Aviator and Skyway!
With this we conclude our 2017 disease monitoring of practice plots. We will of course continue to closely monitor developments in practice. If relevant, we will certainly report on this on our Bayer website.
fig. 1: Bayer Disease Monitoring Winter Wheat. Average disease pressure in week 18, 2017 compared to 2016.
fig. 2: The degree of damage in wheat per disease in 2017 compared to 2016.
Fig.3: May 3rd, a wet day in the Netherlands. Our septoria timers register the risk of septoria infections. In the photo the wet wheat on the Westmaas experimental farm.
fig. 4: Expert disease pressure cards for yellow and brown rust in winter wheat dated 4 May 2017.
