Match List – I with List – II and select the correct answer from the code given below the lists.
List – I (Plant disease)
A. Citrus Canker
B. Red rot disease of sugar cane
C. Krishnakant disease of potato
D. Sahu disease of wheat
List – II (Factor)
1. Insect
2. Deficiency of oxygen
3. Bacteria
4. Fungus
Code :
   A B C D

The correct matching of plant diseases with their causal factors is as follows:

• Citrus Canker: It is a bacterial disease caused by Xanthomonas axonopodis pv. citri, which affects the leaves, stems, and fruit of citrus trees.
• Red rot of sugar cane: This is a major fungal disease caused by Colletotrichum falcatum, leading to significant yield loss.
• Krishnakant (Black Heart) of potato: This is a physiological disorder caused by a deficiency of oxygen in the internal tissues of the potato, usually due to poor ventilation during storage or transport.
• Sahu (Sehu) disease of wheat: Also known as Ear Cockle, it is caused by the nematode Anguina tritici. In general science classifications, it is often grouped under pests or insects.

Matching these gives the sequence: A-3, B-4, C-2, D-1.