Citrus canker (a plant disease in lemons/oranges) and yellow vein mosaic of bhindi (okra) differ in their CAUSATIVE microorganism and mode of transmission. Which pairing is correct?
ABoth are caused by bacteria and spread by air
BCitrus canker — bacteria, air; Yellow vein mosaic — virus, insect
CCitrus canker — fungus, seeds; Yellow vein mosaic — protozoa, water
DCitrus canker — virus, insect; Yellow vein mosaic — bacteria, air
Answer & Solution
Correct answer: B. Citrus canker — bacteria, air; Yellow vein mosaic — virus, insect
From Table 2.2: citrus canker is a bacterial disease spread by air; yellow vein mosaic of bhindi is a viral disease spread by insects (whiteflies). Knowing both the agent AND the carrier tells you how to prevent the disease — e.g. using insecticides for vector-borne viruses but spraying antibacterials/copper sprays for bacterial cankers.
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