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PPT610S - PLANT PROTECTION - 2ND OPP - JULY 2023 |
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n Am I BI A u n IVE Rs ITY
OF SCIEnCE Ano TECHnOLOGY
FACULTYOF HEALTH, NATURAL RESOURCESAND APPLIED SCIENCES
SCHOOLOF AGRICULTUREAND NATURAL RESOURCESSCIENCES
DEPARTMENT OF AGRICULTURALSCIENCESAND AGRIBUSINESS
QUALIFICATION: BACHELOROF SCIENCEIN HORTICULTURE
QUALIFICATION CODE: 07BHOR
LEVEL: 7
COURSECODE: PPT61OS
COURSENAME: PLANT PROTECTION
SESSION:
JULY 2023
PAPER:
THEORY
DURATION: 3 HOURS
MARKS:
100
SECONDOPPORTUNITY/SUPPLEMENTARYEXAMINATION QUESTION PAPER
EXAMINER{S) Dr Norman Muzhinji
MODERATOR: Dr Edgar Mowa
INSTRUCTIONS
1. Answer ALL the questions.
2. Write clearly and neatly.
3. Number the answers clearly.
PERMISSIBLEMATERIALS
1. Examination question paper
2. Answering book
THIS QUESTION PAPERCONSISTSOF 3 PAGES(Including this front page)
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1. Define or explain the following terms used in plant protection with examples.
i. Systemic insecticide.
[2]
ii. Post-emergence herbicide application.
[2]
2. Briefly, explain the impact of plant pests to the horticultural sector in Namibia.
[S]
3 a. Name a plant disease of your choice and explain the aetiology and epidemiology of the
disease and recommend appropriate recommended control measures.
[20]
b. Explain the importance of epidemiology in disease management?
[4]
4. Using your own examples of pest/ disease and crop; explain how crop rotation can be
used to control pest and plant diseases.
[10]
5. a. Name four (3) advantages of using biological pest control methods.
[2]
b. List three (3) precautions to keep in mind when using chemical control measures. [3]
6. Tomato spotted wilt (caused by tomato spotted wilt virus) is generally considered a
monocyclic disease of tomatoes. Explain what this means.
[2]
7. Damping off is a disease that affects seedlings in the nursery.
a. Describe the symptoms of damping-off on seedlings and factors favouring its
development.
[4]
b. Describe the integrated pest management of damping off in the nursery seed bed.
[4]
8. a. What are three ways that a plant virus can be transmitted from one plant to another
in a field?
[3]
b. Why is management of plant viral diseases always based on prevention, rather than
curing?
[2]
c. A potato grower in Tsumeb sprayed his virus infected potato plants with a pesticide.
Is the use of pesticide to manage viruses in the field a correct procedure? Yes or No.
Justify your answer.
[2]
Suggest to the farmer any three strategies that he can use to prevent future outbreak
of viral diseases in his potato field.
[3]
9. a. Explain why weeds are a problem in conservation agricultural systems? Explain in
detail how you would address the problem.
[6]
b. Weeds can be controlled by mechanical and biological methods. For each of these
methods, describe the advantages and disadvantages of each .
[8]
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10. Tuta absoluta is one of the most destructive pests in Namibia causing yield losses in
potato and tomato production. What will be the disadvantages of using insecticide for
controlling Tuta absoluta on potato.
[4]
11. As a horticulturalist responsible for production of quality tomatoes and potatoes at
Mashare irrigation scheme, you have been using insecticides to control Tuta absoluta in
potato fields for several years, but it's no longer effective. Explain two possible causes of
what could have led to this development and discuss ways you would deal with such a
situation.
[10]
12. Mention any four strategies that you would use to reduce the primary sources of
inoculum of any pathogen of your choice.
[4]
THEEND
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