Plantlet The Blogging Platform of Department of Botany, University of Dhaka
Black rust of wheat
Host
- Triticum aestivum
Pathogen
- Puccinia graminis-tritici
Symptoms
- Rust infection is observed in leaves, leaf sheaths, stems, floral structures in the form of rust pustules.
- Reddish brown pustules appear during the formation of urediniospore.
- Black pustules appear during the formation of teliospore.
- On maturity, the teliospore bursts out and then masses of dark brown teliospores are seen on the stem, so called black rust.
- In case of severe infection, the diseased plant is stunted.
- Small spikes and shrivelled grains can be produced or no grains at all.
Control measures
- Resistant variety should be used.
- Burning of infected crop varieties.
- Proper sanitation.
- Spraying fungicide.
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Loose smut of wheat
Host
- Triticum aestivum
Pathogen
- Ustilago hordei
Symptoms
- Loose smut manifests itself only when the ears emerge from the leaf.
- All spikelets are affected and transformed into a mass of black powder spores.
- Each smutted spikelet is covered by a thin silvery membrane.
- The powdery mass of spores is blown off by wind, leaving behind only the central rachis.
