Question

Classify crop diseases on the basic of the mode of occurrence with one example of each

Answer 1

Answer:

Endemic : when a diseases more or less constantly

prevalent from year to year in a moderate to severe

form in a particular country. E.g., Wart disease of

potato is endemic to Darjeeling

 Epidemic or epiphytotic: A disease occurring

periodically but in a severe form involving major

area of the crop. it may be constantly present in

locality but assume severe form occasionally e.g.

Rust, Late blight, Mildews.

 Sporadic: Diseases which occur at very

irregular interval and location in a moderate

to severe form e.g., leaf blights, wilt

 Pandemic: diseases occurring throughout the

continent or sub-continent resulting in mass

mortality e.g., Late blight of potato