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Which one of the following is a plant disease caused by bacteria?
1. Yellow vein mosaic of Bhendi
2. Rust of wheat
3. Citrus canker
4. Blight of potato

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Correct Answer - Option 3 : Citrus canker

The correct answer is Citrus canker.

  • Citrus canker is a disease affecting citrus species caused by the bacteria Xanthomonas axonopodis.
  • Xanthomonas is a gram-negative bacteria.
  • Most of the pathogenic bacteria are from the gram-negative group.
  • Xanthomonas causes damage to the plant leaves, stems, and fruit.
  • The infection causes by citrus trees, including lime, oranges, and grapefruit.

  • The Yellow vein mosaic disease of Bhendi is a viral disease that causes heavy crop loss, especially if the disease occurs in the early stages of crop growth. 
  • The rust of wheat is caused by the fungi - Puccinia.
  • A blight of potato is caused by the fungi - Alternaria solani.

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