Rust

Rust
    Causal organism: Puccinia menthae
    Symptom
    • Brown rusty pustules on the lower surface of leave.
    • The spots initially circular ,slightly elevated and later Coalesce to form irregular spots.
    • Chloratic streaks on the upper surface, telial stage is characterized by swelling on the upper portion of the stem.
    • Defoliation and death of the leaves can be seen in severely affected plants (Leaf blighting)
    Taxonomy
    Kingdom: Fungi
    Division: Basidiomycota
    Class: Basidiomycetes
    Order: Uredinales
    Family: Pucciniaceae
    Genus:Puccinia
    Species:menthae
    Epidemiology
    • Temperature 17-27oC
    • RH:90-92 %
    • Long day hours 1-2 hours dew period in morning
    Etiology
    • Septate mycelia, Intercellular mycelia Intracellular haustoria
    • Asexual Spores: Uredospores in Uredium
    • Sexual spores: Teliospores in Telium
    • Life cycle of Puccinia menthae
    Management
    • Crop rotation with non host crop.
    • Spray mancozeb 0.25 %.
    • Hexaconazol 0.1 %

Last modified: Thursday, 1 March 2012, 12:32 PM