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msvgo
Population Ecology- An Introduction
It describes the role of biological agents for controlling pests. It describes genetically modified organisms (using Bt microbe) and their uses as biocontrol agents.
PBS
Pbs Learning Media: Bt Corn
This video segment from FRONTLINE/NOVA: "Harvest of Fear" looks at corn that has been genetically modified to resist one insect pest and the multiple concerns it raises.