Rust
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Rust is a plant disease caused by obligate parasitic fungi belonging to the class basidiomycetes. The disease causes severe damage to wheat, oats, barley, and vegetable crops. Symptoms include rust-colored spots on leaves and stems that rupture the epidermis. Rust fungi like Puccinia infect hosts like wheat, barley, oats, and beans. They have complex life cycles producing spores that allow the disease to spread. Control methods include removing alternate hosts, growing resistant varieties, spraying fungicides, crop rotation, and field sanitation.
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Rust
- 2. Introduction • Rust disease caused by obligate parasites, which belongs to the class basidiomycetes. • They constitute most destructive plant disease. • They are responsible for severe damage of wheat , oat, barley , vegetables crops.
- 3. Symptoms • Disease symptom appears mostly on the leaves and stem. • The infected region appear dry, rusty orange or yellow or white color spots that rupture the epidermis. • Some form of swelling and even galls also appear.
- 4. Causal organism • Species of 1. Puccinia :- black rust of wheat mainly 2. Hemilia 3. Uromyces 4. Melenospora 5. Phakopora 6. Phlagmedium
- 5. Host • Wheat • Barley • Oat • Coffee • Rye • Bean • Sweet pea • Soyabean and so on……..
- 6. Disease cycle • Rust disease show host specificity at the sub species level. • Most of the rust fungi produce five fruiting bodies 1. Basidiospores 2. Teliospore 3. Teleutoapore 4. Pycnispore 5. aceiospore
- 7. Continued…….. • Some rust fungi produce only teleutospore and basidiospore, this fungi are called microcyclic or shot cycle. • Some fungi produces pycnispore , aeciospore , teleutospore with basidiospore and teliospore, hence it is called macrocyclic or long cycle rust.
- 8. Control measure • Removing or destroying alternate host. • Using disease resistance variety of crop plants. • Spraying with systemic fungicide such as triadrimol and fenopil. • Crop rotation. • Field sanitation