Insects: Damages Caused By Harmful Insects 





Welcome to class!

In today’s class, we will be talking about damages caused by harmful insects. Enjoy the class!


In previous lessons we learnt about farm insects. We learnt that these farm insects can be both beneficial and harmful. Some of their benefits are: production of honey and helping plants to pollinate flowers during reproduction etc.



  1. You and your friend observe a hibiscus flower, take out the green stalk and taste the liquid substance coming out from the flower.              (a) What is the taste of the liquid substance?     (b) What is the name of the liquid substance?

Harmful insects cause great change to our farm crops, animals and even the farmer. Some of this damages are:

  1. They bite and transmit diseases to humans and animals. e.g mosquito and Tsetse fly.
  2. They suck juice from crops, thereby killing the crop. e.g cotton stainer and mealy bugs
  3. They eat up plant root and leaves causing poor growth in plants. For example, beetles and grasshoppers
  4. They feed on and destroy the grains of crop plants e.g weevils.
  5. They make holes into seeds thereby killing the seeds.
  6. They make man and animals uncomfortable when they suck their blood eg.
  7. They reduce the profit that a farmer expects to make when he sells his farm produce.
  8. They reduce market value of crops
  9. They increase the cost of production
  10. They bring about poor quality of farm produce


  1. State five damages done by harmful insects

In our next class, we will be talking about methods of controlling harmful insects . We hope you enjoyed today’s class?

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