Agricultural Science

Prevention and Control of Crop Pests

len Alfred Ajibola - Tue, 10th March, 2020 @ 12:31: PM

Topics in Agricultural Science

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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



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Prevention and Control of Pest:

Prevention of crop pest refers to the various steps taken to keep crops intact (when they are yet to be attacked by pests). They are therefore done to prevent pests from acting on crops and other agricultural produce.

The control of crop pest refers to the various actions taken by the farmer to minimize or stop the actions of pests (already acting) on agricultural produce.

Please read on the Agricultural Pests and the Crops they attack here.

Crop pests can be prevented and controlled through a variety of methods. These are:

1. Physical Control

This process involves the physical or mechanical removal of pest from an agricultural land via various techniques such as:

  • Hand picking.
  • Setting of traps to catch rats and rodents.
  • Fencing the farmland.
  • Use of guns to kill monkeys.
  • Contaminating food with poisons to kill certain pest; for instance, rodents.

Please read on Agricultural Tools and their Uses here.

2. Biological Control

This method of pest control require the use of animals (or other organisms) that act as a natural enemy to pest. By nature, these animals enjoy eliminating pest. The animals used in biological control of pests typically act as a predator, parasitoid or pathogen to the appropriate pest.

You can read on Amazing Facts in Biology here.

Below are some examples of the biological control of pests:

  • Placing hen in a farmland to eat insects. The hen acts as a predator to various insects. (Crops planted on the farmland should not be a meal to the hen, for example, maize).
  • Putting parasitic wasps on a farmland to infect aphids and their eggs. They also infect and kill caterpillar worms, clearwing moth larvae, elm leaf beetle, giant whitefly, mealybugs and lace bugs.
  • The proliferation of the European rabbit (a pest in Australia) can be controlled by introduction of myxoma virus. The virus causes a disease termed myxomatosis to the rabbits, ultimately leading to their deaths.
    Please read on various Agricultural Terms and Meanings here.

Note: Any new method to be implemented in the biological control of pest must be carefully analysed and considered before they are released into the environment. This is done to prevent an attack on useful and other harmless organisms within the environment.

Please read on the Economic Importance of Crop Pests here.

3. Chemical Control

Chemical control of pest involves the use of toxic substances (chemicals) to eliminate pest within an environment. Such toxic substances or chemicals are generally referred to as pesticides. The pesticides can take different forms; (That is; they can exist in liquid, powdered, granular or gaseous forms).

Please read on Agricultural Pest and Crops Attacked here.

In summary, chemical control of pest involves the use of:

  • Pesticides: A chemical generally used to kill pests.
  • Insecticides: A chemical that kills insect.
  • Fungicides: A chemical that kills fungi.
  • Avicides: A chemical used for killing birds.
  • Rodenticides: A chemical used for killing rodents.
  • Nematicides: A chemical that kills nematode.

4. Cultural Control

Cultural control of pest is a method that requires the application of various farm practices to control pest. The application of these farm practices functions to interrupt the life cycle of the pest; thus significantly decreasing their proliferation on agricultural land.

You can read on Agricultural Land and its Uses here.

The various farm practices that interrupts the life cycle of pests include:

  • Crop rotation
  • Bush fallowing
  • Regular weeding
  • Use of disease resistant seeds
  • Strategic planting dates
  • Timely harvesting

Please read on the Differences between Plants and Crops 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