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Which one is the wrong pairing for the disease and its causal organism?

1. (a) Black rust of wheat - Puccinia graminis
2. (b) Loose smut of wheat - Ustilago nuda
3. (c) Root-knot of vegetables - Meloidogyne sp
4. (d) Late blight of potato - Alternaria solani

Correct answer: (d) Late blight of potato - Alternaria solani

Solution

Late blight of potato is caused by Phytophthora infestans, not Alternaria solani. Alternaria solani causes early blight of potato, so this pairing is incorrect.

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