Gce Model Questions Vol1 2021 Agricultural Science Question 23

Practice objective / multiple choice question 23 from the 2021 Gce Model Questions Vol1 Agricultural Science examination.

Gce Model Questions Vol1 2021 Agricultural Science Objective / Multiple Choice Medium Difficulty
Question 23 GCE_MODEL_QUESTIONS_VOL1 • 2021 • AGRICULTURAL_SCIENCE • objective

In a 5‑ha field of tomato, a survey of 2 000 plants found 300 plants showing symptoms of early blight. Of the symptomatic plants, 150 have 30 % of their leaf area affected and the other 150 have 10 % affected. (a) Calculate the disease incidence (percentage of plants infected). (b) Calculate the overall disease severity index using the formula \( \text{DSI}= \frac{\sum (\text{severity %})}{\text{number inspected}\times 100}\times100 \). (c) If a fungicide application is recommended only when the DSI exceeds 5 %, advise whether treatment is justified.

Answer Options

Correct Answer A. Disease incidence = 15 %; DSI = 3 %; treatment not justified.
B. Disease incidence = 18 %; DSI = 3 %; treatment not justified.
C. Disease incidence = 15 %; DSI = 6 %; treatment justified.
D. Disease incidence = 12 %; DSI = 4 %; treatment not justified.
Correct Answer
A
Correct Option:
Disease incidence = 15 %; DSI = 3 %; treatment not justified.

About This Question

This is Gce Model Questions Vol1 2021 Agricultural Science Question 23. It is one of the objective questions from the 2021 Gce Model Questions Vol1 Agricultural Science examination.

Difficulty level: Medium .

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