Neco 2017 Agricultural Science Question 8
Practice objective / multiple choice question 8 from the 2017 Neco Agricultural Science examination.
In a 4‑ha tomato field a survey shows that \(30\%\) of the plants are infected with early blight with an average leaf‑area severity of \(40\%\), and \(10\%\) are infected with bacterial wilt with an average plant‑death severity of \(70\%\). The disease‑severity index (DSI) is calculated as \(\text{DSI}= \sum (\text{incidence}\times\text{severity})/100\). A fungicide reduces early‑blight severity by \(25\%\) (relative) while a bactericide reduces bacterial‑wilt incidence by \(50\%\) (relative). Compute the original DSI, the DSI after treatment, and state whether the final DSI is below the acceptable threshold of \(20\).
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About This Question
This is Neco 2017 Agricultural Science Question 8. It is one of the objective questions from the 2017 Neco Agricultural Science examination.
Difficulty level: Medium .
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