"Three new leaf lettuce breeding lines with resistance to corky root, a serious disease of lettuce, have been released by the Agricultural Research Service (ARS).
Corky root is caused by a bacterium called Sphingomonas suberifaciens. It lives in the soil and attacks the plant's roots, causing them to enlarge and develop yellow to brown lesions and longitudinal cracks, taking on a cork-like appearance.
Once infected, the roots are unable to effectively absorb water and nutrients, resulting in smaller lettuce heads and yield loss. Cultural practices and fumigation techniques used to treat the disease are costly and labor-intensive. Therefore, developing lines with genetic resistance is still the most common and preferred method to combat the disease."Stephanie Yao, Agricultural Research Service (ARS)
Source: USDA (ARS) http://www.ars.usda.gov
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