Neco 2025 Agricultural Science Question 7

Practice essay / theory question 7 from the 2025 Neco Agricultural Science examination. This question covers Crop Pests, Integrated Pest Management, Fall Armyworm .

Neco 2025 Agricultural Science Essay / Theory
Topics: Crop Pests Integrated Pest Management Fall Armyworm
Question 7 NECO • 2025 • AGRICULTURAL_SCIENCE • essay

A farmer cultivates maize on a total area of 5 hectares. During the growing season he observes an outbreak of fall armyworm (Spodoptera frugiperda) on his crop. He wishes to adopt an integrated pest management (IPM) approach that combines cultural, biological and chemical control methods.

Question Parts

( a )
Identify three biological control agents that are effective against fall armyworm and briefly describe the mode of action of each agent.
( b )
The farmer decides to use a synthetic insecticide that is supplied as a 200 g L⁻¹ formulation. The recommended field rate is 0.75 L per hectare. After the first application he has used 1.2 L of the formulation. Calculate the maximum additional area (in hectares) that can be treated with the remaining insecticide. Show all steps of your calculation.
( c )
Weekly monitoring of larval density (number of larvae per 10 plants) gave the following counts: Week 1 = 15, Week 2 = 9, Week 3 = 4, Week 4 = 2. Determine the percentage reduction in larval population from Week 1 to Week 4 and comment on the effectiveness of the control measures applied.
( d )
Discuss two cultural practices that can be incorporated into the farmer’s IPM programme to lower the incidence of fall armyworm and explain how these practices complement the chemical and biological controls mentioned earlier.

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About This Question

This is Neco 2025 Agricultural Science Question 7. It is one of the essay questions from the 2025 Neco Agricultural Science examination.

The question covers Crop Pests, Integrated Pest Management, Fall Armyworm .

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