The vulnerability of monocultures was seen in 1970 when a fungal epidemic devastated what u. s. crop?

The vulnerability of monocultures was seen in 1970 when a fungal epidemic devastated Corn crop in the U.S. Monoculture involves producing or growing a single crop, plant or livestock species, variety, or breed in a field or farming system at a time. This type of farming goes against any form of traditional crops and growing food. Reusing the exact same soil, instead of rotating three or four different crops following a pre-determined cycle, can lead to plant pathogens and diseases. 

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