UU
Classify the plant disease on the basis of their
occurence.
Answers
Answer:
a) Endemic Diseases
The disease which is present in more or less constantly from year to year in the same area or crop field. In this case the pathogen is well established in the soil or other medium and survives there from season to season.
b) Epiphytotic Diseases ( or Epidemic Diseases)
The diseases which show widespread occurrence in an area but occur periodically. These diseases depends largely on the environmental conditions. In case of epiphytotic diseases, favourable environmental conditions may occur largely but the pathogen may be present irregularly. For example, the incidence of Late blight of potato (Phytophthora infestans).
c) Sporadic Disease
In cases, when epiphytotic diseases occur at very irregular intervals and locations and in relatively few intervals, these are termed as Sporadic diseases.
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