Waec Model Questions Vol1 2019 Agricultural Science Question 8

Practice essay / theory question 8 from the 2019 Waec Model Questions Vol1 Agricultural Science examination. This question covers Plant Diseases, Cassava Mosaic Disease, Disease Epidemiology, Integrated Disease Management .

Waec Model Questions Vol1 2019 Agricultural Science Essay / Theory
Topics: Plant Diseases Cassava Mosaic Disease Disease Epidemiology Integrated Disease Management
Question 8 WAEC_MODEL_QUESTIONS_VOL1 • 2019 • AGRICULTURAL_SCIENCE • essay

A cassava farmer observed leaf‑spot symptoms on a portion of his 500‑plant field. A systematic survey recorded that 120 plants showed typical lesions of Cassava Mosaic Disease (CMD). For each infected plant, the average severity (percentage of leaf area affected) was estimated at 30%.

Question Parts

( a )
Define disease incidence and disease severity, and show how they are calculated.
( b )
Calculate the disease incidence (%) and the disease severity index (DSI) for the field using the data provided.

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About This Question

This is Waec Model Questions Vol1 2019 Agricultural Science Question 8. It is one of the essay questions from the 2019 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Plant Diseases, Cassava Mosaic Disease, Disease Epidemiology, Integrated Disease Management .

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