Damping off of Belladona

Damping-off of Belladona
    Causal organism:Pythium ultimum, Pythium debaryanum, Rhizoctinia solani and Phytophthora parasitica.
    SYMPTOMS
    Roots of affected seedlings or sprouts show water soaked lesions at the base below soil level and exhibit rottening, reddening, drooping down and falling of leaves.
    Causal organism
         		: Rhizoctonia solani
    Etiology
    		 :
    Septate mycelia, subepidermal haustoria
    Vegetative structure
    		 :
    Sclerotial bodies
    Sexual spores
    		 :
    Absent
    Asexual spore
    		 :
    Mycelial strands (Sterile fungi)
    Primary source of inoculum
    		 :
    Sclerotial bodies
    Secondary source of inoculum
    		 :
    Soil borne mycelial strands and sclerotial bodies
    Epidemiology
    		 :
    Warm weather, Temperature range 28-320C, Optimum moisture, susceptible host and Neutral pH

    Causal organism
         		: Pythium ultimum
    Etiology
    		 :
    Aseptate, intercellular mycelia and intracellular haustoria
    Vegetative structure
    		 :
    Dormant mycelia
    Sexual spores
    		 :
    Oospore
    Asexual spore
    		 :
    Zoospore and sporangia
    Primary source of inoculum
    		 :
    Oospore
    Secondary source of inoculum
    		 :
    Air borne zoospore
    Epidemiology
    		 :
    Cool climate, Optimum temperature 18-220C, RH-90 to 95 % and Susceptible host

    Management
    • Use healthy seeds.
    • Follow raised bed method of cultivation.
    • Reduce seedling density.
    • Soil application of biological agents (Trichoderma spp.).
    • Soil Drenching with mancozeb (0.25%) .

Last modified: Friday, 22 June 2012, 1:02 PM