On both sides of the leaves, yellow to white spots appear. These spots can be raised. As the disease progresses, the spots merge and form reddish-orange and rusty pustules. The pustules may have yellow margins. Later the pustules can turn darker. The leaves may die because of the infection and in severe cases the plants collapse.
The pathogen has a wide range of alternative hosts like eggplant and many grass varieties. The fungus can be spread over large distances by wind. Further, the pathogen survives in the soil, on plant residues and on alternative hosts. Favorable conditions for the fungus are cool nights and warm days, such that dew can develop on the leaves. This leads to a higher risk of infection.
Sorry, we don't know of any alternative treatment against Puccinia substriata . Please get in touch with us in case you know of something that might help to fight this disease. Looking forward hearing from you.
Fungicides like copper compounds, Chlorothalonil, Sulphur or Mancozeb can be applied to control Rust on millet. For smallholders, fungicides are in most cases not economical.