Sugarcane Common Rust

  • Symptoms

  • Trigger

  • Biological Control

  • Chemical Control

  • Preventive Measures

Sugarcane Common Rust

Puccinia melanocephala

Fungus


In a Nutshell

  • Initial symptoms are elongated yellowish leaf spots.
  • Spots change colour to reddish-brown gradually.
  • Heavily affected leaves could get necrotic.

Hosts

Sugarcane

Symptoms

The initial symptoms of sugarcane common rust are elongated yellowish leaf spots, of about 1-4 mm length. With the development of the disease (primarily on the lower leaf surface) the spots elongate parallel to the leaf venation. They enlarge up to 20 mm in length and one to three mm in width. They also turn into orange-brown or red-brown flecks with a slight but definite chlorotic halo. Later, the rust pustules fuse. This leads to rupture of the leaf epidermis and the development of necrotic areas. Lesions are usually more abundant closer to the leaf tip and decrease in number toward the base.

Trigger

98 % relative humidity and cool nights followed by warm days with temperatures between 20°C and 25°C favour Common Rust. Continuous leaf wetness (nine hours or more) also supports the spread of the disease. Under favorable conditions the infection cycle of Common Rust (Puccinia melanocephala) is less than 14 days long. Plants aged two and six month are most susceptible to Common Rust.

Biological Control

Sorry, we don't know of any alternative treatment against Puccinia melanocephala . Please get in touch with us in case you know of something that might help to fight this disease. Looking forward hearing from you.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatments if available. A treatment with fungicides can be economically unfavorable and not practical.

Preventive Measures

Grow resistant cultivars. Ensure balanced nutrient status of the soil. Ensure adequate water supply of the soil during growth period. Apply long furrow or paired row planting methods. Remove and burn leftovers and harvest trash of affected crops.