Modern farming uses more water gas and chemicals

Modern farming uses more… …water, gas, and chemicals. What are these chemicals?

Pests and Pesticides 15. 2 b

Pests n Any organism that is found where and when it’s not wanted n TRUE or FALSE? – All pests are insects. – All insects are pests. – Only 1 out of 8 insects is a pest; many are beneficial

Pest Photo Challenge n Find an example of the pest in the courtyard that matches your slip of paper n Take a picture (or collect) n Show me and get a new pest to look for Who can find the most pests in 10 minutes?

Pesticide – anything that kills pests n Insecticides n Herbicides n Fungicides n Rodenticides

Types of pesticides n Chemical – Raid, DDT, Round-up n Biological – Ladybugs, wasps n Devices – Mousetrap, blacklight trap

Why use Chemical Pesticides? n Benefits n Risks

Concerns with using Chemical pesticides n Biomagnification n Developing n Human and Persistence resistance and animal health – DDT and bald eagles – eating produce

Biomagnification Game n If you have a… – Small cup = small fish – Medium cup = large fish – Large cup = bald eagle n Rules: – Speed walking = swimming/flying – Once you’re tagged, you will transfer the contents of your cup to each other. – You must tag more than one person in order to survive.

Analysis Questions Draw a food chain to include the plankton, small fish, large fish, and bald eagle. 2. Who ends up with the highest concentration of pesticide? 3. Why? 4. How is this different from the 10% rule for energy transfer? 1.

Biomagnification n Pesticide concentration increases as you go up the food chain n Persistent pesticides don’t break down (go away) quickly

DDT Persistence and Biomagnification Banned in 1972, but still found in 96% of samples Used extensively in WWII http: //www. youtube. com/watch? v=GIx. Mv. UZVRDE - DDT swimming pools http: //www. youtube. com/watch? v=6 g 7 Gdr. Zo. Nh. A – spray trucks (0: 20) http: //www. youtube. com/watch? v=z 7 Lr 1 p. CEc. NU – chlordane persistent (1: 44) http: //www. youtube. com/watch? v=6 Y-6 hm 7 zpps – Rachel Carson (0: 36) http: // Thin eagle shells

Pesticides and ADHD

What is this graph saying?

Developing Pesticide Resistance

Alternatives to chemicals Biological Pesticides And Changing Farming Practices

Pathogens - bacteria, protozoa, fungus

Chemicals from plants

Release predatory organisms http: //www. youtube. com/watch? v=v. MG-LWy. Nc. As

Prevent Breeding / Birth Control

Plant companion crops

Integrated Pest Management includes. . . 1. Biological pest control 2. Mix of farming practices 3. Chemical pesticides If IPM is common sense, why doesn’t everyone use it?

Steps of IPM 1. INSPECT AND INVESTIGATE 2. IDENTIFY AND LEARN 3. MONITOR 4. IS IT WORTH IT? 5. CHOOSE CONTROL METHODS 6. EVALUATE

Engineering Crops Selective breeding and Genetic Engineering

What is selective breeding?

What do these foods have in common? Freeze resistant tomatoes Bt Corn Round-up ready soybeans Fast Growing Salmon Extra oil producing canola plant

How genetic engineering works… n http: //www. cfs. gov. hk/english/programm e/programme_gmf_er_ res 2. html n http: //www. pbs. org/wgbh/harvest/engine er/transgen. html

GMO’s (Read pg. 436 -437) n Advantages n Disadvantages

GMO Freewrite n When it’s your time to buy groceries for yourself, will you buy GM (genetically modified) foods? Why or why not? n Do you think it should be a law that they’re labeled?

Sustainable agriculture n Define n Plant sustainable pest-resistant crops n Plant crops that require little fertilizer, pesticide, or water n Plant NATIVE crops!