At the end of the lesson, the pupils should be able to
mention invertebrates and vertebrate crop pest
explain the life cycles of pests
Instructional Materials :
Methods of Teaching :
Reference Materials :
Scheme of Work
9 Year Basic Education Curriculum
Classification of Pests
Classification based on the various parts of a crop plant they attack:
Stem borers: these are usually larvae of certain moths that bore into the stems of maize and feed on it. This result in the weakening and breaking of the stem.
Root feeders: these are insect larvae or adults found in the soil. They burrow into the ground and feed on yam tubers.
Leaf feeders: snails, beetles, grasshoppers eat up leaves of crops.
Younger shoot feeders: aphids, mealy bugs and scale bugs often pierce and suck out juices from younger shoots. Many sucking pests additionally transmit disease-causing organisms to the vegetation e.g. Cassava leaf mosaic virus is transmitted by white flies. Such pests are often known as vectors.
Fruits and seed feeders: these are moths, fruit flies, cotton strainers and some beetles eat their way into fruits and seeds causing great damage.
Damaged Crops in North Korea
A North Korean farmer assesses the damage done to his corn crop by poor growing conditions. In the mid-1990s severe flooding followed by droughts devastated the country’s agricultural output and led to serious food shortages. By the late 1990s North Korea was experiencing widespread famine.
Other invertebrate and vertebrate pests include:
Insects like flies, aphids
Mites and ticks.
Aphids on a Cabbage Plant
Aphids are small insects found throughout temperate regions of the world. They parasitize a variety of wild and commercially important plants by sucking out plant fluids. Because aphids exude a sweet, sticky fluid that can be used by certain species of ants, herds of aphids are often found guarded and tended by ants.
Life Cycles of Pests
Most insect pests have the following stages in their life cycle i.e. egg, larva, pupa, adult.
The adult pests usually feed on leaves and fruit of crops. Larva chews the bark of stems and feed on the phloem thereby damaging the crop. Insect pests go through either complete or incomplete life cycles but the larval and adult stages have been seen as causing most serious damages to crops.
Some examples of insect pest life cycles:
Yam beetle (undergoes complete metamorphosis), The adult feed on yam tubers in the ground.
Cotton Stainer (undergoes incomplete metamorphosis), the adults attack and damage cotton toll.
The topic is presented step by step
The class teacher revises the previous topics
He introduces the new topic
The class teacher allows the pupils to give their own examples and he corrects them when the needs arise
The class teacher wraps up or conclude the lesson by giving out short note to summarize the topic that he or she has just taught.
The class teacher also goes round to make sure that the notes are well copied or well written by the pupils.
He or she does the necessary corrections when and where the needs arise.
What is meant by life cycle?
Clarify the 2 varieties of life cycles.
Draw the life cycle of a named pest.
Briefly describe how pests have an effect on root tubers.
Explain the term Pests. What make them so necessary to man?
In what methods do Pests have an effect on the standard and amount of agricultural livestock produce?
Point out 5 pests and describe the methods they assault or attack crops and their impact on crops.
In what approach has mono-cultural observe in business agriculture contributed to the emergence of pests as a manufacturing issue?