Which of the following statements about the extent of infection and perpetuation of pathogens are correct?
(A) Disease which is confined to a particular part or organ is known as systemic disease.
(B) Arhar wilt is a soil-borne disease.
(C) Smut disease of cereals is seed-borne.
(D) Mildew and rusts are air-borne.
Choose the correct answer from the options given below:

Correct option is D

· Arhar wilt is a soil-borne fungal disease affecting pigeon pea crops.
· Smut diseases of cereals (like loose and covered smut) are seed-borne, affecting wheat, maize, and barley.
· Mildew and rust diseases spread through airborne spores, leading to rapid infection in fields.