Arrange the correct sequence of events in a disease cycle: (A) Colonization (B) Infection (C) Inoculation (D) Penetration
Choose the correct answer from the options given below:

Correct option is D

The correct answer is (D) (C), (D), (B), (A)

Explanation:
• The disease cycle represents the chain of events involved in the development of a disease.
• Inoculation (C): The initial contact of a pathogen (inoculum) with a sensitive part of the plant.
• Penetration (D): The entrance of the pathogen into the plant body, either directly through the cuticle, through natural openings (stomata), or through wounds.
• Infection (B): The process by which the pathogen establishes contact with the host cells and starts procuring nutrients. This is when the relationship is established.
• Colonization (A): The growth and spread of the pathogen through the host tissues.

Information Booster:
• Following colonization, 'Invasion' and 'Growth and Reproduction' of the pathogen occur, eventually leading to 'Symptom Development'.
• The period between infection and the appearance of symptoms is called the 'Incubation Period'.

Additional Knowledge:
• Pre-penetration: Events before penetration like spore germination.
• Latent period: Time from infection to the production of new inoculum.
• Survival/Overwintering: The stage where the pathogen survives in the absence of a host.