Disease-resistant varieties refer to plant breeds that have been developed to withstand specific diseases caused by pathogens like bacteria, fungi, and viruses. These varieties are often created through selective breeding or genetic modification, aiming to reduce the need for chemical treatments and improve crop yields. By enhancing the natural defenses of plants, farmers can cultivate healthier crops that are less susceptible to disease outbreaks. The development of disease-resistant varieties is crucial for sustainable agriculture, as it helps ensure food security and reduces the environmental impact of farming. For example, wheat, corn, and soybeans have all seen advancements in disease resistance, allowing farmers to produce more resilient crops that can thrive in various conditions while minimizing losses due to disease.