The controversy over ddt ddt has rela9vely minor

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Unformatted text preview: pes9cides show marked improvements in several of these categories. We now have pes9cides available that break down rela9vely rapidly and do not accumulate in the environment, such as Bt toxin, derived from the soil bacterium Bacillus thuringiensis that is even one of the few pes9cides allowed in organic farming. Types of Pes9cides •  Pes9cide: any chemical used to kill or control unwanted organisms Problems With Pes9cide Use Problems With Pes9cide Use •  Effects on Non- Target Organisms –  Most pes9cides are not species specific, and kill beneficial species as well as pest species. –  Many kill predator and parasi9c insects that normally control pest insects. CNN Weed killer 'castrates' male frogs, study says By Azadeh Ansari, CNN March 1, 2010 Atrazine, a weed killer widely used in the Midwestern United States and other agricultural areas of the world, can chemically "castrate" male frogs and turn some into females, according to a new study. Researchers found that long- term exposure to low levels of atrazine - - 2.5 parts per billion of water - - emasculated three- quarters of laboratory frogs and turned one in 10 into females. Scien9sts believe the pes9cide interferes with endocrine hormones, such as estrogen and testosterone. Syngenta, a Swiss company that is the largest manufacturer of atrazine, has challenged the validity of the study. The controversy over DDT DDT has rela9vely minor health consequences in humans In humans, large doses result in tremors and...
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