Question

Match List I with List II
List I:
A. Zebra chip disease of potato
B. Fire blight of orchard tree
C. Carrot stolbur
D. Potato Rugose stunting virus
List II:
I. Cacopsylla pyricola
II. Bactericera trigonica
III. Russelliana solanicola
IV. Bactericera cockerelli
Choose the correct answer from the options given below:

• A. A-I, B-II, C-III, D-IV
• B. A-IV, B-I, C-II, D-III
• C. A-II, B-I, C-III, D-IV
• D. A-I, B-II, C-IV, D-III

Hint:

To remember this match: Zebra chip is transmitted by Bactericera cockerelli, while pear-related orchard pathogens are spread by Cacopsylla pyricola.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Many insect-transmitted plant diseases are spread by psyllids (jumping plant lice, superfamily Psylloidea).
These pests transmit various bacterial and phytoplasma pathogens, causing distinct symptoms in host plants.

Step 2: Detailed Explanation:
Let us correlate each disease or pathogen with its specific psyllid vector:
1. Zebra chip disease of potato (A): This disease is caused by the bacterium Candidatus Liberibacter solanacearum.
It is transmitted by the potato psyllid, Bactericera cockerelli (IV).
The feeding activity of the psyllid introduces the bacterium into the phloem, leading to striped discoloration in fried potato chips.
Therefore, A matches with IV.
2. Fire blight of orchard tree (B): While fire blight is caused by Erwinia amylovora, its spread is facilitated by insect vectors like the pear psylla, Cacopsylla pyricola (I), which creates entry wounds and spreads the bacteria mechanically.
Therefore, B matches with I.
3. Carrot stolbur (C): Carrot stolbur symptoms or associated Candidatus Liberibacter infections in carrots are transmitted by the specialized psyllid Bactericera trigonica (II).
Therefore, C matches with II.
4. Potato Rugose stunting virus (D): This viral or phytoplasma-like stunting condition is transmitted by the South American potato psyllid, Russelliana solanicola (III).
Therefore, D matches with III.

Step 3: Final Answer:
Combining these individual matches yields the sequence: A-IV, B-I, C-II, D-III.