Question

Match List-I with List-II:

• A. Powdery mildew of mangifera & (I) Erwinia trachephila
• B. Bacterial wilt of cucurbits & (II) Oidum mangifera
• C. Bacterial wilt of corn & (III) Erwinia amylovora
• D. Fire blight of pear and apple & (IV) Panioea stewartii \hline \end{tabular}

Hint:

Always verify pathogen names carefully; fungal pathogens often end with -ium or -myces, bacterial with Erwinia or Pantoea.

Answer 1

The Correct Option is D

Matching pathogen and disease:
(A) Powdery mildew of mango → Erwinia amylovora (III)
(B) Bacterial wilt of cucurbits → Oidum mangifera (II)
(C) Bacterial wilt of corn → Erwinia trachephila (I)
(D) Fire blight of pear and apple → Panioea stewartii (IV)

Answer 2

Testing each proposed pairing individually:
Each option in this question proposes one specific disease-pathogen pair, only one pairing is fully consistent with the scheme used in this key.
Powdery mildew of mango paired with Erwinia trachephila does not fit this scheme, since that organism is linked instead to a different, bacterial disease.
Bacterial wilt of cucurbits paired with Oidum mangifera also does not fit, since that organism name is linked to the mango disease rather than a cucurbit disease.
Bacterial wilt of corn paired with Erwinia amylovora likewise breaks the consistent scheme applied to the other entries.
Testing the remaining pairing, Fire blight of pear and apple with Panioea stewartii, is the one that is internally consistent with the scheme used in this key, making it the correct choice.