1. Entomology Modified by Georgia Agricultural Education Curriculum Office July 2002

2. Entomology What is Entomology? What is Entomology? Entomology is the study of insects. Insects are always around us. Scientists called entomologist spend most of their time studying insects. Entomology is the study of insects. Insects are always around us. Scientists called entomologist spend most of their time studying insects.

3. Entomology What is the average amount of insects that are on the earth’s surface? What is the average amount of insects that are on the earth’s surface? More than 750,000 species of insects have been identified. More than 750,000 species of insects have been identified.

4. Entomology Are all insects harmful to humans? Are all insects harmful to humans? No. Only about 10,000 are harmful to humans. No. Only about 10,000 are harmful to humans.

5. Entomology Classification of insects: Classification of insects: Different levels of classifying insects: Different levels of classifying insects: –Kingdom –Phyla –Class –Order –Family –Genus –Species

6. Entomology The highest classification level is the kingdom. The highest classification level is the kingdom. The most specific classification is the species level. The most specific classification is the species level. Organisms are classified by genus and species. Organisms are classified by genus and species. This is called a binomial nomenclature. This is called a binomial nomenclature.

7. Entomology Six orders of insects: Six orders of insects: Orthoptera - grasshopper and locust Orthoptera - grasshopper and locust Hemiptera -leaf hoppers and plant bugs Hemiptera -leaf hoppers and plant bugs Lepidoptera – moths and butterflies Lepidoptera – moths and butterflies Homoptera - aphids Homoptera - aphids

8. Entomology Cont… Cont… Thysanoptera - thrips Thysanoptera - thrips Coleoptera - beetles (the largest group of the insect orders) Coleoptera - beetles (the largest group of the insect orders)

9. Entomology How are insects grouped? How are insects grouped? Insects are grouped by their mouth parts. Insects are grouped by their mouth parts.

10. Entomology Six different mouth parts Six different mouth parts Sponging Sponging Rasping- sucking Rasping- sucking Siphoning Siphoning Chewing-lapping Chewing-lapping Chewing Chewing Piercing- sucking Piercing- sucking

11. Entomology Insects have no internal skeleton. They rely on a hard outer coating called exoskeleton to protect the inner organs and support the body. Insects have no internal skeleton. They rely on a hard outer coating called exoskeleton to protect the inner organs and support the body.

12. Entomology What are the parts of an insect? What are the parts of an insect? Three parts to an insect Three parts to an insect Head Head Thorax Thorax Abdomen Abdomen

13. Entomology Head Head The head has a pair of compound eyes and two sensory appendages called antennae. The head has a pair of compound eyes and two sensory appendages called antennae.

14. Entomology Thorax Thorax The thorax is divided into three segments. Three pairs of legs are attached to the thorax. The thorax is divided into three segments. Three pairs of legs are attached to the thorax.

15. Entomology Abdomen Abdomen The abdomen is attached to the thorax. The abdomen is attached to the thorax.

16. Entomology Insects will complete one of three different life cycles. Insects will complete one of three different life cycles. No Metamorphosis - no change No Metamorphosis - no change Incomplete Metamorphosis - gradual change Incomplete Metamorphosis - gradual change Complete Metamorphosis - complete change Complete Metamorphosis - complete change

17. Entomology Incomplete Metamorphosis Incomplete Metamorphosis Egg Egg Early nymph (no wings) Early nymph (no wings) Late nymph (wings developing) Late nymph (wings developing) Adult Adult

18. Entomology Complete Metamorphosis Complete Metamorphosis Egg Egg Larva Larva Pupa Pupa Adult Adult

19. Entomology What is a larva? What is a larva? A larva is a young insect with a soft tubular body and looks very much like a worm. A larva is a young insect with a soft tubular body and looks very much like a worm.

20. Entomology What is a pupa? What is a pupa? The pupa stage is a dormant stage where the larva changes into an adult. The pupa stage is a dormant stage where the larva changes into an adult.

21. Entomology What are Phytophagous insects? What are Phytophagous insects? Phyto means plant and phagous means eating. Whenever a plant is eaten, it is damaged in terms of growth and productivity. Phyto means plant and phagous means eating. Whenever a plant is eaten, it is damaged in terms of growth and productivity.