Wednesday, May 30, 2018

New race of downy mildew in spinach, Pfs: 17 identified and nominated by IWGP

Source: Plantum
A new race of the downy mildew pathogen (Peronospora farinosa f. sp. spinaciae = P. effusa), able to overcome the resistance of important spinach varieties, has been identified.
This isolate, first identified in Yuma, Arizona and labelled (UA1014) was characterized on a standard set of differential varieties. Isolates with the same reaction pattern have been found in numerous locations each year since 2014. After careful evaluation of the significance of this development to the spinach industry, the International Working Group on Peronospora (IWGP) has denominated this new race as Pfs: 17.

Bayer offers a number of commercially available Pfs:1-17 spinach varieties. This includes Hydrus, a medium-slow variety for warmer periods, Alcor with medium speed and Regor, a fast variety for cooler periods. Bayer can also offer Cursa, a slow variety for warm conditions and Serpens a medium speed variety, both are 1-6,8-17. All material shows a high cultural value.

Updated resistance information of the Nunhems spinach assortment can be found in the spinach crop tables on our local website:
More information

For more detailed information about Nunhems spinach varieties, their resistance patterns and slotting, please contact your local Spinach Sales Specialist.

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For more detailed information about Pfs:17 please download the official press release of Plantum
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