Agricultural Pathology Essentials: Rahul’s Quick Guide for Master’s Prep

Indirect penetration

  1. Wounds: Rhizopus , Aspergillus, Penicilium, Colletotrichum, etc. @ Rahul PC
  2. Natural opening:

a) Stomata: Puccina graminis tritici

b) Lenticels: Sclerotinia fructicola (Brown rot of fruits) , Streptomyces scabies (Potato scab).

c) Hydathodes: Xanthomonas campestris pv. Campestris (Black rot of crucifers).

 

Cell wall of pathogen

a) Middle lamella (made of pectin) : Lignin is found.

b) Primary wall (Made of cellulose, pectic substances): Primary constituents is hemicellulose.

c) Secondary wall: Entirely cellulose.

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