Paddy Diseases
False Smut
Symptoms
- The fungus transforms individual ovaries/grains into greenish spore balls of velvety appearance.
- Few to several spikelets in a panicle are affected.
- Favourable Conditions:
- Rainfall and cloudy weather during flowering and maturity, high soil nitrogen.
- Some of the green spore balls develop one to four sclerotia in the center.
- These sclerotia overwinter in the field and produce stalked stromata the following summer or autumn.
- In temperate regions, the fungus survives the winter by means of sclerotia as well as chlamydospores.
- The primary infections are initiated mainly by the ascospores produced from the sclerotia.
- Chlamydospores play an important role in secondary infection, which is a major part of the disease cycle.
Management
- Destruction of straw and stubble from infected plants.
- Avoid field activities when the plants are wet.
- At the time of harvesting, diseased plants should be removed and destroyed so that sclerotia do not fall in the field.
- This will reduce primary inoculum for the next crop.
- Field bunds and irrigation channels should be kept clean to eliminate alternate hosts.
- Excess application of nitrogenous fertilizer should be avoided.
- Regular monitoring of disease incidence during rabi season is very essential.
|
Fungicide |
Dosage |
|---|---|
|
250ml/acre |
|
|
250ml/acre |
|
|
250g/acre |
|
|
250g/acre |
