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11
Jul

Mode of Spread and Survival for Bacterial Leaf Blight (BLB) of Rice

The infected seeds as a source of inoculum may not be important since the bacteria decrease rapidly and die in the course of seed soaking. The pathogen survives in soil and in the infected stubbles and on collateral hosts like Leersia spp. Plantago najor, Paspalum dictum, and Cyanodon dactylon. The pathogen spreads through irrigation water in dry season and also through typhoons and rain storms.
11
Jul

Favourable conditions for Bacterial Leaf Blight (BLB) of Rice

Clipping of tip of the seedling at the time of transplanting, heavy rain, heavy dew, flooding, deep irrigation water, severe wind, temperature of 25-30OC and application of excessive nitrogen, especially late top dressing.
11
Jul

Pathogen for Bacterial Leaf Blight (BLB) of Rice

Xanthomonas oryzae pv. oryzae The bacterium is strict aerobe, gram negative, non spore forming, rod shaped with size ranging from 1-2 x 0.8-1.0um with monotrichous polar flagellum of 6-8 um. The bacterial cells are capsulated and are joined to form an aggregate mass. Colonies are circular, convex with entire margins, whitish yellow to straw yellow later and opaque.
11
Jul

Bacterial Leaf Blight (BLB) of Rice

Symptoms: The disease is usually noticed at the time of heading but in severe cases occur earlier also. Seedlings in the nursery show circular, yellow spots in the margin, later enlarge, coalesce and cause drying of foliage (Fig. 19). “Kresek” symptom is seen in seedlings, 1-2 weeks after transplanting. The bacterium enters through the cut wounds in the leaf tips, becomes systemic and cause death
11
Jul

Management for Sheath Blight of Rice disease

- Avoid excess doses of fertilizers. - Adopt optimum spacing. - Eliminate weed hosts. - Apply organic amendments. - Avoid flow of irrigation water from infected fields to healthy fields. - Deep ploughing in summer and burning of stubbles. - Seed Treatment: with Carbendazim 50 WP or Beam (Tricyclazole) @ 2 gm/kg seed. - Seed treatment with biocontrol agent: Pseudomonas fluorescens @ of 10g/kg of seed followed by seedling dip @ of 2.5 kg or products/ha dissolved in 100 litres and dipp
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