Agricultural Science

Pests of Agricultural importance and Crops Attacked

len Alfred Ajibola - Tue, 19th March, 2019 @ 9:40 PM

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) Agricultural Terms: 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

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What are Pests?

With regards to agriculture, a pest is any organism that can attack plant and agricultural produce, rendering them unsuitable for harvest and unfit for the market.

Please read on the prevention and control of pest here.

Pest can adversely affect a plant's seed, root, stem, leaf and flower thereby largely reducing the overall quality of harvested fruits and vegetables.

Note: Generally, a pest can cause physical damage to humans, animals and crops.

Please read on the problems of agriculture in Nigeria here.


An organism will be considered a pest if it does one of the followings:

  • Attack crop plants and eat it's seeds, roots, stem, leaves and flowers. Examples are locust and grasshoppers.
  • Cause damage to stored food, fruits or other agricultural produce. Some may even urinate or deaficate on these products. Examples are rodents, cockroaches and mice.
    Please read on the economic importance of crop pests here.
  • Attack and kill farm animals like goats, sheep and cattle. Examples are foxes, wild cats and snakes.
  • Act as disease vectors. A vector is an organism that carries parasite and other disease causing organisms, without being affected; but when they introduce the parasites into their host, such host becomes infected with disease. Examples of vectors are rodents and mosquitoes.
    Please read more on vectors of diseases here.

 

Examples of Crop Pest

Below are some examples of crop pests:

1. Insects: Based on their mode of feeding, insect pest can be put into:

2. Rodents

3. Monkeys

4. Birds

5. Nematodes

6. Man

Please read on micro-organisms causing food, water and air Borne Diseases here.

 

Crops attacked by Pests

Below is a summary of crops and the pest that attack them:

  1. Maize: Maize weevils, birds, African black beetles, stem borers, greasy cut worm and army worms.
  2. Cereals: Drugstore beetle, several weevil specie (rice weevil, maize weevil), confused flour beetle, red flour beetle, birds, saw toothed beetle, merchant grain beetle, rodents, several Aphids species and wheat bug.
  3. You can read on the differences between plants and crops here.

  4. Beans: Bean weevil, seedcorn maggots, leafhoppers, aphids and spider mites.
  5. Cotton: Cotton bollworm, plant bugs, cotton strainers, thrips, stink bugs, spider mites and aphids.
  6. Groundnut: Red hairy caterpillar, jassids, aphids, snails, spodoptera and several thrips specie.
  7. Sorghum: Corn earworms, sorghum webworms, sorghum sidge weevils, stink bugs, fall armyworms and aphids.

Note: Cereals include crops like rice, maize or corn, Barley, millet, sorghum and oats.

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 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