Question

Which of the following combinations of plant diseases and the types of their causal organisms is/are {CORRECT?}

• A. ( Late blight of potato - Bacteria )
• B. ( Black rot of crucifer - Bacteria )
• C. ( Tungro disease of rice - Mycoplasma )
• D. ( Root knot of tomato - Nematode )

Hint:

Always refer to the latest plant pathology guides or databases to confirm the causative agents of plant diseases, as this information is critical for effective disease management and can sometimes be updated with new scientific insights.

Answer 1

The Correct Option is B

Plant diseases can be caused by a variety of pathogens including bacteria, viruses, fungi, nematodes, and other organisms. Identifying the correct pathogen is crucial for effective management and treatment. Analysis of Each Option: 
(A) Late blight of potato: Incorrect. Late blight of potato is caused by the oomycete {Phytophthora infestans}, not bacteria. 
(B) Black rot of crucifer: Correct. Black rot of crucifers, including vegetables like cabbage and cauliflower, is caused by the bacterium {Xanthomonas campestris pv. campestris}. 
(C) Tungro disease of rice: Incorrect. Tungro disease of rice is caused by a combination of a DNA and an RNA virus, not by mycoplasma. 
(D) Root knot of tomato: Correct. Root knot of tomato and other plants is caused by nematodes, specifically from the genus {Meloidogyne}. Conclusion:
Explanation: Correctly identifying the pathogen behind specific plant diseases aids in applying appropriate agricultural practices and phytosanitary measures to control or eradicate the disease.