date:Aug 06, 2013
dew in lettuce, is genetically very variable. Even within one lettuce production field and within one isolate from a field, several races may be present. On November 30, 2012, the International Bremia Evaluation Board met in Paris to evaluate the Bremia lactucae races found in Europe in 2012. A total of 202 isolates were on the gross list of the companies and were discussed. About 42 isolates (21%) were lacking the ability to break important resistance genes used in common lettuce varieties. Abo