Agri Diseases

DISEASES OF MUSTARD / RAPE SEED – Agricultural study material

White rustAlbugo cruciferarum
Leaf blightAlternaria brassicae

1. WHITE RUST / BLISTER- Albugo cruciferarum

Symptoms

Isolated, raised and shiny white pustules develop on leaves and stem. In severe cases, the entire plant may remain dwarf and only small leaves are formed. The pathogen is an obligate parasite.

Mode of spread and survival

The infection takes place through seed borne inoculum and the pathogen survives as oospores in soil

Epidemiology

Rain with low temperature at flowering stage encourage the disease development

Management

  • Seed treatment with metalaxyl @ 2 g/kg of seed
  • Spray mancozeb or captafol @ 1 kg/ha
  • Grow disease resistant varieties like T 4 and YRT 3



 2. LEAF BLIGHT- Alternaria brassicae


Symptoms

Small black coloured areas of circular lesions with concentric rings are formed. The disease reduces the size of fruits and number of seeds.

Mode of spread

The pathogen spreads through wind borne conidia

Survival

The pathogen is externally and internally seed borne

Epidemiology

Rainy weather encourage the disease development

Management

  • Spray mancozeb or zineb or captafol @ 1 kg/ha
  • Remove and destroy the infected plant debris

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