PLB423

Question 1

What is epiphytotics?

Answer 1

Epiphytotics means a sudden (or abnormal) destructive outbreak of a plant disease in an area.

Question 2

What is Epiphytology?

Answer 2

Epiphytology (or epidemiology) is the study of the outbreak of disease, its course, intensity, cause and effects, and other factors governing it.

Question 3

What are the classifications of plant disease outbreaks based on occurrence?

Answer 3

Plant disease outbreaks can be classified as Endemic, Epidemic, Pandemic, or Sporadic based on occurrence and geographical distribution.

Question 4

How can plant diseases be classified based on the plant part affected?

Answer 4

1. Localized disease - affecting only a part of the plant; 2. Systemic disease - affecting the entire plant.

Question 5

How can plant diseases be classified based on symptoms?

Answer 5

Based on symptoms, plant diseases can be classified as rusts, smuts, wilts, blights, cankers, mildews, rots, damping-off, die-back, scab, etc.

Question 6

How can plant diseases be classified based on the host plant?

Answer 6

Based on the host plant, diseases can be classified as cereal crop disease, root crop disease, forage crop disease, plantation crop disease, etc.

Question 7

What is an endemic disease?

Answer 7

Endemic disease is prevalent in, and confined to, a particular country or district. It is constantly present in a moderate to severe form in a specific area.

Question 8

What is an example of an endemic disease?

Answer 8

Examples include wart disease of potato (Synchytrium endobioticum) in Darjeeling, citrus canker (Xanthomonas axonopodis pv citri) in Asia, and sorghum rust (Puccinia purpurea) in Nigeria.

Question 9

What is an epidemic or epiphytotic?

Answer 9

An epiphytotic disease is one that occurs widely but periodically, causing severe losses or complete destruction.