Neco 2025 Agricultural Science Question 8

Practice essay / theory question 8 from the 2025 Neco Agricultural Science examination. This question covers Plant Diseases, Cassava Leaf Spot, Disease Management .

Neco 2025 Agricultural Science Essay / Theory
Topics: Plant Diseases Cassava Leaf Spot Disease Management
Question 8 NECO • 2025 • AGRICULTURAL_SCIENCE • essay

A cassava farmer has noticed the appearance of circular brown lesions surrounded by a yellow halo on the older leaves of his crop. The lesions have gradually spread to younger leaves, and the disease appears to be worsening during the rainy season.

Question Parts

( a )
Identify the most likely causal pathogen of the described symptoms and state its taxonomic group (e.g., genus and species).
( b )
The pathogen produces conidia that are dispersed by wind. If an average infected leaf releases 2.5 × 10⁵ conidia per day and the farmer currently has 120 infected leaves, estimate the total number of conidia released over a period of one week. Show your working.
( c )
The farmer intends to apply a copper‑based fungicide at a rate of 0.5 kg of copper per hectare. He possesses 12.5 kg of a commercial product that contains 20 % copper sulphate (by weight). Determine how many hectares can be treated with the available product. Include all calculation steps.
( d )
Explain how rotating cassava with a non‑host crop can interrupt the disease cycle, mentioning the specific survival structures of the pathogen and the typical period they can persist in the soil.

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About This Question

This is Neco 2025 Agricultural Science Question 8. It is one of the essay questions from the 2025 Neco Agricultural Science examination.

The question covers Plant Diseases, Cassava Leaf Spot, Disease Management .

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