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Insects: Friend or Foe? Understanding Pest Management and the Benefits of Beneficial Insects

Explore the world of insects and their impact on humans. Learn about the different types of metamorphosis and the benefits of beneficial insects in pest management. Discover the anatomy of insects and techniques for pinning them.

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Insects: Friend or Foe? Understanding Pest Management and the Benefits of Beneficial Insects

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  1. Chapter 13 Pest Management

  2. Insects have successfully adapted to nearly every environment on Earth. There are more species of insects than any other class of organism. Part of their success is due to the large numbers of offspring they can produce and the short time it takes to reach maturity. Other reasons for their success is their anatomy and their developmental diversity. Longhorned beetle

  3. Insects: Friend or Foe • Some insects are very beneficial to humans, while others are devastating. Many insects, neither directly or indirectly, help or hurt humans. Wasp Honey bee

  4. Group discussion • List 5 insects that you feel are beneficial. Be prepared to support your answer.

  5. However An estimated $4 billion per year in crops is lost to harmful insects. Armyworm

  6. Insect Anatomy • Insects have an exoskeleton, which is an exterior body wall. It provides support and protection for the insect.

  7. The insect body is divided into 3 regions: the head, thorax, and abdomen.

  8. Insects have antenna, which are their sensory organs. They have 3 pair of legs, attached to the thorax. Many also have wings.

  9. Mouthparts • Insects have one of four types of mouthparts: chewing, siphoning, sponging, and piercing-sucking.

  10. Development • Insects go through changes as they mature. This process is called metamorphosis.

  11. Types of metamorphosis • There are 4 types of metamorphosis: • 1. Ametabolous – No metamorphosis (adults are wingless) • 2. Hemimetabolous – Incomplete metamorphosis, usually with aquatic nymphs • 3. Paurometabolous – Gradual metamorphosis (nymph & adult live in same habitat • 4. Holometabolous – complete metamorphosis (great differences in form)

  12. Complete Metamorphosis • 4 stages: Egg, Larva, Pupa, Adult Example: The caterpillar >> butterfly -Adults lay eggs, which hatch into larva (caterpillar). The larva is the primary feeding stage. -The larva becomes a pupa (cocoon). The pupa is the sedentary (inactive) stage. -The larva becomes an adult as it comes out of the pupa (cocoon) stage. ---butterfly, bees, wasps, flies, beetles

  13. Incomplete Metamorphosis • Incomplete (Gradual) metamorphosis has 3 stages: egg, nymph, and adult In gradual, or incomplete, metamorphosis, the nymph (immature) organism looks very similar to the adult organism, only smaller. Its development is a gradual increase in size until the final molt, where it will have formed fully developed wings and reproductive organs. Ex: grasshoppers, crickets, cockroaches

  14. https://www.youtube.com/watch?v=W-fK4ESb-vo

  15. How to pin an insect • http://www.youtube.com/watch?v=MT5VGlSCtg4

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