What practice can enhance air movement to combat Pythium blight?

Using fans in the area is an effective practice to enhance air movement, which helps to combat Pythium blight. This fungal disease thrives in warm, humid conditions, often exacerbated by stagnant air and excess moisture. By increasing air circulation, fans can help to lower humidity levels on the leaf surface and in the surrounding environment, creating conditions that are less favorable for the development of Pythium blight. Enhanced air movement facilitates quicker drying of foliage and soil, which is crucial since Pythium pathogens flourish in wet conditions.

In contrast, planting trees nearby can create shade and reduce air movement, potentially increasing humidity levels around the plants and contributing to disease development. Watering plants in the afternoon, rather than early morning, can lead to higher moisture retention on the foliage during cooler evening hours, which can also foster conditions conducive to Pythium blight. Covering areas with plastic sheets would trap moisture and heat, creating a very hospitable environment for this pathogen, further intensifying the risk of disease. Thus, using fans is the most effective method among the options considered.