What is the primary purpose of Streptomycin?

The primary purpose of Streptomycin is as an antibiotic used on beans and other plants to combat bacterial diseases. It is particularly effective against certain bacterial infections that can be detrimental to plant health, such as bacterial blight in beans. By applying Streptomycin, growers can protect their crops from these diseases, thereby improving yield and quality.

This choice aligns well with Streptomycin's known usage in agricultural practices, where it serves as a critical tool for managing bacterial pathogens. Its effectiveness in treating bacterial infections highlights its essential role in sustaining crop production and ensuring plant health. Other options relate to different aspects of agricultural management, but they do not specifically address the antibiotic properties and applications of Streptomycin.