Neco 2023 Agricultural Science Question 7

Practice essay / theory question 7 from the 2023 Neco Agricultural Science examination. This question covers Crop Pests .

Neco 2023 Agricultural Science Essay / Theory
Topic: Crop Pests
Question 7 NECO • 2023 • AGRICULTURAL_SCIENCE • essay

A farmer cultivates 1 ha of maize. The potential yield without pest damage is 5 tonnes per hectare and the market price is ₦30,000 per tonne. Stem borer infestation reduces yield by 0.05 tonnes for each 1% increase in infestation. The cost of applying an appropriate insecticide is ₦12,000 per hectare. Using the Economic Injury Level (EIL) formula \(EIL = \dfrac{C}{V \times I}\) where C is the cost of control per hectare, V is the market price per tonne and I is the yield loss (tonne) per 1% infestation, answer the following:

Question Parts

( a )
Calculate the Economic Injury Level (percentage infestation) for the stem borer.
( b )
If a field inspection shows a stem‑borer infestation of 12%, state whether control is justified and give a brief justification.
( c )
List three cultural, two biological and two chemical control measures suitable for stem borer and early‑season aphids. For chemical control, mention one advantage and one disadvantage.
( d )
Explain two mechanisms by which stem‑borer populations can develop resistance to insecticides and suggest one management practice to delay resistance.

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About This Question

This is Neco 2023 Agricultural Science Question 7. It is one of the essay questions from the 2023 Neco Agricultural Science examination.

The question covers Crop Pests .

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