GENERAL EFFECTS OF DISEASE ON CROP PRODUCTION

Subject:

Agricultural Science

Class:

SS 2

Term:

Second Term / 2nd Term

Week:

Week 7

Topic:

GENERAL EFFECTS OF DISEASE ON CROP PRODUCTION

Previous Knowledge: The pupils have previous knowledge of

     DISEASES OF CROPS  

that was taught in their previous lesson.

Behavioural  Objectives : At the end of the lesson, learners will be able to

• Say the general effects of diseases on crops
• Mention ways by which diseases spread from one crop to another
• Explain how crop diseases can be controlled

Instructional Materials 

• Wall charts
• Online Resource
• Textbooks
• Laptop
• Crop samples
• Pictures that are related to the subject matter
• Flash cards
• www.edudelighttutors.com

Methods of Teaching 

• Role modelling
• Questions and Answers
• Explanation
• Discussion
• Recitation
• Imitation
• Story Telling
• Dramatization

WEEK SEVEN                              

GENERAL EFFECTS OF DISEASE ON CROP PRODUCTION

1. Disease generally reduce the yield of crops
2. They reduce the quality of crops
3. They can cause malformation of parts of plants
4. They can kill or cause death of a whole plant
5. They cause reduction in the income of a farmer

WAYS BY WHICH DISEASE SPREADS ON CROP FARM

1. By rain splash
2. Through the use of contaminated equipment
3. The use of infected planting materials
4. Wind blowing pathogens to other crops
5. Through animals
6. Through insect vectors
7. Through visitors to the farm
8. Through weeds

GENERAL CONTROL OF CROP PLANT DISEASES

1. Cultural method: the use of crop rotation, planting of resistant varieties, tillage practice, regular weeding, pruning etc. to control or prevent disease
2. Biological control: this is the use of the natural enemy of the disease to reduce  or totally eliminate the disease
3. Chemical control: this involves the use of pesticides such as fungicides, nematicides, insecticides to prevent disease or control disease.

The topic is presented step by step

Step 1: The class teacher revises the old topic

Step 2: The class teacher introduces the new topic

Step 3: The class teacher allows the pupils to give their own contributions and gives room for pupils” participation

Class Teacher and Pupils Activities. Interaction or Participation 

This involves class teacher and pupils’ interaction, conversation, imitation or modeling through discussion, play method or just by recitation or asking and answering questions that are related to the topic that has just been taught.

EVALUATION 

SECTION A

1. The following are pathogens except _____. A. viruses B. bacteria C. fungi D. algae
2. Maize rust is caused by ______. A. bacteria B. fungi C. virus D. nematodes
3. Rosette disease of groundnut is caused by ____. A. fungus B. virus C. bacteria D. nematodes
4. Cocoa blackpod disease is caused by ______. A. virus B. bacteria C. fungi D. nematodes
5. Root knoll of tomato is caused by ______. A. nematode B. fungus C. bacteria D.virus

SECTION B

1. What is disease? 
2. List disease pathogens
3. Discuss briefly the cassava mosaic disease under the following headings
   • Casual organism
   • Transmission
   • Symptoms
   • Control

Conclusion : 

The class teacher concludes the lesson by giving the pupils some notes on the topic that has just been taught. He goes round to mark and he does the necessary corrections.