Human beings on this planet may not have a choice about the dominant form of agriculture that feeds us. 6 billion people are difficult to feed with anything other than industrial style, monoculture agricultural processes.
But one of the weaknesses of planting acres of the same plant is that a single pathogen can wipe out large fields of crops in a very short time. The weakness of spraying with chemicals to suppress pathogens is too obvious to discuss. The natural and low cost solution is multiple crop plantings, but you don’t see much of that from industrial agriculture.
We face several threats to the world’s food supply. One is a push to turn a food supply into a fuel supply in the form of biofuels, another is the possibility of monoculture crop failure from new resistant forms of crop pathogens. This report from Kenya covers a resurgence of an old threat to wheat crops: stem rust. For more information on stem rust, try this site.
There is strength in diversity. This is a biological truth.