New race of downy mildew in spinach

This race has been reported in multiple instances across Europe and the USA in 2023, leading to its designation by the IWGP on 13 May 2024.

Rijk Zwaan’s resistant spinach varieties

“By breeding varieties with strength against leaf and soilborne diseases, we can provide security for growers – both in Australia and worldwide,” Rijk Zwaan Australia Spinach Crop Specialist, Rob Phillip said.

“As the spread of Pe: 20 is so far limited to Europe and USA, it is not of major significance to Australian growers. However, we pride ourselves on being prepared and we are pleased to offer varieties that show resistance to this latest denomination,” Rob said.

For the most up-to-date information on varietal performance and mildew resistances, we recommend growers speak to their local sales representative.

Integrated resistance management

Rijk Zwaan advocates an integrated approach to resistance management; resistant varieties are a large part of this, but disease controls and hygiene measures are also important to help prevent the development of new mildew races. Proper hygiene practices, such as removal of debris and diseased plants, will reduce the spread of mildew in crops.

About IWGP

Located in the Netherlands and administered by Plantum, the IWGP consists of representatives from major international seed companies, Naktuinbouw and various research centres.

The IWGP continuously monitors the appearance of new strains of the pathogen and promotes clear and consistent communication of resistance breaking races of mildew. Using common differential sets, IWGP members monitor outbreaks of mildew, and the appearance of new isolates.

Read Plantum’s media release here Denomination of Pe: 20, a new race of downy mildew in spinach (plantum.nl)