Transcript Entomology
Entomology Original PowerPoint by Mark Morgan Modified by Georgia Agriculture Education Curriculum Office 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