Gce Model Questions Vol1 2024 Agricultural Science Question 8

Practice essay / theory question 8 from the 2024 Gce Model Questions Vol1 Agricultural Science examination. This question covers Plant Diseases, Tomato leaf spot, Disease severity index .

Gce Model Questions Vol1 2024 Agricultural Science Essay / Theory

Topics: Plant Diseases Tomato leaf spot Disease severity index

Question 8 GCE_MODEL_QUESTIONS_VOL1 • 2024 • AGRICULTURAL_SCIENCE • essay

A farmer observes leaf spots on his tomato crop. A survey of 200 plants gave the following distribution of disease severity: - Immune (0–5 % leaf area affected): 30 plants - Mild (6–25 %): 80 plants - Moderate (26–50 %): 60 plants - Severe (>50 %): 30 plants The observed symptoms are circular brown lesions with yellow halos on the lower leaves.

Question Parts

( a )

Calculate the disease incidence and the Disease Severity Index (DSI) using the formula: DSI = [ Σ (severity class midpoint × number of plants) ] ÷ (total plants × 100) × 100. Show all steps.

( b )

Identify the most likely causal pathogen based on the symptom description and propose two cultural and two chemical control measures suitable for this disease.

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About This Question

This is Gce Model Questions Vol1 2024 Agricultural Science Question 8. It is one of the essay questions from the 2024 Gce Model Questions Vol1 Agricultural Science examination.

The question covers Plant Diseases, Tomato leaf spot, Disease severity index .

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