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Agricultural crops :: Cash crops :: Sugarcane

Rust: Puccinia erianthi

Symptoms:            
  • The earliest symptoms are small, elongated yellowish spots that are visible on both leaf surfaces.
  • The spots increase in length, turn brown to orange-brown or red-brown in color, which coalesced and formed large, irregular necrotic areas, thus it shows rusty appearance of leaf.
  • This eventually resulted in premature death of the leaves.
   

Yellow spots on leaf

  Red-brown spots   Rusty apperance
Pathogen:
  • Uredinia are elongate, reddish-brown, with capitate, hyaline to light brown paraphyses.
  • Urediniospores are thick-walled, orange-brown, obovoid, measuring 26-34 x 16-20 µm. The urediniospore surface is  echinulate with 4-5 equatorial pores.
  • Teliospores are dark brown and measure 30-43 x 17-23 µm, clavate, two-celled and slightly constricted at the septum.

Management strategies                                               

Cultural method

  • The best means of control for sugarcane rust is to grow resistant varieties Use resistant varieties like Co 91010 (Dhanush), Co 87025 (Kalyani)
  • Affected leaves should be remove and burn immediately
  • Sugarcane grown in fields receiving recent applications of mill mud is typically very prone to rust
     
  Puccinia erianthi   Teliospores  
Chemical method
  • Spray Tridemorph 1.0 litres or Mancozeb 2.0 kg/ha.
  • Use dithane M 45 @ 2 g/lit for one spraying.
  • Application of triazole or strobilurin or pyraclostrobin fungicide @ 3 g/ lit of water.

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