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Insect Identification for ND Agronomy: Life Cycle, Economic Impact, & Mouth Parts

Explore the life cycle and economic impact of various insects, from larva to adult stage, and learn about their mouth parts. Understand the importance of insect identification to ensure crop health. Discover key insect orders and their characteristics.

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Insect Identification for ND Agronomy: Life Cycle, Economic Impact, & Mouth Parts

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  1. Insect Identification for ND Agronomy CDE Insect Identification, Life Cycle, Economic Impact, and Mouth Parts Authored by: Seneca HS, AR Adapted by: Jeff Stachler

  2. What do you need to know? • Life Cycle • Complete • Egg, larva, nymph, adult • Each stage is uniquely different • Incomplete • Egg, nymph, adult • Gradual change with young looking similar to adult • None

  3. Are all specimens in the Insect Identification Section insects?? Kingdom (Animal) Phylum (Arthropoda) Class (Hexapoda / Insecta) Order (Hymenoptera) ?? Family (Apidae) Genus (Apis) Species (mellifera)

  4. Arthropod Classification • Classes (2) • Arachnida • Mites, Spiders, ticks, scorpians, other related • Hexapoda (Insecta) • Insects

  5. Arachnida • Bodies: two distinct regions • cephalothorax • abdomen • Legs: Four pairs attached to cephalothorax • Other: Lack wings and antennae • Order: Acari • Specimen: Spider mite

  6. Spider Mite

  7. Spider Mite • Life Cycle: Incomplete • Economic Impact: Removal of plant fluids • Mouth Part: • Piercing-sucking

  8. Class Hexapoda (Insecta) Insect Characteristics • Most adult insects have the following characteristics: • A body divided into three parts (head, thorax and abdomen) • Three pairs of legs • Usually one pair of antennae and a pair of compound eyes (a few exceptions to these characteristics are found) • Usually two pairs of wings (absent in many insects such as lice, fleas, ants; flies have one pair of wings)

  9. Photo of Insect Parts

  10. Orders • Orthoptera • Crickets, grasshoppers • Hemiptera • “true” bugs, aphids • Thysanoptera • Thrips • Neuroptera • Lacewing

  11. Orders • Coleoptera • Beetles, weevils • Diptura • Flies • Lepidoptora • Moths, Butterflies • Hymenoptora • Bees

  12. Alfalfa Weevil Larva stage

  13. Alfalfa Weevil • Life Cycle: Complete • Economic Impact: Destruction of Vegetative Parts

  14. Aphid

  15. Aphids • Life Cycle: Incomplete • Economic Impact: Destruction by removal of plant fluids

  16. Armyworm Larva

  17. Armyworm Larva • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts

  18. Bean Leaf Beetle

  19. Bean Leaf Beetle • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts

  20. Blister Beetle

  21. Blister Beetle • Life Cycle: Complete • Economic Impact: Destruction of fruit/flower • Destruction of vegetative parts

  22. Corn Earworm Larva

  23. Corn Earworm Larva • Life Cycle: Complete • Economic Impact: Destruction of fruit/flower

  24. Corn Rootworm Larva

  25. Corn Rootworm Larva • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts

  26. Cricket

  27. Cricket • Life Cycle: Incomplete • Economic Impact: Destruction of vegetative parts • None or predatory • Destruction of indoor fibers

  28. Cutworm Larva

  29. Cutworm Larva • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts • Destruction of fruit/flower

  30. European Corn Borer Larva

  31. European Corn Borer Larva • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts • Destruction of fruit/flower

  32. Flea Beetle

  33. Flea Beetle • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts

  34. Grain Weevil

  35. Grain Weevil • Life Cycle: Complete • Economic Impact: Destruction of fruit/flower

  36. Grasshopper

  37. Grasshopper • Life Cycle: Incomplete • Economic Impact: Destruction of vegetative parts • Destruction of fruit/flower

  38. Green Lacewing

  39. Green Lacewing • Life Cycle: Complete • Economical Impact: Adult: Feed on pollen, plant nectar, and aphid honeydew • Larva: None or predatory

  40. Honeybee

  41. Honeybee • Life Cycle: Complete • Economic Impact: None or predatory

  42. Japanese Beetle

  43. Japanese Beetle • Life Cycle: Complete • Economic Impact: Destruction of vegetative parts • Destruction of fruit/flower

  44. Lady Beetle Larva

  45. Lady Beetle Larva • Life Cycle: Complete • Economic Impact: None or Predatory

  46. Leafhopper

  47. Leafhopper • Life Cycle: Incomplete • Economic Impact: Destruction by removal of plant fluids

  48. Scale

  49. Scale • Life Cycle: Incomplete • Economic Impact: Destruction by removal of plant fluids

  50. Stinkbug

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