GENERAL PREVENTION AND CONTROL OF CROP PESTS
Subject:
Agricultural Science
Class:
SS 2
Term:
Second Term / 2nd Term
Week:
Week 9
Topic:
GENERAL PREVENTION AND CONTROL OF CROP PESTS
Previous Knowledge: The pupils have previous knowledge of
that was taught in their previous lesson.
Behavioural Objectives : At the end of the lesson, learners will be able to
- Write out the general prevention and control of crop pests
- Say the methods of crop pest control
- Mention types of crop pests
- Write out the economic importance of Pests of crops
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 NINE
GENERAL PREVENTION AND CONTROL OF CROP PESTS
CONTENT
- Physical control
- Chemical control
- Biological control
- Cultural control
METHODS OF PEST CONTROL
Crop pests can be prevented or controlled through the following methods:
- Physical control
- Cultural control
- Biological control
- Chemical control
PHYSICAL CONTROL
This involves the physical removal of pests by:
- Hand picking of insects and larvae
- Setting traps to catch rodents
- Shooting rodents with gun
- Fencing round the farm with wire nets.
- Use of scarecrow.
EVALUATION
- List the methods of pest control
- List three ways by which pests can be removed physically
CULTURAL CONTROL
This method involves the use of farm practices to prevent or control pests, examples of cultural control are:
- Practicing crop rotation
- Use of pest resistant varieties of crops
- Appropriate tillage operations
- Burning crop residues
- Timely planting of crops
- Proper weeding or sanitation
- Timely harvesting
- Close season practices (no living plant is allowed for a certain period).
BIOLOGICAL CONTROL
This involves the introduction of natural enemies of pests to control or keep the pests population under control. Such enemies eat up or feed on these pests, thereby reduce the population of the pests.
EVALUATION
- List two cultural control of pests
- Explain biological pest control
CHEMICAL CONTROL
This involves the use of chemical called pesticides to control pest of crop plants. Examples of pesticides are insecticide, rodenticide, avicide etc.
Examples of chemicals used to control pests are:
- Insecticides – for controlling insect pest e.g grasshopper
- Rodenticides – chemical control for rodents such as rats
- Avicides – for controlling bird pest
- Nematicides – chemical used to control nematodes. E.g worms
FORMS OR GROUPS OF INSECTICIDES
The four groups and the mode of action are:
| Group | Mode of action |
|
Contact |
|
Systemic |
|
Stomach (Ingestion) |
|
Fumigation |
SIDE EFFECT OF THE VARIOUS PREVENTIVE AND CONTROL METHOD OF DISEASE AND PEST OF CROPS
Use of these control methods have their effect, these effects includes
- Death of some beneficial insect and soil organism, toxic exposure to animals and man, chemical residue in the environment, washing away of chemicals into aquatic life e.t.c when chemical control method is employed.
- Organisms introduced may attack cultivated crops or stored grains, predators might not feed on targeted pest and deviate to feeding on beneficial organisms, the activities of new organism might cause an ecosystem imbalance when biological control method is employed.
- When cultural control method is employed, the use of bush burning method might get out of hand thereby destroying soil structure, spread to other farms, loss of organic matter and lead to death of beneficial microbes.
GENERAL EVALUATION
- What are insecticides?
- List the three forms of insecticides and their mode of action
- What are avicides, rodenticide and nematicides are used to control
- List five economic importance of crop pests.
Presentation :
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
- _____ is responsible for damages in crops. A. weeds B. water C. air D. pests
- The following are rodents except _____. ?A. rat B. grasscutter C.squirrel D.monkey
- The following are bitting and chewing insect except ____. A. termites B. capsids C.locust D. beetles
- Stem burrowers will attack A. cereals B. legumes C. tubers D. spices
- Cotton strainers and meleabugs are examples of _____ insects. A. biting B. chewing C. piercing D. burrowing
- Avicides are used to control _____. A. rodents B. birds C. insects D. pests
- The mode of action of liquid insecticide is_____. A. contact B. systemic C. stomach D. fumigation
- Weevils are _____ insects. A. biting B. chewing C. burrowing D. piercing
- The following are pests except. A. rodents B. earthworm C. monkeys D. nematodes
- The following are biting chewing insects except _____. A. butterfly B. locust C. grasshopper D. cricket
SECTION B
- A. What are pests
- List the five types of pests
- A. List five effects of pests in crop production
- List three control measures of plant disease
- What are crop pests?
- List the three classes of insect pests.
- List two side effects each of using
- Cultural control of pests
- Biological control of pests
- Chemical control of pests
- Physical control of pests
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.
