Agricultural Pests and Pest Control Strategies for SS 1

Class: SS 1
Term: Second Term
Week: 9
Age: 15 years
Duration: 60 minutes
Subject: Biology
Curriculum Theme: Society and Environmental Biology
Focal competence: Using agricultural practices and control of pests to manage their small-scale farms
Key competencies/values: Communication; Environmental Literacy; Entrepreneurship
Skills:

• Identifying agricultural pests
• Applying pest control measures

Previous Lesson: Animal Husbandry and Irrigation Methods
Topic: Basic Agricultural Practices: Agricultural Pests.; Pest Control Strategies
Subject Matter: Agricultural Pests, Pest Control Strategies

Specific Objectives

By the end of the lesson, pupils/students should be able to:

Cognitive Domain

• Define agricultural pests.
• State examples of common agricultural pests.
• List different strategies for pest control.

Affective Domain

• Appreciate the importance of pest control in agriculture.
• Develop an interest in sustainable farming practices.

Psychomotor Domain

• Identify various agricultural pests from images or descriptions.
• Suggest appropriate pest control strategies for specific pest problems.

Reference Materials

The following resources were used in planning this lesson:

• 2025 New Revised Senior Secondary Education Curriculum (SSEC)
• Relevant State Unified Scheme of Work
• A suitable Biology textbook for Senior Secondary School 1
• The HeadTeacher Scheme of work For The New Revised Senior Secondary Education Curriculum (SSEC)

Instructional Materials

The teacher will teach this lesson with the aid of:

• Pictures or charts of common agricultural pests (e.g., locusts, aphids, rodents, weevils)
• Video clips and simulations of different agricultural practices, including pest damage and control methods
• Samples of damaged crops or stored produce (if available and safe)
• Farm inputs and tools (e.g., a small sprayer, hoe, cutlass for demonstration of physical control)
• Whiteboard/Blackboard and markers/chalk

Rationale for the Lesson

This lesson is important because it equips students with knowledge about organisms that damage crops and livestock, which directly impacts food security and agricultural productivity. Understanding pest control strategies helps students appreciate sustainable farming practices and develop practical skills for managing small-scale farms, fostering environmental literacy and entrepreneurial thinking.

Prerequisite/Previous Knowledge

Students should have basic knowledge of common farm animals and crops, as well as an understanding of the general importance of agriculture.

Lesson Content/Board Summary

Basic Agricultural Practices: Agricultural Pests; Pest Control Strategies

Agricultural Pests

Agricultural pests are organisms that cause damage to crops, stored produce, livestock, or farm structures, leading to economic losses and reduced agricultural productivity. These organisms compete with humans for food resources and can transmit diseases to plants and animals.

Common types of agricultural pests include:

1. Insects: These are the most common agricultural pests. They damage crops by chewing leaves, sucking sap, boring into stems or fruits, and laying eggs on plant parts.
   1. Examples: Locusts (eat entire plants), Aphids (suck sap from leaves and stems, causing stunted growth and transmitting viruses), Grasshoppers (defoliate plants), Weevils (infest stored grains like maize and beans), Armyworms (feed on leaves and stems).
   2. Observable Evidence: Holes in leaves, wilting plants, stunted growth, presence of insects on plants, sticky residue (honeydew from aphids), damaged grains.
   3. Structure-Function Relationship:
      1. Chewing mouthparts (e.g., grasshoppers, locusts): Strong mandibles adapted for biting and tearing plant tissues.
      2. Sucking mouthparts (e.g., aphids): Piercing-sucking mouthparts (stylets) adapted for penetrating plant tissues and extracting sap.
      3. Ovipositors (e.g., some weevils): Specialized structures for laying eggs into plant tissues or seeds.
2. Birds: Certain bird species feed on ripening grains, fruits, and newly planted seeds.
   1. Examples: Weaver birds, sparrows, pigeons.
   2. Observable Evidence: Missing seeds, peck marks on fruits, reduced grain yield.
3. Mammals: Rodents and larger mammals can cause significant damage to crops and stored produce.
   1. Examples: Rats, mice (eat stored grains, root crops, and seedlings), Bush pigs, Monkeys (damage fruits and tubers).
   2. Observable Evidence: Gnaw marks on crops or structures, burrows, droppings, missing produce.
4. Nematodes (Roundworms): Microscopic worms that live in the soil and attack plant roots, causing stunted growth and reduced yield.
   1. Examples: Root-knot nematodes.
   2. Observable Evidence: Galls or swellings on roots, yellowing leaves, wilting plants (often mistaken for nutrient deficiency).
5. Weeds: Unwanted plants that grow among cultivated crops, competing for sunlight, water, nutrients, and space.
   1. Examples: Spear grass, Tridax, Water hyacinth.
   2. Observable Evidence: Overgrowth of unwanted plants, stunted crop growth, reduced yield.

