 Garlic plants are said to repel rabbits and moles.The California Department of Food and Agriculture (CDFA) conducts a certification program to assure freedom from nematode and white rot disease caused by "Stromatinia cepivora", two pathogens that can both destroy a crop as well as remain in the soil indefinitely, once introduced.Garlic may also suffer from pink root, a typically non-fatal disease that stunts the roots and turns them pink or red; or leek rust.