Damages caused by harmful insects

Hello, young scientists! Today, we will learn about some tiny creatures that can cause big problems for our plants and food. These are called harmful insects, also known as pests.

Core Concepts

What are Harmful Insects? Harmful insects are small animals that live around us. They are called "harmful" because they spoil our plants, crops, and even the food we keep at home. They can make plants sick or destroy them completely, which means less food for us.

How Harmful Insects Damage Plants

1. Eating Plant Parts: Some insects eat the leaves, stems, or roots of plants. For example, caterpillars munch on leaves, leaving holes. Grasshoppers also eat leaves and young plants. When too many leaves are eaten, the plant cannot make enough food and may die.
2. Sucking Plant Juice: Other insects have special mouths like tiny straws. They use these to suck the juice or sap from plants. Aphids are tiny insects that do this. When they suck the juice, the plant becomes weak, stops growing well, and its leaves may curl or turn yellow.
3. Boring into Plants: Some insects dig holes into fruits, seeds, or stems. For instance, if you see tiny worms inside a fruit, it means an insect has bored into it. This makes the fruit rotten and unfit to eat.
4. Spreading Sickness: Just like people can spread sickness, some insects can carry tiny germs that make plants sick. When these insects feed on a healthy plant, they can pass the sickness to it.

How Harmful Insects Damage Stored Food Harmful insects do not only attack plants in the farm. They can also spoil the food we keep in our homes or stores. Weevils are tiny insects that bore into stored grains like maize, rice, or beans. They eat the inside of the grains, making them hollow and useless. This means less food for us to eat.

Why This is a Problem When harmful insects damage plants and stored food, it causes many problems:

• Less Food: Farmers get less harvest, meaning less food for people to eat.
• Less Money: Farmers earn less money because their crops are damaged.
• Wasted Effort: All the hard work put into planting and caring for crops goes to waste.

Examples of Harmful Insects Some common harmful insects you might see are:

• Caterpillars: They eat plant leaves.
• Grasshoppers: They eat leaves and young plants.
• Aphids: They suck juice from plants.
• Weevils: They spoil stored grains.

Understanding how these insects cause damage helps us to protect our food and plants better.

Real-World Example Have you ever seen a beautiful hibiscus flower plant with many holes in its leaves? A hungry caterpillar might have been having a feast there! Or maybe you've opened a bag of beans and found tiny dark insects inside – those are likely weevils spoiling your food. This shows how these tiny creatures affect our food and plants every day.

Practice/Reflection Question Look at a plant in your compound or a food item in your kitchen. Can you find any small holes or signs that an insect has damaged it? What do you think caused it?