seedling blight of rice

What is rice seedling blight?

Seedling blight, or damping off, is a disease complex caused by several seed-borne and soil-borne fungi, including species of Cochiobolus, Curvularia, Fusarium, Rhizoctonia and Sclerotium. ... Cold, wet weather is most favorable to disease development. Seedling blight causes stands of rice to be spotty, irregular and thin.

What is seedling blight?

Seedling blight is a fungal infection that causes the seed or seedling to rot and die. It can be characterized by patches in the field that fail to germinate. If the seedlings do manage to germinate, they may not emerge, or they may emerge and then become brown, pinched, and die.

What is the age of seedling in rice for transplanting?

Based on previous research and local rice production, the suitable seedling age for mechanically transplanted rice is commonly considered to be less than 25 days³.

Can seedlings recover from damping off?

There is no cure for plants that already have damping off. However, you can easily prevent the problem by providing good air circulation. A small fan or simply cracking the lid of the germination tray will suffice.

Can a plant survive root rot?

Prolonged root rot may lead to death of the plant. In extreme cases, plants affected by root rot may die within 10 days. Root rot is usually lethal although it is treatable. An affected plant will not normally survive, but may potentially be propagated.

What is sheath blight disease?

Sheath blight is a fungal disease caused by Rhizoctonia solani. Infected leaves senesce or dry out and die more rapidly, young tillers can also be destroyed. As a result, the leaf area of the canopy can significantly be reduced by the disease.

How will you manage aged seedlings?

Management of Aged seedlings

Follow the spacing recommended to medium and low fertility soil.
Avoid cluster planting of aged seedlings, which are hindering the formation of new tillers.
To encourage the tiller production, enhance the basal N application by 50% from the recommended dose.

How do you transplant rice seedlings?

How to transplant rice manually?

Pull out the seedlings at an average of 15 to 30 days after seeding (DAS) from nurseries and transport them to the main field. ...
In a modified mat nursery, seedlings are ready for transplanting at 15–20 DAS and seedling mats are transported into the main field.

What is the average number of transplanted seedlings per hill?

Hybrid seed, which is more costly, is often transplanted as one seedling per hill while traditional varieties are sometimes planted with up to 6 seedlings per hill. In most countries, the farmers plant 2 to 3 seedlings per hill.

Can I spray fungicide on seedlings?

All of these fungicides can cause some stunting and yellowing of young seedlings. Do not use fungicides unless damping-off becomes or has been a problem.

How do you keep seedlings from damping off?

It is most common in young seedlings. Often large sections or whole trays of seedlings are killed. It can cause root rot or crown rot in more mature plants. Use sterilized pots or trays with good drainage and use clean, new potting soil to prevent damping off.

How do you protect seedlings?

An easy and inexpensive way to protect your wee plantlings is with a plastic pop-bottle cloche! Any plastic bottle will do. Small ones are good for individual plants that grow straight up, and larger ones will cover multiple seedlings or ones that become bushy. Unscrew and discard the cap.

Can I reuse soil after root rot?

Although you can reuse the potting soil alone after salvaging it, mixing it with new potting soil or compost replenishes its organic matter, creating a better growing medium.

Does root rot disappear?

The rot can then spread to healthier roots and kill them as well, even if the soil conditions are corrected. ... The fungus may lie dormant in soil indefinitely and then suddenly flourish when the plant is overwatered once or twice. The root rot fungus attacks the roots and causes them to die and rot away.

Can you reuse soil with root rot?

Garden soils often contain root rot fungi. ... Third, minimize potential contamination of your plants with root rot fungi. DO NOT reuse potting mix from your houseplants, or water that has drained from your plants, as both potentially can contain root rot fungi.

How do you control blight sheath?

Chemical methods

Control of sheath blight has been mainly through the use of foliar fungicides.
Carbendazim (1 g/lit), Propiconazole (1ml/lit) may be applied.
Spraying of infected plants with fungicides, such as Benomyl and Iprodione, and antibiotics, such as Validamycin and Polyoxin, is effective against the disease.

How do you control bacterial leaf blight?

Preventive method

Seed treatment with bleaching powder (100g/l) and zinc sulfate (2%) reduce bacterial blight.
Seed treatment - seed soaking for 8 hours in Agrimycin (0.025%) and wettable ceresan (0.05%) followed by hot water treatment for 30 min at 52-54oC;

What is the causal organism of rice bacterial blight or sheath blight disease?

Sheath blight is a soilborne disease caused by the fungus Rhizoctonia solani AG1-IA. The fungus belongs to the phylum Basidiomycota, family Ceratobasidiaceae.

What are the advantages and disadvantages of direct seeding?

Some advantages for direct seeding is that they mature faster than direct seeding. Some disadvantages are that direct seeding leaves the plants open to pests like birds and rats. Some advantages to indirect seeding is that you can control how the plant grows and shapes by potting it.

What is the spacing of rice?

On the basis of these results it is concluded that the spacing of 22.5 x 22.5 cm² between hills and rows is most suitable for obtaining optimum grain yields in the rice crop.

What is crop spacing?

Crop spacing refers to the number of crops planted in a unit area especially the distance between one plants. ... Overcrowding of crops may reduce yields and may also lower the quality of the produced due to competition for light and soil nutrients.