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02
Aug

Sheath blight (Corticium sasakii)

 

1. Greyish green lesions with purple margin develop on the leaf-sheath above the water level. Later, the lesions enlarge and coalesce with other lesions.

2. The symptoms are usually not distinct till flowering. Its severe attack results in the poor filling of the grains.

3. Burn the rice straw and stubbles after harvesting the affected crop. Avoid the exces

02
Aug

Brown leaf spot (Drechslera oryzae)

 

1. It produces oval, eye-shaped spots with a conspicuous dark-brown spot in the centre and light brown margin.

2. The support is surrounded by yellow halo. Spots are also produced in the grains. This disease occurs in poor soils, therefore, give adequate and nutrition to the crop.

3. To control the disease, give two sprays of Tilt 25 EC (propiconazole) @ 200ml or

02
Aug

Blast (Pyricularia grisea)

 

1. The fungus causes spindle shaped spots with grayish centre and brown margin on the leaves at maximum tillering.

2. It also causes brown lesions on the neck of the panicle showing neck rot symptoms and the panicles fall over.

3. The disease is more severe on Basmati particularly in the submontaneous areas and under application of heavy nitrogenous fertilizers.

31
Jul

Bacterial leaf streak (Xanthomonas oryzae pv. oryzicola)

1. Small translucent streaks appear in the interveinal areas of the leaf. 2. The streaks gradually enlarge and turn reddish, when the plants near maturity.
31
Jul

Bacterial leaf blight (Xanthomonas oryzae pv. oryzae)

Greenish-yellow strips appear along the leaf margins and extend both lengthwise and breadthwise. The leaf starts drying from the tip, becomes white in severe cases and dries up completely. The disease sometimes attacks the freshly transplanted seedlings which start wilting and in a few days the whole clump dries up. The bacterium perpetuates through seed, rice straw, and roots of non-host plants during the off-season. In order to mitigate the losses, adopt the following measures : (i) For the m
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