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PESTICIDES

PESTICIDES. CHAPTER 2.2 . Parachuting Cats Into Borneo. What happened in Borneo in 1950's?. 1.DDT an insecticide was used in Borneo to kill mosquitoes that carried malaria.

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PESTICIDES

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  1. PESTICIDES CHAPTER 2.2

  2. Parachuting Cats Into Borneo

  3. What happened in Borneo in 1950's? • 1.DDT an insecticide was used in Borneo to kill mosquitoes that carried malaria. • 2.The use of DDT resulted in the thatch roofs collapsing! The DDT was killing a parasitic wasp that ate the thatch eating caterpillars. Without the wasps the caterpillars thrived and roofs began to fall in!

  4. 3. DDT also killed cockroaches, lizards and cats. • 4. Because the cats were dead rats started to move in from the forest, carry bacteria than caused the plague. • 5. Cats were parachuted in to control the rat population.

  5. What is a pesticide? • Pesticides are chemicals that kill pests.

  6. What is a pest? • A pest is an organism that people consider harmful or inconvenient, such as weeds, insects, fungi, and rodents.

  7. Types of Pesticides: • 1. Insecticides – kill insects e.g. DDT • 2. Herbicides – kill plants e.g. roundup • 3. Fungicides – kill molds, mildew, rust. e.g. Captan • 4. Bactericide – kills bacteria e.g. Penicillin (antibiotic) • 5. Rodent Killer – kills mice and rats e.g. warfarin

  8. What is Bioaccumulation? • It is the accumulation of substances, such as pesticides, or other organic chemicals in an organism. • They accumulate faster than they are eliminated.

  9. What is bioamplification?Also known as biomagnification! • Is the increase in concentration of a substance, such as a pesticide like DDT, in the food chain.

  10. THINGS TO DO: • Read Chapter 2.2 • Page 52-57 • Fill in the worksheet • 40 MINUTES TO COMPLETE • Check answers before the end of class

  11. ANSWERS TO WORKSHEET • QUESTION 1 – Define the following: • A) Pest – is an organism that people consider harmful or inconvenient • Examples: • Weeds, insects, fungi, and rodents • B) Pesticide – chemicals designed to kill pests • Examples: Raid , DDT

  12. QUESTION 2 – Complete the table on the advantages and disadvantages of pesticide use:

  13. QUESTION 3 – What is the main difference between first generation and second generation pesticides? • 1st Generation – natural chemicals • 2nd Generation – made in Laboratory

  14. QUESTION 4 – Complete the table on the types of pesticides:

  15. QUESTION 5 – Clearly explain BIOAMPLIFICATION • Is the increasing concentration of a toxin, in the fatty tissue, as organisms consume each other.

  16. QUESTION 5 B) – Provide an example of how Bioamplification occurs • Page 54, Figure 4 provides a good example • 1 part per Grasshopper 4 part per Shrew 12 parts per Owl

  17. QUESTION 5 C) – What can be done to prevent Bioamplification? • Make pesticides that do not stay in the fat tissue • Make pesticides that can be extracted from your body thru urination.

  18. QUESTION 6 – Reflect and Answer Parts L-P on pages 56-57 • L) Spruce budworms have become resistant to the pesticides available. If all of the pests are not wiped out in the first wave, the survivors can multiply in number. • M) Concentrations of pesticide sufficiently high to kill all the spruce budworms would also kill many other species, beneficial as well as harmful, insects as well as other organisms.

  19. N) The loggers and lumber and paper-mill workers have benefited from the New Brunswick spraying program. • O) The loggers, lumber and paper-mill workers, and First Nations peoples depending on the forests for a livelihood, might have lost out as a result of the decision not to spray on Cape Breton Island.

  20. P) Not spraying on Cape Breton Island has allowed the ecosystem to adjust and naturally recover from the spruce budworm infestation.

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