During war, factories often retool to support the needs of the combatants. For instance, assembly lines change course from producing car parts to machine guns, or from building washing machines to aircraft engines. According to a new study led by Duke University, plants are capable of shifting from peacetime to wartime production too. Plants are frequently under attack from viruses, bacteria, and other pathogens. Each year, over 15 percent of crop yields are lost to bacterial and fungal diseases, costing the global economy about $220 billion. However,...