Waec Model Questions Vol1 2023 Agricultural Science Question 7

Practice essay / theory question 7 from the 2023 Waec Model Questions Vol1 Agricultural Science examination. This question covers Crop Pests, Integrated Pest Management, Pesticide Dosage, Environmental Impact .

Waec Model Questions Vol1 2023 Agricultural Science Essay / Theory
Topics: Crop Pests Integrated Pest Management Pesticide Dosage Environmental Impact
Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2023 • AGRICULTURAL_SCIENCE • essay

A farmer in the North Central zone of Nigeria has been experiencing severe defoliation of his maize crop during the early rainy season. Field observations reveal the presence of a nocturnal, leaf‑feeding insect that creates ragged holes in the foliage and leaves behind frass. The farmer wishes to adopt an integrated approach to manage the pest while minimising environmental damage.

Question Parts

( a )
Identify the pest described and give its scientific name.
( b )
Outline the complete life cycle of the pest, indicating the duration of each stage under typical Nigerian conditions.
( c )
Propose an integrated pest‑management (IPM) programme for this pest. Include at least one cultural, one biological and one chemical control method, and briefly justify the choice of each.
( d )
The recommended chemical control is a synthetic insecticide formulated at 200 g L⁻¹. The label advises a spray volume of 0.5 L ha⁻¹. The farmer’s field measures 2 ha. Calculate the total volume of spray required and the amount of active ingredient (in grams) that will be applied to the whole field.
( e )
Discuss two possible adverse environmental effects of using the chemical control and suggest one management practice to mitigate each effect.

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About This Question

This is Waec Model Questions Vol1 2023 Agricultural Science Question 7. It is one of the essay questions from the 2023 Waec Model Questions Vol1 Agricultural Science examination.

The question covers Crop Pests, Integrated Pest Management, Pesticide Dosage, Environmental Impact .

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