Question

Tikka disease occurs in
A) Rice
B) Groundnut
C) Wheat
D) Sugarcane

Answer 1

Hint: The pathogen perennialism on infected plant debris residing in the soil by conidia. Conidia can also stay attached to the shell as well. It has also been observed that they remain linked to the seeds and are due to primary infection.

Complete Answer:
- Many areas of the host plant above soil level are invaded by the disease.
- On the leaflets of the lower leaves, the first apparent signs occur as dark spots, surrounded by yellow circles at a later stage. The spots will be oval.
- They occur on the leaves in huge numbers. Mature spots, especially on the top surface of the leaflets, are dark-brown to nearly black.

Now, let us find the solution from the options-
- Cercospora personata is the causative agent of Tikka disease.
-By forming haustoria in the palisade and spongy mesophyll host cell, Cercospora personata has mycelium that is fully internal and ramifies intracellularly.
-The mycelium develops dense stroma which ultimately makes septate to non- septate geniculate hypophyllous conidia.

Thus, the correct answer is option (B) Groundnut.

Note: The conidiophores are typically amphigynous, however on the younger patches they are produced on the upper surface. They are non- septate to separate and develop, geniculate, hyaline to partially olive, 4- to 13-septate obclavate, sometimes curved, conidia ranging 38-108 μ in length and 2-5 μ in width.