Neco Model Questions Vol1 2017 Agricultural Science Question 8

Practice essay / theory question 8 from the 2017 Neco Model Questions Vol1 Agricultural Science examination. This question covers Plant diseases, Disease epidemiology, Disease management, Incidence calculation .

Neco Model Questions Vol1 2017 Agricultural Science Essay / Theory
Topics: Plant diseases Disease epidemiology Disease management Incidence calculation
Question 8 NECO_MODEL_QUESTIONS_VOL1 • 2017 • AGRICULTURAL_SCIENCE • essay

A smallholder grows 200 tomato plants in a raised bed. During the rainy season, 30 plants show wilting, yellowing leaves and brown vascular streaks, while 20 other plants develop circular leaf spots with a grey‑white centre. The farmer suspects bacterial wilt and early blight respectively.

Question Parts

( a )
Identify the causal agents of the two diseases and describe the primary mode of spread for each.
( b )
Calculate the disease incidence for each disease as a percentage of the total plant population.
( c )
Discuss three cultural, two biological and one chemical control measures that could be incorporated into an integrated disease management plan for the two diseases. Explain how each measure reduces disease spread or severity.
( d )
Assuming the cost of applying the copper fungicide to the whole bed is ₦8 000 and the expected yield loss from early blight at 10 % incidence is 0.3 t ha⁻¹ (market price ₦30 000 t⁻¹), determine whether the chemical control is economically justified. Show your calculation.

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About This Question

This is Neco Model Questions Vol1 2017 Agricultural Science Question 8. It is one of the essay questions from the 2017 Neco Model Questions Vol1 Agricultural Science examination.

The question covers Plant diseases, Disease epidemiology, Disease management, Incidence calculation .

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