Neco 2022 Agricultural Science Question 7

Practice essay / theory question 7 from the 2022 Neco Agricultural Science examination. This question covers Crop Pests .

Neco 2022 Agricultural Science Essay / Theory
Topic: Crop Pests
Question 7 NECO • 2022 • AGRICULTURAL_SCIENCE • essay

A farmer observed that on his 2.5 ha maize field, the leaves show characteristic "window‑pane" lesions and a white cottony mass on the undersides. He estimates that 15% of the leaf area is affected and that, if untreated, the yield loss would be about 0.8 t ha⁻¹. The recommended pesticide is Cypermethrin 10 % EC to be applied at 2.5 L ha⁻¹ for a spray volume of 400 L ha⁻¹. The pesticide label states that the maximum safe residue on maize is 0.05 mg kg⁻¹ and the pre‑harvest interval is 7 days. The farmer plans to harvest 30 days after application.

Question Parts

( a )
Identify the pest causing the symptoms and describe its life cycle briefly.
( b )
Calculate the total amount (in litres) of Cypermethrin 10 % EC required for the whole field.
( c )
Determine whether the recommended application rate complies with the maximum residue limit, assuming that each litre of the 10 % EC contains 100 g of active ingredient and that 1 g of active ingredient results in 0.2 mg kg⁻¹ residue in the grain at harvest. Show your calculation.
( d )
Recommend an integrated pest‑management (IPM) strategy for this pest, including at least three control measures, and justify each.

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About This Question

This is Neco 2022 Agricultural Science Question 7. It is one of the essay questions from the 2022 Neco Agricultural Science examination.

The question covers Crop Pests .

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