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Host differential sets

Naktuinbouw can supply seeds of the following host differential sets:

For lettuce - Bremia lactucae

For spinach -  Peronospora effusa

For cabbage - Plasmodiophora brassicae

  • 4 host differentials
  • 1 unit = 200 seeds per host differential

What are host differential sets?

Host differential sets are sets of plant varieties or lines with different, well-characterised resistances to plant diseases. All resistances that are important in the market are preferably in the set separately. In fact, host differential sets lay the foundation for harmonising resistance claims.

The virulence pattern of pathogen isolates can be examined with a host differential set. Examination of virulence patterns may be necessary to validate a resistance test. Or to examine whether an unknown isolate belongs to a known race.

A comprehensive list of host differential sets can be found on the website of the International Seed Federation. These sets can be used in resistance breeding. Also, you can find explanation about resistance terminology on this website.

This picture shows a host differential set.

What is the importance of host differential sets?

Host differential sets are the key to breeding progress for the benefit of society.

Who can order host differential sets?

Any organisation that is involved in resistance testing or in monitoring of new isolates can order seeds of host differential sets at Naktuinbouw.

The differential sets are propagated by seed companies in collaboration with Naktuinbouw and Plantum. Seeds of host differentials are supplied free of charge. In return, we expect the implementation of ISF resistance terminology and feedback about monitoring.

Although there are practical restrictions on the amount of seeds, any request will receive serious consideration. A standard MUA (Memorandum of Understanding and Agreement) belongs to the normal procedure. Phytosanitary restrictions may apply to the import of seeds, depending on national legislation.

Frequently asked questions (FAQ)

How can I receive more information on host differential sets?

If you would like to receive more information, please send us an e-mail.