Pest Control Strategies

Pest control strategies are methods used to manage or eliminate agricultural pests to protect crops and livestock. The goal is to reduce pest populations to an economically acceptable level, not necessarily to eradicate them completely.

Common pest control strategies include:

1. Chemical Control: This involves the use of pesticides (chemicals) to kill or repel pests.
   1. Types of Pesticides:
      1. Insecticides: Kill insects.
      2. Herbicides: Kill weeds.
      3. Rodenticides: Kill rodents.
      4. Fungicides: Control fungal diseases (though fungi are pathogens, not typically “pests” in the same sense as insects/mammals, they are often grouped under chemical control for crop protection).
   2. Advantages:
      1. Rapid and effective in reducing pest populations.
      2. Easy to apply over large areas.
      3. Can save crops quickly in severe infestations.
   3. Disadvantages:
      1. Can be harmful to humans, beneficial insects (like pollinators), and other non-target organisms.
      2. May lead to pest resistance over time.
      3. Can pollute soil, water, and air.
      4. High cost.
2. Biological Control: This method uses natural enemies of pests to control their populations.
   1. Examples:
      1. Using ladybirds to feed on aphids.
      2. Introducing parasitic wasps to lay eggs inside pest larvae.
      3. Using bacteria (e.g., Bacillus thuringiensis) that are toxic to certain insect larvae.
   2. Advantages:
      1. Environmentally friendly, no chemical residues.
      2. Sustainable and long-lasting effects.
      3. Pests are less likely to develop resistance.
   3. Disadvantages:
      1. Slower acting than chemical control.
      2. May not be effective against all pests.
      3. The introduced biological agent might sometimes affect non-target species.
3. Physical Control: This involves direct physical methods to remove or destroy pests.
   1. Examples:
      1. Hand-picking: Manually removing large insects or weeds from plants.
      2. Trapping: Using traps (e.g., sticky traps for flying insects, rat traps for rodents).
      3. Fencing: Erecting fences to keep out larger animals like goats or bush pigs.
      4. Burning: Burning crop residues to destroy pests and their eggs (must be done carefully).
      5. Flooding: Flooding fields to drown soil pests.
   2. Advantages:
      1. Environmentally safe.
      2. Can be effective for small-scale farming.
      3. No chemical residues.
   3. Disadvantages:
      1. Labour-intensive for large areas.
      2. May not be practical for all types of pests or farms.
4. Cultural Control: These are farming practices that make the environment less favourable for pests or enhance natural enemies.
   1. Examples:
      1. Crop rotation: Changing the type of crop grown in a field each season to break pest life cycles.
      2. Timely planting and harvesting: Planting crops when pests are less active and harvesting before severe infestation.
      3. Sanitation/Field hygiene: Removing crop residues, weeds, and debris that can harbour pests.
      4. Use of resistant varieties: Planting crop varieties that are naturally resistant to certain pests.
      5. Intercropping: Planting different crops together to deter pests (e.g., strong-smelling plants can repel pests from main crops).
   2. Advantages:
      1. Sustainable and cost-effective.
      2. Reduces reliance on chemicals.
      3. Improves overall soil health and crop vigour.
   3. Disadvantages:
      1. May require careful planning and knowledge of pest biology.
      2. Effects may not be immediate.

Teaching Methods/Instructional Techniques

Discussion, Explanation, Question and Answer, Demonstration, Video Presentation, Guided Practice

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Activating Prior Knowledge

Teacher’s Activity: The teacher greets the students and asks them to recall what they know about farming and the challenges farmers face in growing crops or raising animals.

Pupils’ Activity: Pupils respond by mentioning various challenges such as drought, poor soil, and sometimes, “things that eat crops.”

Learning Point: Challenges in farming

Step 2: Identification of Agricultural Pests

Time: 10 minutes

Teaching Skill: Brainstorming/Explanation

Teacher’s Activity: The teacher guides students to brainstorm and discuss organisms that destroy crops or harm farm animals. The teacher defines agricultural pests and shows pictures of common pests like locusts, aphids, rats, and weeds, explaining their observable evidence and how their structures help them cause damage.

