Which practice should not be employed to prevent disease caused by viruses?

Frequent irrigation of affected plants can create an environment that is more conducive to the spread of viral diseases rather than preventing them. Over-watering can lead to waterlogged soils, which may stress plants and make them more susceptible to disease, including viruses. Additionally, excessive moisture can promote the proliferation of potential viral vectors, such as certain insects that thrive in wet environments.

In contrast, controlling insects that can spread diseases is a proactive measure, as many viral pathogens are transmitted by vectors like aphids and whiteflies. Practicing good sanitation, such as removing infected plant debris, helps reduce the risk of viral outbreaks by eliminating potential sources of infection. Avoiding wounding plants is also a preventive tactic, as open wounds can serve as entry points for viral pathogens. Therefore, the act of frequently irrigating affected plants does not align with the best practices for preventing viral diseases.