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30
Jul

Management of Bacterial Leaf Blight of Rice

No single effective control measure is available. Therefore, integrated measures are suggested. Use of resistant cultivars Use of resistant cultivars is the most economic and environment safe strategy for the management of bacterial blight disease. Although several BB R genes have been identified and characterized, the effectiveness of these genes varies due to difference in virulence profile of the pathogen in different geographical regions. In India, a large no. of rice varieties has
30
Jul

Predisposing factors for Bacterial Leaf Blight of Rice

  • Lateritic and alluvial soil favour more bacterial blight diseases. 
  • Water logging condition encourages disease development. 
  • Excessive use of N fertilizers from tillering stage to maximum tillering stage encourages disease development. 
  • Growing of the crop under shade favours disease development.
  • Pruning of leaves at the time of transplanting favours disease development.

 

30
Jul

Causal organism of Bacterial Leaf Blight of Rice

The causal organism is the bacterium Xanthomonas oryzae pv. oryzae (Ishiyama) Swings et al. According to the new classification system, it has been placed in: Phylum : Proteobacteria Class : Gyammaproteobacteria Order : Xanthomonadales Family : Xanthomonadaceae
30
Jul

Symptoms of Bacterial Leaf Blight of Rice

• Water soaked lesions move from tip downwards on the edges of leaves.

• Gradually symptoms turn into yellow and straw coloured stripes with wavy margins.

• In early morning in humid areas yellowish, opaque, turbid drops of bacterial ooze may be seen.

• In Kresek (wilt) phase, leaves roll completely, droop and plants die completely.

30
Jul

Economic Importance of Bacterial Leaf Blight of Rice

1. The extent of yield loss depends on the growth stages of the crop at which it is infected, the level of susceptiblility of the cultivar, season, climatic condition and level of nitrogen fretilizer applied. 2. The damage may be due to partial or total blighting of the leaves or complete wilting of the affected tillers leading to unfilled grains. 3. When the disease occurs at the maximum tillering stage the yield reduction may be 70% in susceptible cultivars like TN 1 and up to 20% i
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