The 1970 Southern leaf blight wide-spread epidemic was blamed on which of the following?

Question

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The 1970 Southern leaf blight epidemic was caused by the use of disease-susceptible male-sterile lines in corn breeding programs. These lines were highly susceptible to the disease, which then spread rapidly throughout the corn fields. This epidemic led to significant yield losses and ultimately changed the way in which corn breeders developed new varieties.

The 1970 Southern Leaf Blight Wide-Spread Epidemic Was Blamed on Which