racine (1) microscopie (1) feuille (1) maladie (1) culture (1) Colonies (1) Witches (1) Microscopy (1) Tissues (1) Pigeon pea (1) Petioles (1) Phytoplasmas (1) Pathogenic microorganisms (1) Materials (1) Catharanthus roseus (1) Growth (1) Flowers (1) Field crops (1) Examinations (1) Diseases--Causes and theories of causation (1) Cutting (1) Culture (1) Crops (1) Colonies (1) Cassava (1) America (1) Materials (1) Pathogens (1) Losses (1) Growth (1)