Neco 2019 Agricultural Science Question 8

Practice essay / theory question 8 from the 2019 Neco Agricultural Science examination. This question covers Plant Diseases .

Neco 2019 Agricultural Science Essay / Theory
Topic: Plant Diseases
Question 8 NECO • 2019 • AGRICULTURAL_SCIENCE • essay

A farmer observes wilting, yellowing of leaves and stunted growth in a 3‑hectare tomato field. Laboratory analysis confirms the disease is Fusarium wilt caused by Fusarium oxysporum f.sp. lycopersici. The farmer seeks an effective management plan.

Question Parts

( a )
Describe the mode of infection of Fusarium oxysporum in tomato plants and list the typical symptoms that develop.
( b )
Historical data show that when disease incidence is 30 % the average yield loss is 25 % of the potential yield. Assuming a linear relationship between incidence and loss, estimate the expected yield loss if disease incidence rises to 45 %.
( c )
Propose an integrated disease‑management strategy that includes at least three control measures (cultural, chemical, biological or resistant varieties). For each measure, explain the principle behind it and how it reduces Fusarium wilt.

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About This Question

This is Neco 2019 Agricultural Science Question 8. It is one of the essay questions from the 2019 Neco Agricultural Science examination.

The question covers Plant Diseases .

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