Entomology Original PowerPoint by Mark Morgan Modified by Georgia Agriculture Education Curriculum Office November 2005
What is Entomology? • 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.
There are only approximately 10,000 species of insects that are harmful to humans.
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
Classification of insects: • Kingdom • Phyla • Class • Order • Family • Genus • Species
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.
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
Cont’d… • Thysanoptera- thrips • Coleoptera- which is the largest group of the insect orders this has beetles
How are insects grouped? • by the way they feed on plants • by their mouth parts
Six Mouth Parts • Sponging • Rasping- sucking • Siphoning • Chewing-lapping • Chewing • Piercing- sucking
Insects have no internal skeleton and they rely on their hard outer coating, exoskeleton, which protects their inner organs and supports their body.
Parts of an Insect • Head • Thorax • Abdomen
Head • Has a pair of compound eye and two sensory appendages called antennae
Thorax • is divided into three segments from which are attached three pairs of legs
Abdomen • is attached to the thorax • which will contain more segments
Life Cycles • Incomplete Metamorphosis • Complete Metamorphosis
Incomplete Metamorphosis • Eggs • to Early nymph (no wings) • to late nymph (wings developing) • Goes to Adult
Complete Metamorphosis • Eggs to • Larva to • Pupa to • Adult
What Is a Larva? • It is when the young insect has soft tubular body and looks very much like a worm
What Is the Pupa Stage? • The larva matures and will pass through the pupa stages which is usually a relatively dormant stage.
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
Integrated Pest Management • Cultural methods • Insect diseases and predators • Pheromones • Release of sterile males • Insect resistant plants varieties