Anbu's Learn Microbiology

  TIKKA LEAF SPOT ON GROUNDNUT LEAF  [FUNGAL DISEASE] (Source: https://www.plantsdiseases.com/p/diseases-of-groundnut.html ) CAUSING ORGANISM: 1.       Cercospora arachidicola 2.       Cercospora personata GENERAL CHARACTERS: ü   Shape : Cylindrical or elliptical. ü   Size : Small (20-60 µm long). ü   Color : Hyaline (transparent) to grayish. ü   Septation : Typically multi-septate. BIOCHEMICAL TEST: Both species have same biochemical characters. ü   Catalase Test : Positive ü   Oxidase Test : Negative ü   Protease Production : Positive ü   Cellulase Production : Positive ü   Amylase Production : Positive ü   Lipase Production : Positive ü   Pectinase Production : Positive ü   Melanin Production : Positive (dark pigment production on culture media) ü   Enzyme Activity for Lignin Degradation : Positive SYMPTOMES: 1 . ...

  RED ROT IN SUGARCANE (Source:https://agritech.tnau.ac.in/crop_protection/sugarcane_diseases/sugarcane_d4.html) INTRODUCTION TO RED ROT IN SUGARCANE: Red rot is a devastating fungal disease affecting sugarcane, caused by Colletotrichum falcatum . It poses a significant threat to sugarcane production worldwide, leading to substantial reductions in crop yield and sugar recovery. The disease was first identified in India in the late 19th century and has since spread to several other sugarcane-growing regions globally. Red rot can cause large-scale destruction in sugarcane fields if not properly managed, making it one of the most serious diseases in the sugar industry. CAUSING ORGANISM:      Colletotrichum falcatum . GENERAL CHARACTERS: ·          Conidia: Cylindrical to curved, 10-20 µm long, 3-5 µm wide, colorless to light brown. ·          Appressoria: Flattened, circul...