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Using resistant plant varieties is an effective method of controlling the spread of viruses in crops. This approach focuses on breeding or selecting plants that have been specifically developed to withstand or repel certain viral infections. Resistance can be achieved through various means, including genetic modification or traditional breeding techniques, and it offers a sustainable strategy for maintaining healthy crops.

This method helps reduce the potential for disease outbreaks as resistant varieties are less likely to become infected, thus minimizing the need for chemical interventions and lowering the incidence of virus transmission. In contrast, applying fungicides does not address viral infections, as these products are designed to control fungal diseases rather than viruses. Overwatering can create conditions conducive to certain plant diseases, but it does not prevent virus spread. Increased fertilization may enhance plant growth but does not provide any direct protection against viral infections either.