Discussion
Correctly match the following plant diseases in Group-I with their causal organisms in Group-II.
| Group-I | Group-II |
|---|---|
| (P) Red rot of sugarcane | (1) Albugo candida |
| (Q) Tikka disease of groundnut | (2) Cercospora personata |
| (R) Late blight of potato | (3) Plasmodiophora brassicae |
| (S) White rust of mustard | (4) Phytophthora infestans |
| (5) Colletotrichum falcatum |
Answer: C
The correct matching is P-5; Q-2; R-4; S-1.
- Red rot of sugarcane is caused by Colletotrichum falcatum (5).
- Tikka (leaf spot) disease of groundnut is caused by Cercospora personata (2), with C. arachidicola causing the early leaf spot.
- Late blight of potato, behind the Irish famine, is caused by Phytophthora infestans (4).
- White rust of mustard and other crucifers is caused by Albugo candida (1).
Plasmodiophora brassicae (3) is the distractor: it causes club root of crucifers, not any disease in the list. The first option gives red rot to Albugo and white rust to Plasmodiophora, the second swaps the tikka and white rust pathogens, and the last gives tikka to Plasmodiophora and late blight to Albugo.
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