Which of the following is a viable long-term control method for plant viruses?

The option that highlights plant testing and disease resistance as a viable long-term control method for plant viruses is based on the understanding that certain plants can exhibit inherent resistance to specific viral infections. By selecting and breeding plant varieties that are resistant to prevalent viruses, growers can significantly reduce the incidence and spread of these diseases in their crops over time.

Plant testing plays a critical role in identifying varieties that either naturally resist viral infections or have been genetically modified to do so. By implementing these resistant varieties, farmers can effectively manage and mitigate the impact of viruses in their fields, leading to healthier crops and potentially higher yields, while also reducing the reliance on chemical treatments.

Resistance breeding not only offers effective management of virus diseases but also adds sustainability to agricultural practices, as it minimizes the need for interventions like pesticides, thereby reducing environmental impact. This method contrasts sharply with the alternatives, which may perpetuate problems rather than address the root causes of viral infections in plants.