Most rex begonias require at least 50 percent humidity to thrive and good air circulation to prevent mildew.

Manufacturers use formaldehyde to treat clothes that have to be shipped a long way, say, from Asia to the United States, to prevent mildew.

In order to prevent mildew, some farms may introduce methods such as using heaters or incorporating large fans over their crops.

This fall, it bought grapes from a grower who, too close to harvest, had routinely dusted the fruit with sulfur to prevent mildew.

Airing them frequently in plenty of sunlight also helps to prevent mildew.

As the cherries dry, they are raked or turned by hand to ensure even drying and prevent mildew.

An open middle makes picking easier and improves airflow, which helps prevent mildew.

Mildewed cushions should be washed or professionally cleaned, and aired frequently in sunlight to prevent mildew from recurring.

Fewer stems mean larger flowers, and less crowding helps prevent mildew.

The jute padding also helps prevent mildew which was more of a problem in older leaking cars than the modern cars.