Pupils’ Activity: Pupils mention various pests they know and observe the pictures, asking questions about the damage caused.

Learning Point: Meaning of agricultural pests

Step 3: Types and Examples of Pests

Time: 10 minutes

Teaching Skill: Elaboration/Discussion

Teacher’s Activity: The teacher further explains different categories of pests (insects, birds, mammals, nematodes, weeds) with more specific examples relevant to Nigeria. The teacher highlights the structure-function relationships of some pests, e.g., chewing mouthparts of grasshoppers vs. sucking mouthparts of aphids.

Pupils’ Activity: Pupils discuss the examples and relate them to their experiences or observations in their communities.

Learning Point: Categories of agricultural pests

Step 4: Introduction to Pest Control Strategies

Time: 10 minutes

Teaching Skill: Video Presentation/Explanation

Teacher’s Activity: The teacher introduces the concept of pest control and guides students to watch video clips and simulations showing various agricultural practices, including methods used to control pests. The teacher then introduces the main control strategies: chemical, biological, physical, and cultural.

Pupils’ Activity: Pupils watch the video clips attentively and discuss what they observed regarding pest control methods.

Learning Point: Overview of pest control

Step 5: Detailed Discussion of Control Strategies

Time: 10 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher explains each pest control strategy (chemical, biological, physical, cultural) in detail, providing examples, advantages, and disadvantages for each. The teacher may demonstrate simple physical control methods using farm tools (e.g., hand-picking, hoeing weeds).

Pupils’ Activity: Pupils listen, ask questions for clarification, and participate in discussions about the pros and cons of each method.

Learning Point: Types of pest control

Step 6: Application of Control Strategies

Time: 5 minutes

Teaching Skill: Guided Practice

Teacher’s Activity: The teacher presents various pest scenarios (e.g., “Your maize farm is infested with grasshoppers,” “Rats are eating your stored yam tubers”) and asks students to suggest appropriate control strategies for each, justifying their choices.

Pupils’ Activity: Pupils apply their knowledge to suggest suitable pest control measures for the given scenarios.

Learning Point: Applying control methods

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. What are agricultural pests?
2. Give two examples of insect pests and explain the damage they cause.
3. Mention three different strategies for controlling agricultural pests.
4. State one advantage and one disadvantage of chemical control.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding pests and control

Step 8: Note-Taking

Time: 10 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils/students to copy the essential Board Summary notes on agricultural pests and control strategies into their notebooks.

Pupils’ Activity: Pupils/students copy the notes carefully into their notebooks.

Learning Point: Recording lesson notes

Step 9: Conclusion

Time: 5 minutes

Teaching Skill: Consolidation

Teacher’s Activity: The teacher summarises the key points of the lesson, reiterating the importance of identifying pests and applying appropriate control measures for successful agricultural practice. The teacher encourages students to observe pest activities in their environment.

Pupils’ Activity: Pupils listen and ask any final questions.

Learning Point: Reinforcing pest management

Continuous Assessment/Further Study

Type: Homework/Further Reading

Instruction: Answer the following questions in your notebook and research more about integrated pest management (IPM).

1. Differentiate between biological control and physical control, giving one example for each.
2. Imagine you have a small garden. Describe how you would identify a pest problem and what two non-chemical methods you would use to control it.
3. Research and write a short paragraph on what “Integrated Pest Management (IPM)” means and why it is considered a sustainable approach.

Lesson Keywords

• Pests – Organisms that cause damage to crops, livestock, or stored produce.
• Insecticides – Chemicals used to kill insects.
• Herbicides – Chemicals used to kill weeds.
• Biological control – Using natural enemies to control pests.
• Physical control – Direct physical methods to remove or destroy pests.
• Cultural control – Farming practices that make the environment less favourable for pests.
• Crop rotation – Changing crops in a field to break pest cycles.
• Aphids – Small insects that suck sap from plants.
• Weevils – Beetles that infest stored grains.

Differentiation

For students who grasp concepts quickly, encourage them to research specific pest outbreaks in Nigeria and the control measures implemented. Provide additional reading materials on the economic impact of pests. For students needing more support, provide simplified diagrams of pests and control methods, and offer one-on-one guidance during activity sessions, focusing on identifying common pests and basic control methods.

Suggested Lesson Videos

For further understanding, search on YouTube for:

• agricultural pests and control ss1 biology
• types of pest control methods for crops