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Entomology

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the branch of zoology that deals with the study of insects. On average there are more than 750,000 species of insects that have been identified worldwide. ... – PowerPoint PPT presentation

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Title: Entomology


1
Entomology
Original PowerPoint by Mark Morgan Modified by
Georgia Agriculture Education Curriculum
Office November 2005
2
  • What is Entomology?
  • the branch of zoology that deals with the study
    of insects

3
  • On average there are more than 750,000 species
    of insects that have been identified worldwide.

4
  • There are only approximately 10,000 species of
    insects that are harmful to humans.

5
Problems
  • Deadly epidemics of the past have been caused by
    diseased organisms carried by insects.
  • Example Bubonic Plague epidemic that wiped out
    the population of Europe in the 14 century was
    carried by fleas that infested rodents

6
Classification of insects
  • Kingdom
  • Phyla
  • Class
  • Order
  • Family
  • Genus
  • Species

7
  • The highest level is the Kingdom
  • The most specific is the species level.
  • Organisms are usually classified by the genus and
    species.
  • This is called a binomial nomenclature.

8
Six orders of insects
  • Orthoptera- which includes the grasshopper and
    locust
  • Hemiptera- which includes the true bugs such as
    leaf hoppers and plant bugs
  • Lepidoptera moths and butterflies
  • Homoptera- aphids

9
Contd
  • Thysanoptera- thrips
  • Coleoptera- which is the largest group of the
    insect orders this has beetles

10
How are insects grouped?
  • by the way they feed on plants
  • by their mouth parts

11
Six Mouth Parts
  • Sponging
  • Rasping- sucking
  • Siphoning
  • Chewing-lapping
  • Chewing
  • Piercing- sucking

12
  • Insects have no internal skeleton and they rely
    on their hard outer coating, exoskeleton, which
    protects their inner organs and supports their
    body.

13
Parts of an Insect
  • Head
  • Thorax
  • Abdomen

14
Head
  • Has a pair of compound eye and two sensory
    appendages called antennae

15
Thorax
  • is divided into three segments from which are
    attached three pairs of legs

16
Abdomen
  • is attached to the thorax
  • which will contain more segments

17
Life Cycles
  • Incomplete Metamorphosis
  • Complete Metamorphosis

18
Incomplete Metamorphosis
  • Eggs
  • to Early nymph (no wings)
  • to late nymph (wings developing)
  • Goes to Adult

19
Complete Metamorphosis
  • Eggs to
  • Larva to
  • Pupa to
  • Adult

20
What Is a Larva?
  • It is when the young insect has soft tubular body
    and looks very much like a worm

21
What Is the Pupa Stage?
  • The larva matures and will pass through the pupa
    stages which is usually a relatively dormant
    stage.

22
What is DDT?
  • This is a chemical that was discovered by German
    name Othmar Zeidler in 1874.
  • It is a chemical used to reduce the number of
    insects in a given area.
  • Example mosquitoes in the tropics

23
Integrated Pest Management
  • Cultural methods
  • Insect diseases and predators
  • Pheromones
  • Release of sterile males
  • Insect resistant plants varieties
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