Prereq.:BIOL 1201 and BIOL 1208 or equivalent.3 hrs. lecture; 3 hrs. lab. Nature and cause of disease in plants; relation of environment and host-parasite interactions to development of disease symptoms caused by plant pathogenic fungi, bacteria, viruses, mycoplasms and nematodes; abiotic causes of disease; methods of disease control; diseases affecting Louisiana crops and ornamentals.