How many diseases are known to attack crops of economic importance in the U.S.?

The correct answer indicates that over 30,000 diseases are known to affect crops of economic importance in the United States. This vast number reflects the complexity and variety of pathogens—such as fungi, bacteria, viruses, and nematodes—that can target agricultural plants. Each of these diseases can have a significant impact on crop yield, quality, and overall agricultural productivity, thereby affecting food supply and economic stability. Understanding this substantial figure is crucial for horticulturists, farmers, and agricultural professionals, as it underscores the importance of disease management and biosecurity measures in safeguarding crops. This knowledge encourages the development of resistant plant varieties, integrated pest management practices, and ongoing research in plant pathology to mitigate losses in agricultural production.