News & Events
New Race Bremia lactucae (BI: 10US) Nominated
Bremia lactucae is the casual agent of downy mildew in lettuce, and it is genetically variable. Even within a single lettuce field, several different races can be present. Monitoring the evolution of new strains of Bremia is important to breeders and growers to stay on top of disease resistance. As of July 1st, 2025 a new strain of Bremia has been nominated within the United States, BI: 10US.
As we strive to provide best-in-class solutions to our customers, we work hard to test our varieties against these new races. Together with our Breeding and R&D teams, we continuously monitor the development of Bremia lactucae. Disease resistance is a key component of our breeding program in order to provide a portfolio with robust and reliable resistance to our customers.
Along with genetic resistance, BASF | Nunhems emphasizes the importance of an integrated crop management program. Chemical control and hygiene measures give an additional protection to resistance lettuce crops, which will lower the chance of disease, and further limit the development of new Bremia races.
Current resistance information for the lettuce range including BI: 10US can be found on our website:
For more detailed information on BI: 10US, please view the International Seed Federation's website or download the official press release from IBEB-US (International Bremia Evaluation Board):
Information provided is based on experience with tests, trials, or practices as well as general observations over multiple years.
Individual results may vary. Nunhems USA, Inc. (“Nunhems”) strives to provide accurate and complete information, descriptions, content, illustrations, images, and data (“Information”) on its websites, social media sites/posts, and printed materials (“Publications”) as such Information is reasonably available to Nunhems at time of compilation. When the Information is based on experiences with tests, trials, or practices, such Information is provided by Nunhems as closely as commercially possible to such experiences. Information may also be based on general observations. However, Nunhems cannot guarantee the Information in any form whatsoever; therefore, the Information is provided on an ‘AS IS’ basis and without any guarantee, either express or implied, including, without limitation, that the Information is accurate or complete. Under no circumstances is the Information to be considered as advice or as a recommendation. Buyer is solely responsible for seed selection and purchasing decisions, including whether to rely upon the Information and for determining suitability of the seed for the intended growth and use under buyer’s local conditions.
The Publications are intended to help buyer identify plant diseases that may or could affect his/her crops. The images may give a distorted image of reality andmay otherwise not be an accurate portrayal of the disease