A farmer monitors a 2‑ha maize field for Fall Armyworm. The economic injury level (EIL) is given by $\text{EIL}=\dfrac{C}{V\times I\times D}$, where $C$ is the control cost per ha ($\text{₦}12{,}000$), $V$ is the market value per kg of maize ($\text{₦}150$), $I$ is the injury per larva (0.02 kg larva⁻¹), and $D$ is the proportion of the pest population killed by one spray (0.6). The farmer counts 150 larvae per ha. Determine whether the pest population exceeds the EIL and if control is justified. Also compute the expected total yield loss (in kg) for the whole field if no control is applied.

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EIL ≈ 6,667 larvae/ha; observed 150 < EIL → control not justified; total expected loss = 6 kg

Gce Model Questions Vol1 2024 Agricultural Science Question 24

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