wilt

Wilt
    Causal organism: Verticillium albo-atrum. (Reinke & Berth)

    SYMPTOMS
    • The infected limbs get defoliated in early summer.
    • The declining symptoms are first seen on the lower branches.
    • Roots of infected plants turn brown and die.
    • No partial wilt but lower leaves show yellowing symptoms that occurs at flowering and fruiting stage.
    • Complete loss depending upon seveitrty of infection.
    • V – Shaped yellowing of leaf margin.

    ETIOLOGY

    • Septate mycelia, V – shaped conidiophore on which single celled conidia is formed.
    • PSI: Dormant mycelia
    • SSI: Conidia (unicellular)

    EPIDEMIOLOGY
    • Warm weather, prefers alkaline PH and more severe in black clay soil; temperature-28°- 290 C and RH-80-85%.
    • Low soil moisture, fungal and nematode infested soil favours occurrence of the disease.
    Management
    • Cut and burn the infected plant parts.
    • Treat seeds with Carbendizine @
    • Apply carbendizine @ 1.5 gm/liter as soil drenching.
    • Neutralize soil PH by gypsum application @
    • Uproot initially infected plants and burn.
    • High potassium and low Nitrogen application in the soil.
    • Application of Bavistin at the rate of 1.5 g / liter as soil drenching & Trichoderma viridae reduce the disease incidence.

Last modified: Wednesday, 1 February 2012, 10:54 AM