After years of intensive research and breeding, the Dutch vegetable seed company Rijk Zwaan is launching two Romaine lettuce varieties for the US market with a resistance against the Impatiens necrotic spot virus (INSV). These varieties are the first in the company’s INSV Defense line. “We are really excited that we can support lettuce growers and processing companies with this breakthrough. For them, this can make the difference between profit and loss,” state Johan Schut and Christophe Thomas from the Rijk Zwaan breeding team.