Homework Help: science

Posted by joe on Monday, April 26, 2010 at 6:25pm.

after spraying crops with ddt for several years, farmers found that populations of insect pests rebounded. one reason was that insects had developed resistance to the insecticide. suggest another reason, based on what you know about populations, pyramids, predators and competitors

science - SraJMcGin, Monday, April 26, 2010 at 8:38pm
Here are some links on DDT:

http://search.yahoo.com/search?fr=mcafee&p=why+ddt+became+ineffective

Sra

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