What is a primary reason for applying protectant fungicides repeatedly during a fungal disease period?

Applying protectant fungicides repeatedly during a fungal disease period primarily serves the purpose of protecting the plant, especially the new growth, from infection. Fungal diseases can spread rapidly and are particularly effective at attacking young, tender tissues that are susceptible to infection. As the plant grows, it produces new leaves, stems, and other tissues that can be vulnerable to pathogens. Repeated applications of fungicides ensure that these new growth areas are adequately protected, effectively creating a barrier against fungal spores and infection.

The focus on new plant growth highlights the importance of timing and coverage in managing fungal diseases. A single application may not provide extended protection as new growth continues to emerge, which means that the potential for disease development remains. By consistently applying the fungicide, there is a greater likelihood of preventing fungal diseases from establishing and spreading on the plant.

While there may be other considerations in a broader plant health and disease management strategy, the repeated application aimed specifically at new growth underscores the proactive approach needed to maintain plant health and mitigate the effects of fungal diseases.