Cabbage is prone to infection by several parasites. Cabbages are often infected with fungi, bacteria, parasites, etc. To prevent the spread of infection, cabbages are sown with sufficient distance between them. Cabbages are also prone to pest infections like nematodes, maggots, and caterpillars. Cabbages show distinct phenotypic changes like necrotic and chlorotic leaves, club roots, and other disease symptoms because of infection due to these parasites.