Neco Model Questions Vol1 2021 Agricultural Science Question 8

Practice essay / theory question 8 from the 2021 Neco Model Questions Vol1 Agricultural Science examination. This question covers Plant Diseases .

Neco Model Questions Vol1 2021 Agricultural Science Essay / Theory

Topic: Plant Diseases

Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2021 • AGRICULTURAL_SCIENCE • essay

A horticulturalist grows tomatoes in a greenhouse covering 2000 m². The plants are spaced 0.5 m × 0.5 m, giving a total of 800 plants. During a rainy season the crop suffered from a fungal disease caused by Phytophthora infestans (late blight).

Question Parts

( a )

Explain the disease triangle and illustrate how each component (host, pathogen, environment) contributes to the occurrence of late blight in the described greenhouse.

( b )

The horticulturalist recorded the number of infected plants each week for four weeks as follows: Week 1 – 30 plants, Week 2 – 78 plants, Week 3 – 150 plants, Week 4 – 210 plants. Calculate the disease incidence (%) for each week and identify the week when the disease reached epidemic proportion (incidence > 20 %).

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About This Question

This is Neco Model Questions Vol1 2021 Agricultural Science Question 8. It is one of the essay questions from the 2021 Neco Model Questions Vol1 Agricultural Science examination.

The question covers Plant Diseases .

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