Agricultural Science

Classification of Insect Pests and their Economic Importance

len Alfred Ajibola - Thu, 05th March, 2020 @ 11:45

Topics in Agricultural Science

Importance of forest: Forest reserves in Nigeria Wildlife reserves in Nigeria and its importance Prevention and Control of Crop Pests Economic Importance of Crop Pests Classification of Insect Pests and their Economic Importance Agricultural Machines and their Uses Soil Erosion: Causes of Soil Erosion Ways to prevent Soil Erosion Asexual Propagation in Plants, Types and Examples Differences between Gymnosperms and Angiosperms Scheme of Work, Agricultural Science, SS1, First Term Scheme of Work, Agricultural Science, SS1, Second Term Scheme of Work, Agricultural Science, SS1, Third Term Len Academy Agric Science exam questions, JSS1, First Term Len Academy Agric Science exam questions, JSS1, First Term, part 2 Definitions and Meanings of Agricutural terms (P - Q) Definition and Meanings of Agricultural Terms (P and Q) part 2 Len Academy questions for Agric Science JSS1, 2nd Term Len Academy questions for Agric Science JSS1, 2nd Term, Part 2 Roles of Government in Agriculture

Academic Questions in Agricultural Science

Please check out our Test Your Knowledge page to see all Questions and Answers

Cordage is made from _____ crop.

  • A. Food

  • B. Fibre

  • C. Ornamental

  • D. Oil

  • E. Cash

  • F. Vegetables and Spice

_____ is defined as the solid and arable part of the earth where agricultural activities are be carried out.

  • A. Soil

  • B. Farmland

  • C. Agricultural land

  • D. Biosphere

  • E. Open land

  • F. Planting and grazing land

Gymnosperms and angiosperms are seed bearing plants under the division spermatophyta?

  • A. True

  • B. False

Which of the following is false concerning gymnosperms?

  • A. Cones are present

  • B. Sepals are present

  • C. Petals are absent

  • D. Only seeds are produced

  • E. Sporophyll form the cones

  • F. In seed formation, the ovules aren't present in the ovary

Which of the following statement is incorrect concerning seeds?

  • A. The ovary develops into the seed after fertilization

  • B. The embryo in the seed develops into a young plant

  • C. The seed's endosperm serve as a source of food reserve for the developing embryo

  • D. A seed has its own genotype

  • E. Seeds are products of sexual reproduction

  • F. Apomictic seeds aren't produced sexually and the hawkseed is an example

The _____ is the reproductive organ in plant's sexual reproduction.

  • A. Pollen grain

  • B. Ova

  • C. Sperm

  • D. Flower

  • E. Fruit

  • F. Seed

In flowering plants, fertilization occurs when the _____ comes into contact with the ova (as genetic materials are eventually exchanged).

  • A. Sperm

  • B. Endosperm

  • C. Exosperm

  • D. Stigma

  • E. Ovule

  • F. Pollen grain

The fusion of sperm and ova in animals leads to the formation of _____.

  • A. Foetus

  • B. Embryo

  • C. Ovary

  • D. Neonate

  • E. Zygote

  • F. Egg



Read more on its smart academic features here

Classification of Insect Pests:

An insect pest can simply be defined as any insect capable of causing damage to crop plant.

Please read on the Differences between Plants and Crops here.

It is important to state that we have other organisms that aren't insects (insect pests) but are also capable of causing damage to crop plants. Such organisms include:

Our classification of insect pest will be based on their mode of feeding. These group of insect pests will include:

1. Biting and Chewing Insects

A major characteristic of the biting and chewing insect pest is the possession of mouth-parts such as a strong mandible and maxillae.

You can read on the Skeletal Material (Chitin) which is typically found in Insects here.

The image below shows the mouth parts of a biting and chewing insect:
Mouth parts of biting and chewing insect - Len Academy

Please read on Pest of Agricultural Importance and Crops Attacked here.

Note: The mandibles and maxilla of insect pests are used for biting and chewing plant parts.

Examples of biting and chewing insects include grasshoppers, termites, army worms, locust, beetles, leaf worms and so on.


2. Piercing and Sucking Insects

Piercing and sucking insects possess a strong mouth part called proboscis.

The proboscis is a tiny and elongated mouth-part which enables certain insects to pierce through plants in order to suck the liquid substances from their tissues.

You can read on various Agricultural Terms and Meanings here.

The image below shows the proboscis of a piercing and sucking insect:
Mouth parts of piercing and sucking insect (Proboscis) - Len Academy

Examples of piercing and sucking insects include aphids, cotton strainers, butterflies, mealy-bugs and white flies.


3. Boring Insects

Boring insects will bore or make holes into crop plants. They end up destroying the tissues of plants, fruits and seeds through this process.

Please read more on the Problems of Agriculture in Nigeria here.

Examples of boring insects are stem borers, bean beetles and weevils.


Economic Importance of Insect Pest

Below are some of the economic importance or effects of insect pest in crop production:

  1. They reduce the farmer’s profit.
    You can read on Roles of Government in Agriculture here.
  2. They cause reduction in the viability of stored produce.
  3. Some are vectors of diseases. A vector is an organism that carries and transmits a disease causing organism into another organism (called the host).
    Please read more on Vectors of Diseases here.
  4. They destroy crops through their biting, chewing, boring, sucking and defoliation activities.
  5. While attempting to control them, the cost of production is increased.
    You can read on Agricultural Tools and their Uses here.
  6. They render vegetables and fruits unattractive and unmarketable.
  7. They generally reduce the yield of crops.
  8. They may bring about the death of crop plants.
    You can read on the Characteristics of Living Organisms here.

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 10 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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Amazing facts in Agricultural Science

Peanuts are legumes and not nuts

Although plants neither see nor hear, they can recognize their siblings and even give them preferential treatments

Squirrels do plant more trees (through their actions) than an average human in their lifetime. They often hide their acorns and nuts underground and forget about them

Cows have got the ability to walk up stairs, but not down stairs

A group of cows is called a team, drove or herd.

People just prefer to call them herd

NOTABLE POINTS IN Agricultural Science

Below are some common types of erosion:

  • Water Erosion: It is caused by rainfall and flooding on the topsoil. As a result of water erosion, some layers of the topsoil are lost.

  • Sheet Erosion: When an entire surface of land becomes eroded at a uniform (equal) level, such is referred to as sheet erosion. It is shown below:
    Sheet Erosion - Len Academy

  • Wind Erosion: It results from the actions of wind on a bare land. Wind erosion is often seen in deserts. Overgrazing and lack of vegetation cover will also enhance wind erosion on topsoil.

Please read more on types of soil erosion here.

Soil erosion is defined as a process through which the topsoil is removed or moved from one point to another by agents like wind, water, man and animals.

Soil erosion occurs naturally (wind and water) and may also be facilitated by living organisms.

Soil erosion is more likely to occur on a sloppy land and land with no vegetation cover. When this occurs, the nutrient rich layer of the topsoil is washed away; and this ultimately results in fewer plants growing on such eroded soil.

Please read more on soil erosion here

There are about 630 different kinds of carnivorous plants.

Carnivorous plants are plants that derive some or most of their nutrients by consuming small animals, especially insects.

Carnivorous plants are also referred to as insectivorous plants.

Examples of carnivorous plants include sundew and Venus flytrap.

Please read more on carnivorous plants here