Examples of harmful insects

Subject: AGRICULTURAL SCIENCE

Topic: Examples of Harmful Insects

Class: BASIC 1

Hello, young farmers!

Today, we will learn about some tiny creatures called insects. We know some insects are good for our farms, but others can be very harmful. "Harmful" means they can spoil our plants and the food we grow. Let's find out which insects are not our friends in the farm!

Core Concepts: What are Harmful Insects?

Harmful insects are like tiny enemies to our plants. They eat parts of the plants, drink their juice, or even spoil our stored food. When they do this, the plants get sick, and we might not get enough food to eat.

1. Locusts (Grasshoppers)

• What they look like: They are like big grasshoppers, usually green or brown. They can jump and fly very far.
• How they are harmful: Locusts eat leaves and stems very quickly. A big group of locusts can eat all the leaves in a farm in just one day! They leave plants bare and destroyed.

2. Aphids

• What they look like: Aphids are tiny, soft insects. They can be green, black, or even yellow. You often find them on the underside of leaves or on new shoots.
• How they are harmful: Aphids use their tiny mouths to drink the sweet juice (sap) from plant leaves and stems. When they do this, the plants become weak and cannot grow well. The leaves might curl up or turn yellow.

3. Caterpillars

• What they look like: Caterpillars are the baby forms of butterflies and moths. They are often long, worm-like, and can be green, striped, or hairy.
• How they are harmful: Caterpillars love to eat leaves! They chew big holes in leaves, sometimes eating a whole leaf until only the veins are left. This stops the plant from making its food properly.

4. Weevils

• What they look like: Weevils are small beetles, often dark brown or black. They have a long snout (nose) at the front of their heads.
• How they are harmful: Weevils are very harmful to our stored food like maize, beans, and rice. They bore holes into the grains and eat them from the inside. This spoils our food and makes it unfit to eat.

5. Termites (White Ants)

• What they look like: Termites are small, pale-bodied insects, sometimes called "white ants." They live in big colonies inside the soil or in mounds.
• How they are harmful: Termites eat wood and can also eat the roots of living plants, especially young trees and crops. When they eat the roots, the plant cannot get water and nutrients from the soil, making it wilt and die.

Real-World Example

Imagine a farmer who planted a field of maize. One morning, he noticed many caterpillars on his maize plants. They were eating the leaves so fast! If the farmer doesn't remove them, his maize plants will become weak, and he won't have much maize to harvest for food or to sell.

Practice/Reflection Question

Can you think of any other tiny creatures you have seen that might be eating plants in your garden or around your house?

Home Practice Idea

With an adult, carefully look at some leaves in your compound. Can you see any small holes or tiny insects drinking sap? Remember not to touch unknown insects!